Gen 6 454 heads on gen 5 block. 75" Mains, 4 Bolt Main, Non-Siamesed Bores .

Gen 6 454 heads on gen 5 block Gen 4(old 2 piece rear main) and gen 6 (1 piece) will interchange. I haven't had leaks on any of mine but have heard some castings have. "Some of the 502 BBC's are a "Gen 5" motor. Join Date: Apr 2005. Hello all. I ran Gen 4 heads too, just use the right head gaskets. When I called Edelbrock they told me I needed a special gasket to put the head on the Gen V block (they did not know which gaskets) I talked with Fel-Pro and they say either a 1071 or 1037 will work (1071 has a compressed thickens of . 725" Chamber Volume CC: 99cc Spark Plug Position: Angled Spark Plug Size: 14mm Spark Plug Reach: 0. Did Merc ever use Chevy large oval port 049 heads? 2. I pulled the head bolts one at a time inspected for water, resealed and retorqued. I had a spare Gen 6 crank with cam sprocket on it, so I broke out the depth micrometer and did some measurements. They'll definitely make some steam but will All Gen VI block will accept Mark IV cylinder heads because the water coolant holes were decreased in size. I don't remember the numbers, but that's ok, I think they're out-of-business. I was saving it for a car. You can even trace the contour of the block on the head, lift it off and see how close. Unfortunatley people hear this and that about a certain block, head, etc and believe whatever they hear to be true WITHOUT researching it. Revised GEN V cooling passages mean you either run these or get aftermarket heads. 560 bore easily. Gen V, and Gen VI heads are interchangable. 6500 to 6800 will be the limit on rpm. Now I'm looking for a replacement. 75" Mains, 4 Bolt Main, Non-Siamesed Bores Will accept Mark IV, Gen V or Gen VI cylinder heads; Requires Gen V or Gen VI oil pan & Timing cover; 9. 4L/454 Chevy big block Gen V Cylinder Heads and get Free Shipping on Orders Over $109 at Summit Racing! More Power in Every Purchase - Join the Summit Rewards Program Today! Vehicle/Engine Search Vehicle/Engine Search Make/Model Search There are gaskets made specifically for this swap. I heard there are piston differences from Mk IV to Gen 5/6, too. Registered Gen V and VI Chevy big blocks make motor swaps hard with their standard cooling solutions. Most don't. There are some conflicting theories as to the reason for the change from "Mark" to "Generation". I'm looking into older generation heads, and was wondering Find CHEVROLET 7. The L29 responds well to a small cam, matching valve springs, headers, and a tune. you can bolt aftermarket aluminum heads on it too Early engines were designated as Mark I, (Mk I) Mk II, Mk III, and Mk IV. i have built several of them. Even with the right head gaskets you need to confirm water passage "overlap" with the Gen5 block/MkIV heads. Notes: 454, 4 bolt, Generation V 10114183 Category: Engine Blocks Type: Big Block V8 Date: 1991+ Notes: 366 tall deck, 4 can the gen 5, tbi 454 make power? can it make gen tbi vs tpi, carb vs carb, 230 hp vs 290 hp-who wins? what is the best choice for a junkyard bbc build up? can the gen 5, tbi 454 make power? Find CHEVROLET 7. I think there's a Gen 6 454 which can't go that big. I am sure that everybody has long forgotten about this topic, but I have a special Gen V block. I also have a Mark IV 454 with Gen VI 454 HO pistons so yes the pistons are interchangeable if you use the recommended rings. I have a plan to order a Chevrolet Performance Gen VI 454 HO short block, and mate it to Edelbrock Performer RPM 110cc aluminum heads, and an Edelbrock Air Gap intake. Part Number: EDL-60439. Ok, so my 2000 K2500 454 has spun a main and or rod bearing. com Also,I was told by a Summitracing techy that Sealed Power was the manufacturer for the GM rollers of those years. First is the L-29 Vortec head, great exhaust but intake is lacking. You may--or may not--have problems putting Mk IV heads (366) onto a Gen 5 block. The Mark IV used a four piece oil pan set comprised of two ill fitting neoprene gaskets General Q & A - Gen V heads on a Gen IV block head gasket? - Getting conflicting information on the correct head gasket for 088 heads on a Gen IV bowtie block. I am planning to run an Edelbrock Air Gap and 750-850 carb along with 2200-2600 stall. Since these parts are becoming harder and harder to find. Then the General released the Gen VI big block a few years later with the introduction of the ZZ502 block. The cam is a Gen VI cam I am just worried about lifters and valve springs since it is a zz502 take out I don't know if the 99 lifters and springs will work. 300 longer. as i set the gaskets on the block, i notice it blocks the front coolant hole on the front side of the block. Buy head gaskets to suit the BLOCK--and--give strong consideration to using a General Chevelle Tech Area. In the end this will be a weekend cruiser with maybe one or two trips to the track per year to see what number it runs. It will get a Holley 750cfm double pumper and Hooker headers and 3" exhaust when completed. 800" Deck, 2. , Set. What years did Merc use the 990 rectangular heads and in which hp engines? 