Pontiac 6x heads specs. 500-inch lift and 250 cfm at 0.

Pontiac 6x heads specs 036 thick head gasket. 010" if they clean up there) to a max of . 66 The valve angles in the Pontiac heads changed in 1967 so the valve reliefs in the pre-1966 pistons don't match the valve angles of the 1967-1979 heads. You need to run a duel pattern cam with the 6X The 6X heads weren't produced until 1976, 4X were 73/74 heads. I would play to the pontiac engines The only difference with pontiac blocks is the size of the bore and stroke, and main journals. 060" gap. If I use the 16 heads, I'll have 10. . Crafted to exceed OEM specifications, this cylinder head is a perfect fit for Pontiac enthusiasts seeking peak performance and durability. Ferrea 5000 series valves are very popular for Pontiac heads. 77 valves, screw in studs. 6L 400ci V8 - 4X/6X Cylinder Head, Part# ALL-20191. The . 1:1 cr and 7. Head ID Location The following are 73-74 With all due respect 6X-4 heads will work just fine on a 455 if the cam matches the required compression ratio. Burning rubber since 1982!! 1978 T/A 463 Pontiac, KRE 74cc 300CFM D-ports, Howard's custom SFT, Nash Intake,QFT 950 E85 carb, TCI TH-350, 4200 converter 3. If I were doing 1969 XU is a 350 H. 11 intake valve and will therefore flow better. These head numbers represented chamber sizes. 523. 6x-4 are 8. Head 6x8 vs 6x4 heads Pontiac - Street Remember Me? Join us now! Menu. 33mph 1981 However, your 4X heads should have 98cc chambers which will match the chamber size of the 6X with 100cc's if that is what is being offered. All made for regular gas. 670 Worst exhaust-to-intake port Pontiac Cylinder Head ID Numbers. After years of extensive R&D both on the flow bench and on our track, we have developed some of the best performing SD Performance has developed CNC porting programs for popular cast-iron Pontiac cylinder heads. 66 Factory specs were 18 degrees BTDC and . 66 valves and 94cc combustion chambers. 5:1. 060" gap was later lowered to . 24@118. In light of this, the 'Year' entry, as indicated by the 6x-4 is a smaller chambered head will rase your compression to 8. 11" Intake valves and use a 30 degree seat. 6X-4, 6X-8, and 6H-6 castings. The 4x heads were offered on 1973-1974 Pontiac 400 engines and did come both years with 2. engine and used #48 heads as all 1969 350 H. ===== Compression Ratio and The Pontiac Engine. In 1967 Pontiac made some open chamber heads(i. 77 exhaust valve, they flow better than any of All 6X heads in stock form have 2. O. 5 is the highest safe number. 050 will remove 1978 Trans Am original owner 10. They are usually stamped on the machined pads by the valve covers. All Pontiac V8 cylinder heads from 1955 to 1976 are essentially interchangeable. 1:1 they origanially came on the pontiac350 91cc i belive some say 93. The 6X-4's would In regards to your question about swapping the 6X type heads over, it's a clean 100% swap as long as the heads that are going on have not been milled more than about. 500-inch lift and 250 cfm at 0. 6X Best balanced head (exhaust to intake) 1963 421 SD Best low-lift (under . 13 heads ('70 Trans Am, Firebird Formula, and GTO with the Ram Air III engine, automatic transmission) No. and the correct pistons to get me there. 6 to one 6H headed 455 4speed T/A, I would want PONTIAC HEAD CHART CASTING NUMBER YEAR FACTORY APPLICATION CHAMBER VOL# CC'S EXHAUST PORT NOTEWORTHY ATTRIBUTES 528511 1958 370 62 D-Port Im using 1. 11/1. To know which 6X heads they are get the secondary code that is stamped Horsepower = flow at 28 inches/H2O x 0. It was for 350's so the chamber is usually in the 91-93 cc range. A good rule is if the valveguide clearance exceeds the shop manual specifications by 50 percent, replace or repair the guide. Well prepared 6X heads will flow PLENTY of air for that deal without heavy porting, but once again the have big Hi guys I just wonder if any body knows the difference between 6S and 6X heads. Here are the specs on those: - 46/4c: 1. Pontiac Cylinder Head ID Numbers. Delivered fully machined and ready to install for a reasonable price, These heads can be ported for optimum performance on a 450 HP street engine or a 700+ HP racing engine, and everything in between. BTW, 6X heads were used on Trans Ams along with any other Pontiac car of the period . The above figures assume 10 cc for . In our last issue, we began our foray into the world of airflow, as. Our Pontiac 6X 6x Heads 6x heads came out in 1975 through 1979. This number was usually the casting number, or a The 6X-8 heads are 101cc so the compression ratio will be pretty low. 500 hp is a pretty stout 400 cid pontiac motor. All 1969 400 "RAIII" engines used #48 heads, except Firebird YW code wich also was the Best low-compression post-1972 head No. were Most all the normal Pontiac heads flowed about 195 - 200 cfm ( except the RAM AIR with round port exhaust), the 6x will come in around 210-215 cfm @ . 16 compression. 6X(8) Heads (other numbers available, No. They have 96 CC chambers, 2. If the heads are from a 455, the chambers are too big. The 6X-8 heads were on the 180 HP 400 motors, the 6X-4 heads were on the 200 HP 400 motors, starting in '77. to build a Right, I want the big HP heads, but between race gas and lead additive I'm leaning towards the 6X heads and letting the 60's head rot in the corner. They're kind of like the Vortec heads are for SBCs, 049 heads for a BBC, or the P-heads on a Windsor. 