3. Gen 6 started 1996,mark 4s require retro rollerts if you want them. 880 Exhaust Valve, Max . I'm looking for +500 hp and don't want to spend more than $1500 if I can. You need the Gen V Gen VI oil pan because your ZZ454 has a one piece rear main seal. Take the head off and check to see how close the tear drops C3 Tech/Performance - Big Block 454 Cylinder Head Question. 600 Valve Size: 2. I had water problems in the oil. Finally got the 454 together. Estimated Ship Date: Today. One is parallel flow and the other series flow, I forget which is which. Performance Gen 4 vs Gen 6 BBC. most people take the 502s to 540. That's why GM redesigned the big block again when the Gen 6 came out (also known as "Gen Fix"). I'd take a Gen VI over a Mark 4 block any day, Dart is probably the best though. I thought the problem was using OLDER heads (Mark IV) on the NEWER Gen 5 block. What would be some good combinations that you guys would recommend. 316 mm Part The Chevrolet big-block engine is a series of large-displacement, naturally-aspirated, 90°, overhead valve, gasoline-powered, V8 engines that was developed and have been produced by the Chevrolet Division of General Find CHEVROLET 7. Stock deck, and a yet undetermined cam. Far as I know, (and I could be wrong) the Gen 6 heads drop onto a The Gen 5 blocks can only use Gen 5 specific heads. General Chevelle Tech Area. "I" would be looking into drilling the three extra holes in the block decks; and using a parallel-flow gasket if possible. Using the newer (Gen 5/6) heads on an older block is no issue provided the head gasket chosen will work with the new head. The Gen 6 was designed to work better with aftermarket and MK IV cylinder heads. Did you not mean to say If you intend to use any other cam than the stock hydraulic cam that came in a MARK V or MARK VI (gen 5 or gen 6 BIG BLOCK CHEVY) you'll most likely want to install one with more lift or duration to increase performance, that means you'll most likely need to upgrade the valve train to an adjustable valve train,IN most cases the use of the conversion studs with Any MkIV head will work on the Gen6 block. 039 compressed. 500 115 Street high performance and marine cam as used in Gen V 454 HO engines went with a Fel pro 1037 gasket, . 4L/454 Fel-Pro Performance Marine Head Set Gaskets and get Free Shipping on Orders Over $109 at Summit Racing! Fel-Pro Performance marine head set gaskets include all I have rebuilt a Gen VI engine using the Speed-Pro flat-top pistons and rods from an earlier Mark IV light duty truck engine (thumb rods as some call them). I'm a newbie to the Gen V motors and What I'm hoping to accomplish is specific head upgrades whether it be aftermarket or factory from a different generation, also discovered viktor reinz doesn't make the gaskets anymore to put mark IV They all work fine, assuming they are assembled correctly. The Mark IV is found on 7. 100 121 . I guess it is possible to get a block/head combination that would work. I was told today that you can use a Gen V head on a Mark IV block (Gen IV), as long as you use the head gaskets for the Mark IV. Save Share Have erson reto roller from Gen 6 block with plate use stock dis gear . I have not sonic tested a Gen 6 454 block, but it wouldn't surprise me to find they can can be bored at least . Still getting water in the oil. With an adapter, you can run a Mark IV crank in a Gen 5/6 block but not the other way around. MSD Yes have to change push rods . good blocks. These cylinder cases all have aluminum front covers with six bolts, Using the newer (Gen 5/6) heads on an older block is no issue provided the head gasket chosen will work with the new head. Top Contributors this Month View All. IV GM heads can not be used on Gen V and VI blocks. 12-31-2005 05:34 PM. 250"-4. Far as I know, (and I could be wrong) the Gen 6 heads drop onto a Gen 5 block as-is. 039 with stainless steel). Now in Gen 6 blocks they changed it, the Gen 5/6 has a one-piece rear main crankshaft seal also. However, YES, you should be able to use the Gen 5/6 heads on the older block by using the proper head gasket for the BLOCK. You have to use late model head gaskets on the Gen5/6 blocks to make sure you cover the huge water passages at the front of the block, on the decks. what i would like to do is put the 396 heads onto the 454 and then put a Gen IV head will fit all of them small water passage head on large water passage block. with the one piece re main seal. 4L Head Gasket Issue: General Motors (GM) 7. bigdogvettes. Mark IV heads often leak coolant when used on Gen 5 blocks--but should be OK on Gen 6 Check machine shops in your area, GM made some Gen 5/6 semi-closed chambers very similar to the old -063/-215 heads. There was a thread about that a month or Chevy corrected this mismatch with the GenVI blocks. In fact, my '73 truck block-based 496 has year 2000 or so cast-iron oval port Merlins on it with the MrG. I am planning to run the 781 Mk IV heads on a . Free Find CHEVROLET 7. Registered . For practical purposes, earlier heads CANNOT be used on Gen 7 I was pulling parts off the 454 today and the whole time I thought it was a Gen 6 block. Already had the heads, both rects and ovals. 4L/454 Chevy big block Gen VI Cylinder Heads and get Free Shipping on Orders Over $109 at Summit Racing! Big Block Chevy Cylinder head, Aluminum, 335cc Rectangle Intake Runner, 122cc Chamber, 2. Victor-Reinz used to make a left and a right (different part numbers!) gasket pair to put Mark IV heads on to a "production" Gen 5 block. Part Number: FEL-17242. If you have ever considered swapping in a big block Chevy engine from 1991 to 2001 into a different platform, you have likely encountered the oil cooler issue. IIRC the Gen VI will accept MK IV heads. Even with Gen V/VI revisions, the 454’s displacement remained constant for decades until GM radically changed the big-block, pushing a production heavy-duty truck engine up to 8. The heads that i pulled off the block were the peanut port heads and I'll be lucky if those things spin up to 3500rpm. There are 4 holes on the top of the Mark IV block and only 2 on the Gen V/VI TC and the 2 on the Gen V/VI TC First Generation Camaro Info and Tech - 1967-1969. 454 Big-Block Budget Engine Build - Initially, I ran a Gen 6 head gasket and it ran hotter than with the Gen 6 heads. L29 will not have a mechanical fuel pump provision. 4L/454 Chevy big block Gen VI Cylinder Heads and get Trick Flow Makes Serious Horsepower! 1-330-630-1555 • 1-888-841-6556. Use other gaskets at you're own risk- these are what you want (from a V/R press release, presumably prior to the Gen 6 engine release): General Motors 7. Everything I read said this is the gasket to use when putting mark IV heads on a gen V. That wouldn’t arrive until the Gen VI big blocks (454 Vortec or 7400 Vortec). plenty strong enough for what you are doing. All production vehicles with a Gen 6 used a 454 version, but over-the-counter 502s are available. Save Share The stock Gen 5-6 replacement pushrods from Comp Cams are Part number 7663-16. Might be able to go back and hit the The gen 5 is not friendly with head interchange. 4L/454 Chevy big block Gen VI Intake Manifolds, Carbureted and get Free Shipping on Orders Over $109 at Summit Racing! Summit Racing SpeedCard - learn how to get 15% back up to $150 Vehicle/Engine Search Vehicle/Engine Search Make/Model Search General Q & A - Gen V heads on a Gen IV block head gasket? MK IV block with Gen 5 heads. 01-20-2017, 11:20 PM #10 endeavor1. SUPPOSEDLY, the casting was "corrected" for the Gen 6 block, which accepts any year head. I actually had a Gen 6 502 block for a few years. General Discussion. They have a large crack now that can't be reliablable repaired. Victor makes a pair of head gaskets for this swap, Found a reasonably priced 454 MAG EFI gen 5 donor motor with a cracked block that I am thinking about purchasing so I can use the heads, intake and ECU with my Gen 6 block. Categories; Contact Us; Help Center; Trick Flow® PowerPort® 320 Cylinder Heads for Big Block Chevrolet TFS-4141B320-M22 Cylinder Head, PowerPort® 320, Fast As Cast®, Bare, 122cc Chamber Anybody running Gen 6 454 blocks with carb or TBI and not using the gen 6 fuel injection (Chevy High Performance, I think) about the Vortec 7. But it still is not listed for a gen 4 head swap. Does anyone know where I can find a set of heads that will flow well enough to make atleast 525hp. You will get water in the lifter valley. Price: $76. If you have a Big Block Chevrolet (BBC) 454 Mark-5 Block, a GM 454 block made in 1991 or later, and plan to use a set of aftermarket BBC heads or older style GM heads that are made for the Mark-4 older style BBC blocks; it is required that you use the correct head gasket to prevent water leaks and catastrophic engine failure. I don't know if you'd need Gen 5 or Gen 6 head gaskets, I have a Gen 6 block and heads, The stroke and rod length the comp. Casting numbers for the heads; 454:4092360 366:473328 I talked to people from Jegs, and from Summit racing but neither could give me an answer. 250 Intake Valve 1. Only Fits Gen 5 or GEN 6 Engines - 4. Vortecpro (user name on several forums) has ported "peanut port" heads and gotten astonishing power from I put Gen 6 heads on a Mark IV block; the head gaskets I chose were not optimum. 4L/454 Chevy big block Gen VI AFR 265cc Oval Port Magnum BBC Cylinder Heads and get Free Shipping on Orders Over $109 at Summit Racing! AFR 265cc Oval Port Magnum BBC cylinder heads are designed to be used on engine displacement up to 468 cu. Don’t have the tools to do a rebuild. Large I have ordered the kit. Thankfully, Hot Rod has a quick fix. 030 over, ARP main & head studs for $450 and friend threw in the nice stand it was on, I took it to a highly rec’d engine builder along with my Mike Lewis Int bal forged rotating assb, main tunnel was out a little so that was straightened, torque plate hones and block was squared, it’s a Find CHEVROLET Chevy big block Gen VI Cylinder Heads and get Free Shipping on Orders Over $109 at Summit Racing! Shop the CLEARANCE SALE! Cylinder Head, Performer RPM 454-O, Aluminum, Assembled, 100cc Chamber, 295cc Intake, Chevy, Big Block, Each. I can't find any information on which components I should use. There were two part numbers, one for left and one for right. PS. its the Before you consider swapping heads, check the block casting number as the Gen 5 blocks are not good for putting MK IV or aftermarket heads on. Location: Lees Summit ~ LOTO The gen6 heads work on a markIV block as well as as a gen 5 block. Chevrolet Performance service replacement cylinder heads are direct replacements on most 1990-and-later GM Big-Block 454-cubic-inch and 502-cubic-inch engines. For big block Chevy 454/502 engines . I am finding contradictory info as to what generation this block is. Changes in the configuration of the "Gen V's coolent transfer passages allows coolant to seep into the lifter valley when the Mark IV head is used. the best part you can do a special cam. 060, 4 bolt mains, installing Gen 4 heads and know the water coolant passage is an issue. General Q & A - gen 6 454 block-1037 gasket question - i am putting mark 4 heads on my gen 6 block. It turned out to be reversion. 4L/454 Chevy big block Gen VI Engine Gasket Sets and get Free Shipping on Orders Over $109 at Summit Racing! Gaskets, Head Set, Marine, Chevy, 454, Gen VI, Except EFI or H. Gen 6 block is a good foundation. The head will work either way. They need the +. If I look at buying a set of Mark IV heads how do I know if there is enough deck All production vehicles with a Gen 6 used a 454 version, but over-the-counter 502s are available. I have Gen 6 (stock Vortec L-29 pickup) heads on my Mark IV block in the boat. ive never had a leak. versions, but never installed in a production vehicle, the 502s were over-the-parts-counter only. 020" thick steel shims Gen V block, get hold of Scoggin Dickie and ask about the copper head gasket washers. operating at or below 6,200 rpm—providing tons of bottom-end torque, tremendous throttle Up for sale is Volvo Penta / MerCruiser Magnum Block Casting 10237297 L29 Gen 6 , 7. The water passages and lifter valley castings were modified for the Mark VI block to be compatable with all Big Block heads. I can't think of any reason the performance heads wouldn't work on a Mark IV block. If you are not using the reluctor for the stock EFI, it works great. IV engines have vary different water passages. An oil filter block off plate kit (#SD3891) can be purchased from Gen 6, 454 Rebuild(long) Thread Stock Vortec heads rebuilt with better springs and 7 1/6 rocker studs. Other upgrades of Vortec 8100 include a new 18-bolt head bolt pattern, longer connecting rods, different symmetrical intake ports, different oil pan rails, and the use of metric threads throughout the engine. The Gen V heads have the non-adjustable valve lash. www. Now, I have not personally messed with gen 6 heads yet, just gen 5. EDIT-Just reread your post. Many of the popular families utilize a positive stop type of rocker arm attachment, which does not allow for any adjustment, and consequently there is no consideration for different cam sizes or other modifications to the engine block and heads For that reason, COMP Cams has designed a kit to convert this setup to a Gaskets, Head Set, Marine, Chevy, 454, Gen VI, Except EFI or H. So while this is a Gen V block, it has a lot of Gen VI corrections. Street friendly pump gas 600 hp roller cam alum heads 30 month 50k mile warranty. I ran gen IV cams in both of mine, just use a cam button. IV heads on a Gen 5 block. For the TC, 4 of the Gen V/VI bolt holes lined up. this is due to a change in the shape of the block at the lifter valley, which if Gen 4 heads are used it will leak antifreeze badly. The other thing to look at is a gen 5 head will fit a gen 6 block, but I am not sure about the coolant passages lining up correctly. Hey I recently purchased a gen 6 454 vortec with roller cam and 4 bolt main. No Issues. I knew the heads would bolt to the block but I had herd the Gen V took a special head gasket but not the Gen VI, so that is what I was trying to find out about the head gaskets. Gen. and. 500 242 . There are three different versions of it, Gen 4, 5, and 6 or Gen IV, V, and VI if you like Roman numerals. So, standard open chamber pistons work. As But almost the same answer - Gen V & Gen VI heads are interchangeable. By contrast, the Mark IV, Gen V and Gen VI big-blocks that pre-dated It is also worth mentioning that the Gen VI heads are a good the junkyard Gen VI 454 produced peak numbers of 378 C3 Tech/Performance - Mark IV heads on a Gen V block - I have heard you can't do it b/c of cooling issues. honestly the gen vi blocks are so much nicer. " And. There were 502 cu. 300 taller lifters. Mark the Machinist Thanks to: Racetech Racing Next question for gen 5/6 10185060 Hydraulic flat I: 220 I: . Gen 5 blocks were from 1991 til 1995. also have the I haven't done Gen 5 heads on Mark IV blocks--but--I did install Gen 6 heads on Mk IV block. Consider the starting point a stock rebuilt Gen6 454 long block. This Fel-Pro Performance Head Gasket Part Number 1012 is for severe duty such as nitrous or turbos, Gen IV pass, car and H/P block, Gen IV truck and Bow tie block, Gen V block, Gen VI block with cast iron or aluminum heads. 041 and mild steel and the 1037 has a compressed thickness of . The Gen 5/6 crank and flexplate/flywheel is not compatable with Mark IV blocks. Don't plan on just adding a different set of heads and gaining a bunch of power, the cam needs to match your application to make it all work First, it's MARK IV (or 4) not gen 4, and there are gaskets made specifically for using Mk. Your Price: $950. My Gen 5 454 is a 4 bolt. AFTER disassembling the engine, I discovered that the Mr. If I can reuse my heads it would save me quite a bit. Gen IV Heads on Gen V Block. There are gaskets made specifically for this swap. 300 198 . Most after market heads are made to fit both with the right head gasket. I've only seen 4 types of Gen 6 heads. I will zero deck the block, that will keep I thought the Gen 6 could use any of the head designs; it was the Gen 5 that needed special gaskets (and a prayer) to use the Mk IV heads. Stock crank, rods, and pistons. You cannot use Mark IV heads on a Gen V Block however. I want to put this in my c3 corvette but don't know much good combos for a rebuild. _____ Like I said earlier, a BBC Mark IV block can use the way early heads like my -206's and . 4L/454 Chevy big block Gen VI Crate Engines V8 Engine Type and get Free Shipping on Orders Over $109 Run the numbers on Mortec. I have a 454 so my gaskets are a smaller bore. 100 over like their predecessors. Some guys are "afraid" of the newer Gen 5 and 6 blocks, but they actually have improved oiling developed by GM. Slip fit (42) 3-bolt flange (35) The oil pan was simple - grafted a Mark IV piece on the rear. 708" I have done it lots of times with gen 5 heads to mark 4 block and the other way around. Pre 1971 blocks may require modification. ALL Gen 5/6 blocks have the holes already. in. 4L/454 Chevy big block Gen VI Cylinder Heads Assembled Cylinder Head Style, Cast aluminum Cylinder Head Material, Oval Intake Port Shape and get Free Shipping on Orders Over $109 at Summit Racing! More Power in Every Purchase - Join the Summit Rewards Program Today! Crate Engine, 350 Base Long Block Crate Engine, 4 Bolt Main, External Balance, Cast Iron Block and Vortec Heads, Harmonic Balancer, Chevy, Each. 25" bore with 4. Hell, no. Free Shipping Find CHEVROLET 7. the guy said that he could weld up some water passage and they would fit, the engine is as of now a 1970 steel crank 454, #512 casting block, 113cc chamber Ovalport heads, torker 2-o intake 850DP carb and headders, Classic Gen 5/6 454 Big Block Chevy VS the 8. 19/1. True Mrk IV heads will not cover the large coolant openings, whereas aftermarket and factory GenV,VI heads will. You are fine with your ProToplines on the GenV. 725 Lift Find CHEVROLET 7. But the 1037 does look like the right one. SOME Mark IV blocks already have the holes. 800 standard deck height; 454 block has mechanical fuel pump provision, 502 block does not The firing order of older big-block engines is 1-8-4-3-6-5-7-2 [63] while Vortec 8100's firing order is 1-8-7-2-6-5-4-3. Log in; Register; Forums. 4918 is for the passenger-side (right) deck. Changes to the Gen 5 as compared to the Mk IV included, but are not limited to: General Q & A - Gen IV Heads on Gen V Block - Has anyone put Gen IV heads on a Gen V block without a water leak problem? ( 454 / 365 hp magnums ) to be identical to the HP-500and topped it off with Gen VI heads. 5. All Gen 6 big block engines have roller cams. Now you have to know about the pistons and whether he needs open or closed chamber heads. 105 thicker. I have also heard you CAN do it with the correct head gasket AND if there is enough deck material to properly seal the head. O. were never roller blocks that would be the gen 6 yours is a gen 5. The last mark 4 year was 1990. If I rember right the gen5 & gen 6 heads are interchangeable between generations, but they will not work on mk4 blocks without coolant passage modifiers. With that said Or I guess you call them Gen 5 and Gen 6. i have the felpro 1037 head gaskets. Cylinder Heads / Big Block Bare Cast-Iron Gen V and Gen VI Cylinder Head; Big Block Bare Cast-Iron Gen V and Gen VI Cylinder Head 12562925. I think they do. Those gaskets are now supplied by Mahle. no problems. Find CHEVROLET 7. i had in mind hanging some higher compression pistons on its ( its a tonowanda with about 9to1) then getting a small solid roller in it and some decent rect port heads. It looks just like a 454MAG MPI on the outside Gen 5: General Motors made substantial revisions to the Mark IV engine, and the result was christened "Gen 5" when it was released for the 1991 model year as a 454. MK IV block with Gen 5 heads. . Gasket steel shim head gaskets were "just barely" sealing a particular coolant passage. 4L/L29 cylinder heads being the "hot tip" for big-blocks the same way the 5. The comp can billet sprocket is . 7L Vortec heads were the "hot tip" for small-blocks. I know they make a 'conversion' gasket to use iron GEN IV heads on GEN V blocks but I do not have info if this is really a good idea For now, limited research, I do believe the 156 is a PP head with revised cooling passages. Blamed the heads at 1st. Having some issues here. The Gen 6 is sometimes referred to as the "Gen Fix" because it fixed a number of issues that disappointed enthusiasts when the Gen 5 was released. The early big-block heads were termed closed chamber (left) that limited valve size but did not require a huge dome to Looking to build a 454 for my 67 what is the best bare 454 gen block to build? I have a set of 049 heads but that is it . (no leaks but hotter) Switched to a Gen 4 gasket and ran cooler again. the one i am running has a ls firing order which runs cooler and smoother. Say you find yourself with a cheap Suburban K2500 with the Vortec 7400. The motor is a 1973 454. The L29 heads you mention are nice heads, too. Jump I prefer to use head studs on a performance GenVI 454, but block has to be plate honed with studs installed. It may be that a different gasket would have more material in that location and would have sealed without question. But it's my understanding they are nearly identical, the exception being that the gen 6 head doesn't have the stupid shaped coolant passages or the tiny ports. 020" thick stock, steel shim head gaskets. Easy way for peace of mind is lay the head you are using on the block and look at the block near cylinders 3,5,4,6. BluePrint Engines 496 Stroker Crate Engine | Big Block Chevy 454 Style | Longblock | Aluminum Heads | Roller Find 1992 CHEVROLET 7. Round (45) SAP (11) Square (3) Rectangular (2) Oval (1) Get Results; Collector Attachment. It’s a Gen 6 block and mark 4 heads (206). GM did this on one show vehicle, it IS possible. A Marine engine builder said that I could use a set of gen 6 The Gen 6 block is considered by many to be a good starting point for a nice street 454, since it comes already set up to support a hydraulic roller camshaft. Somebody markets a kit with slip-in block plugs that addresses the issue, but I couldn't say whether it's General Q & A - Gen 4 heads on a Gen 5 block - I know this has been kicked around a little before, The 17048 is not listed for a 454 bore its for a 502 bore. 88's. Now in Gen 6 blocks they changed it, the water passages still have the tear drop shape but the block has extra material to accomodate all heads, Gen 4,5, and 6. General Q & A - Need to know correct head gasket to run Mk IV head on Gen VI 454, please - I just need a quick answer here - I did a quick search but did not turn up the info I need. If not be too close to seal off. A Gen 6 454 is still a 4. Performance Gen VI 454 cam I recently picked up a second hand gen VI 454 HO for a bargain. They also have more material along the lifter valley. I have Eddy performers on gen 6 454 HO. 540" or 115. Also, keep in mind you must have the extra cooling holes in the Mark IV block to have Parallel Cooling as the 1037 does not allow for Series Cooling which is how the blocks came I have some 396 heads at home that are in good condition. 400 226 . I would expect--but have not verified--that any Gen 6 gasket could be used to install Mk IV heads. First one went to 555, current one is a 540. . 100cc chamber, great compression ratio and good i am running the zz572 engine block which is like the 502 block but has a little extra and is more like a dart block with the main oiling. 00" stroke and 6. Im guessing after surfacing the block the hight would be around 9. Estimated Ship Date: Monday 1/27/2025. I am putting together a Gen VI 454/4L80E combo for my 66 Impala 2 door and am looking for some insight in which direction to go with the heads. Part Number: NAL-19432780. They are very fresh (less than 200 miles) 063's with 2. 030 over Gen VI 454, and I need to know the correct head gasket to use. The issue is the shape of the block, not the shape of the head--and if you aren't using the problem-child (Gen 5) block; you don't have a problem. They block off the water ports on the front of the engine, and open up the rear ports. My first guess: "Gen 5" sounds much more modern, hi-tech, and trendy than "Mk V". 4L engines A plug will be installed in position #4 to prevent oil flow thru this passage. These are what you want (from a V/R press release, presumably prior to the Gen 6 engine release): General Motors 7. I pulled it from a 99 chevy 3500 suburban. 781 heads. Reply. Reason I ask is I'm thinking 454 maybe 496. When you have the funds, get the springs the cam maker suggests. Specifically, I put L-29 Vortec heads onto a Mark SUPPOSEDLY, the casting was "corrected" for the Gen 6 block, which accepts any year head. I am using 049 oval port heads from 1971(1/3 the cost of aluminum and will flow what I need up to 5500). 13. If it's a Gen 5, the 396 heads will require a speacial head gasket by Victor . A wide range of aftermarket heads also fit without much difficulty. This is for when you use the early cylinderheads on the Gen 5 block, (91-95 454). I built a gen 6 motor using the 4 bolt 454 block100 cc edelbrock aluminum heads and performer air gap, 502/502 chevy hyd roller cam, I built a gen 6 motor using the 4 bolt 454 block and Chassis 1st & 2nd Generation Chevy II/Nova's 3rd Generation Chevy II/Nova's. 200 165 . You can buy one from GM with a pick up tube and gasket as a kit. The water passages in the head should overhang the lifter valley. I sonic tested it, and it could have gone to a 4. 540" bore - 0. 4. If you could find some rebuilt on the cheap you'd be money ahead and reach your goals pretty easy. I dropped L29 heads onto the 454 in my boat. The mark V blocks are the special ones. The Gen 6 is sometimes referred to as the "Gen Fix" because it fixed a number of issues that disappointed enthusiasts when C3 Tech/Performance - Big Block 454 Cylinder Head Question. Engine Mark IV, V & VI BBC but if you use a Mark IV head on a Gen VI block it will overheat unless you revise the water passages in the head to match the block Or just go with a 454 block from a Gen 6 or Mark IV? Thanks!! All replies are welcomed!! 1) Because of the revised cooling passages Mark IV heads will have a big water leak if bolted onto the Gen V block (there are adapter plugs and gaskets to work around this but they generally still leak). you can get felpro head gaskets to run any head you want on them also. General Q & A - 454 Mark IV Block with 502 Gen VI Heads - HI all, I have a 1988 454 Gen IV block with the high perf merc Cast Iron stock heads. Does anybody know if these 781 heads will fit with the special gasket? There are gaskets made specifically for this swap. I know the mark IV heads will work, needs a elec fuel pump, and I know the lifters areb . It is a replacement engine block, has the aluminum 6 bolt timing cover, mechanical fuel pump boss, etc. baja226s. height. Victor makes headgaskets that are specific L/H & R/H. 4L (454 CID) engines use two types of engine blocks: the Mark IV and Mark V. I was looking at the #'s on the block, and in the back side in front of the flywheel it says MK H-5 Budget and aluminum heads aren't usually in the same sentence. I've got a 1992 Gen 5 454 bored . 4L/454 Chevy big block Gen VI Headers and get Free Shipping on Orders Over $109 at Summit Racing! Shop the CLEARANCE SALE! Cylinder Head Port Shape. What are the pros and cons to using one of the newer blocks with my existing heads? Do all of the newer blocks also have provisions for Z-bar mount, mech fuel pump, all of the bolt holes for my acessories? Gen. Thanks . only drawback is no place for a fuel pump. I don't think that'd be a problem with a Gen 5 block, Ok, so my 2000 K2500 454 has spun a main and or rod bearing. 4L/454 Chevy big block Gen V Cylinder Heads and get Free Shipping on Orders Over $109 at Summit Racing! Big Block Chevy Cylinder head, Aluminum, 335cc Rectangle Intake Runner, 122cc Chamber, 2. Use head gaskets to fit the BLOCK Find CHEVROLET 7. Jump to Hi, I need some help with building a pair of gen 6 BBC heads for a mild motor. The Gen 5 blocks can only use Gen 5 specific heads. It's iffy - some have been successful, others not. Does anyone know if the gen 6 square port heads will work on a gen 4 chevy 454 block? My rebuilt engine was stolen from Roadway shipping company which was the 370hp motor from mercruiser. The block was already cleaned and bored when I located it. VI Production Chevy Big Block - 4. Victor-Reinz had a pair of head gaskets specifically designed to mount Mk IV heads onto a Gen 5 block. 135" rods. 4L (454 CID) engines use two types of engine blocks: the Mark IV and 19170538 - 454 Gen. 99 Quantity: Performance Head Gasket Bore 4. Some are a "Gen 6" (latest) The Gen 5 bb's have relocated water passages in the decks of the block and head. GM used the same head and hydraulic cam combo on 4 different big block packages: 396 / 360 HP @ 5600 RPM 66-67 Chevelle 402 / 350 HP @ 5600 RPM 70 Chevelle It seems to be possible--but very difficult--to install IV/5/6 heads on the Gen 7 block. on the rear of the block it leaves one open. Priced Crane, $900!!! This is a budget deal, street and If you are building the engine with a gen 6 block, The two most prevalent big-blocks offered in our LKQ Pic Your Part were the Gen V and Gen VI 7. I have found a set of gen V rectangular heads for my gen IV ls-5 454. I’m getting water In the oil. With the reluctor on, the timing cover was hard against the reluctor. 4L Head General Chevelle Tech Area. Of course, the Gen 7 block won't accept Mark IV, Gen 5 or 6 heads without enormous rework. 454 Gen 6 lifters. 4 454 GM L29 Gen 6 Marine , 4 Bolt Main , Short Block 96 + 1996 -2012 Rotating assembly Engine Motor Big Block Chevy , 50 Hours on Rebuild Find CHEVROLET 7. com, with a one piece rear main and a provision for a fuel pump it maybe a Gen 6. 065"/1. Later engines continued the numbering system as Generation 5 (Gen 5), Gen 6, Gen 7. As an added bonus, most if not all Gen 6 engines use hydraulic roller lifters. The Gen 6 gasket blocks the big rectangular water hole at the back of the block, forcing the coolant to come up between Find CHEVROLET 7. Oil should be returned to the block in the 3/8” hole located just able the oil filter pad. heads can be swapped with the proper gaskets. 1L (496) machine/casting work is on par with LS, backwards compatibility to any other early gen blocks. Gen VI heads are a very nice torque head and the exhaust port flows better than the Mark IV oval or rectangular port heads, so when you choose a cam you want one with only about 5* more curation on the exhaust as the exhaust flow is better matched to the intake flow than the earlier heads. some say its a gen6 while others say gen5. While it is true that the Gen 5 and 6 blocks have different cooling passages than the mark 4, only the Gen 5 is limited in the heads it I ran Gen 6 L-29 Vortec 454 heads on a Mark IV 454 block in my boat for several years. Low What exactly are the differences between the generations of big blocks? The big block Chevy engine, AKA BBC, AKA Rat Motor, has been in production since 1965. Conversion of a MK IV from series to parallel involves drilling a few holes on each block deck surface, and using the parallel-flow head Do Gen 6 heads fit gen 4 and 5 engines? I want to bring an old 1988 454 Merc 330hp engine up to 450hp and was wondering which heads I could use? 1. All accessaries from gen 4 will fit it, other than no mecahnical fuel pump. Gen 6 works with better variety of heads. It fit nicely, until I put the timing cover on. Specifically, I put L-29 Vortec heads onto a Mark IV 454 using Mr Gasket steel shim head gaskets. Free Shipping Made with a pre-flattened steel-wire ring, Fel-Pro performance head gaskets have the strength of steel-wire sealing and the minimum brinelling of aluminum heads. 310" Bore, 9. Do I need to So here's the fix. how much power can i make with bbc peanut port heads? do the junkyard, peanut port bbc heads make big torque? should i get a gen 5 454 from the junkyard? wil General Q & A - Gen V heads on early 454 block - Will 088 heads off a GEN V 502 fit on a early 454 block with casting #361959. The general consensus is that even though they have aftermarket Put your bibles away and behold my listing for this Gen 6 454 big block chevy RUNNING on the stand much to everyone elses discomfort. 1 liters (496ci) that appeared in 2001. look at the block and head casting #'s for starters. Stroker Ace Ventura 136 BBC Gen 5 questions My cousin has a bbc generation 6 454 we want to beef it up a little on a budget. Gen V and Gen VI GM heads can not be used on Gen IV block. 039" compressed thickness - Big Block Chevy Generation 5 & 6 Adjustable Rocker Conversion. Thankfully, the Mark IV and Gen V 454 big blocks do carry enough You need to use a head gasket to match the BLOCK. While you shouldn't damage anything, the stock springs will work with a higher lift cam BUT you're increasing the possibility of valve float so don't rev it until you do the springs. V and VI are the same. I'm not sure if there 's a specific thread on this or not but I'm hoping to gather some info on upgrading a gen V 454. 4L/454 Chevy big block Gen VI Cylinder Heads Cast iron Cylinder Head Material, Rectangular Intake Port Shape and get Free Shipping on Orders Over $109 at Summit Racing! Final Day! $20 Off $250 / $40 Off $500 / $80 Off $1000 - Use Promo Code: CYBER. Check your casting numbers over at mortec. Look at the water passages in the head at the intake valley area of the block. I also have a book that deals strictly with the Gen V and VI blocks. There is NO problem with newer (Gen 5/6) heads on the older block. Performance GEN 6 454 HEADS. I would put the head on with no gasket and come up through the lifter valley and scribe a line following the block all the way across the head. I have 1969 Oval ports sitting atop a 1998 454 block, destroked with a Mark V 366 truck crank to yeild a 427. i took a pic of it Big-Block Cylinder Heads Important Technical Note: Use of the adjustable Mark IV cylinder head is not recommended with the new "Gen V engine". You cannot put gen V and VI heads on gen IV because the water passage will overhang the lifter valley. All Gen 5/6 engines are parallel cooled, most but not all MK IV are series cooled. 280 I have a gen V block that I'm rebuilding and I'm haing a hard time finding a good set of heads to go with it. Photo Contest Forum; General Q & A. 0 out of 5 stars. GEN 6 BBC 454 Stock shortblock (1997 I think) 9:1 compression Vortec L29 Heads 99cc chamber volume (small ovals) Further Head specs-Intake Port Flows CFM @ Lift 63 . Despite "EFI" on the decal, it appears to be an MPI motor with 8 injectors. - I'm planning my 454 build, and was looking for some heads. 4L 454s. com 156 heads are new to me, will look around. 822(guess) Cylinder will have a finished bore of 4. 725 Lift The new Vortec BBC is a Gen VI block with the same old peanut heads only using port injection EFI instead of the tired old TBI that has been the mainstay in trucks forever. Gen V or Gen VI heads on a Mark IV block - again, the Fel-Pro 1037 is the same gasket recommended if doing that. I replaced the first Felpro paper intake gasket with the Felpro 1210. Series cooled, or parallel cooled--no matter. A 427 and 454 Chevy use the exact same block, so the heads for either motor will physically bolt right on, if they're the same vintage. The Gen 6 is The bonus of it being a Gen 6 is that you can use Gen 4 heads on a 6. I know that in some cases, water seapage would happen when trying to install the different Gen heads on the 5 blocks. The Gen V also was fitted with a non-adjustable valvetrain. It also takes a speacial oil pan. Gen 5 and Gen 6 blocks both have different style timing covers, but use the same oil pan. General engine tech -- Drag Racing to Circle Track. Found lots of Gen 5 454 motors for 600-1200 but can’t find any Gen 6 around me. Though both generations of the 454 shared fuel injection, the differences between the two were significant. I have 60 hours with 5lbs of boost. General Q & A. FYI it’s a 496. 4-5 yrs ago I bought a mechanic friends 1975 “959” 4 bolt with fresh machining . Of course, the Gen 7 block won't accept Mark IV, Gen 5 or 6 heads without It's so confusing as to what will fit what and what won't and which gaskets need to be used with which heads vs the block, that you'd be better off just sticking with Mk4 heads on Found a reasonably priced 454 MAG EFI gen 5 donor motor with a cracked block that I am thinking about purchasing so I can use the heads, intake and ECU with my Gen 6 There are (were?) special head gaskets--different part numbers L and R--to put Mk IV heads on a Gen 5 block. I am still searching for a 454 block to build a new motor and wanted to stay with the Mark IV. 78. The Find CHEVROLET 7. zxho bpdlk xbqwqg lkusi kfmuj hdhiq vviwt yttl guzhm gprk