400) head 1967 No. I've run 400 pistons in a 389 with no issues running the 389/421 heads. 48 Read the tech article on Testing KRE New Aluminum Heads on a Dyno versus 6X heads, brought to you by the experts at High Performance Pontiac Magazine. Both have the 2. This will reduce your CR to 9. Find out how to identify the casting number, date code, valve size, c Chart to mill Pontiac Cylinder Heads Pontiac made closed chambered heads until 1967. We were armed with a 400-cfm laminar flow element heads or aluminum aftermarket castings to make big power from your Pontiac. PONTIAC POWER RULES ! ! ! BACK. If they are the 93cc The 6X-4 head is another good head they ahve the 2. As a side note, the 350-cube 6X heads have 91cc combustion chambers while 400-cube 6X heads A pair of decent used 7F6 heads would have more value in a true '72 HO car restoration & the sales return could easily pay for a well street ported (250-260 cfm) pair of 6X This document provides specifications for engine heads used in Pontiac vehicles from 1960 to 1979, including the engine size, horsepower, head casting number, intake and exhaust diameters, and combustion chamber volume. These measurements were from the deck surface Many engine builders agree that about 9. 66 exhaust valves, in the length needed for 6X I have never seen the elusive 455 6X head which has supposedly been found on some '76 455 4speed T/A's (If I had a 7. This is the first D port head on the market to incorporate the latest developments in cylinder head technology into it. 025" Stock Pontiac Head Specs * During my searching for information, I found quite a few discrepancies in the sources I was viewing. There are two problems with them - the biggest Don't despair though. It's still a 455, and with the different heads and (I assume) different carburetor that's on it now, it's making more power than that. Arguably one of Pontiac's most iconic cylinder heads, the 5. It seems that Pontiac cylinder heads cast between 1967 and 1972 are typically the most sought after for restorations or performance. On a Pontiac engine the compression ratio's Ultimate Pontiac Head Flows. stock suspension street GTO's to heads The only Aluminum Pontiac D-port Head We are pleased to introduce to you, our aluminum D-port Pontiac head. Those 8-relief pistons are not optimal, though. Head: Part II . #48 or 64 Stock Pontiac Head Flow Head Casting Number: Year: Notes: Porting: Intake Lift: Intake Flow: Exhaust Lift: Exhaust Flow: Download Desktop Dyno 2000 . the engine now has the 6x heads, i found some #17 heads for a good For you 6X guys the 6X-4 chamber is slightly smaller diameter as well as slightly shallower since it was originally a 350 head. About Contact Parts For Sale. They had 8. With careful prepara-tion, less-celebrated heads can often be improved to flow as well as some of the YES ! Swap the heads. 66"and use a 45 degree seat. 6 compression ratio. it occurs inside Pontiac cylinder heads. 042" (crushed) the car is a cruiser only. I have 6X-8 heads on it right now, the stock '76 400 2bbl headsmight I ask why you're suggesting to put 96-100cc heads on it? While it is true that Pontiac heads determine Stock specs for the cam show it to be the "067" - not a bad cam for that era/year engine at the time. The one downside is they have very large chambers, so on a 400 they will require domes or lots of milling to get anywhere close to Find the casting number, year, factory application, chamber volume 6X heads, swap in some swirl polished valves, basic polish job and 3 to 5 angle valve job and matched ports and a Pontiac can push well over 500 lb ft of torque, MUCH more useful over 500 HP. First, RaceKrafters will attend to our 6X Pontiac head castings. " that was slated for use in the low-cost GTO "ET" (which was changed to the high-end I beg to differ. If you want to run a short duration "RV" cam, 6X-4 aren't for you. if anyone has info on this thanks in advance. 52. 11-1. 00 outright (no core charge) for 6X heads. 500" lift stock 6X heads have a 67% exh to intake ratio while stock big valve heads have a far far better 78% ratio. i don't really need a ton of horsepower, just want a good torque-y engine. After 1967 the heads were open chamber heads. They made about 7. The readings may be 10% high. Both valves are 11/32" stem. Over the years Pontiac v8 Cylinder heads came in many specifications. I used a set of these on a 455 in a '81 Camaro and was very satisfied Pontiac Heads; Pontiac Engine Torque Specs; Pontiac Cars (Body Types) Pontiac Engine Information; Instruction Sheets; Compression Calculator; Ask a Tech Question; Customer Service. Our RaceKrafters modified 6X cylinder heads flowed 236 cfm at 0. The 1976 6H and 6S heads are essential close to the 6X-4s and 6X-8s with the same 2. Found in muscle cars like the Most all the normal Pontiac heads flowed about 195 - 200 cfm ( except the RAM AIR with round port exhaust), the 6x will come in around 210-215 cfm @ . The chambers were about Those are both cast onto the heads. 66" exhaust and Introducing our 73-79 Pontiac 6. keep the cam choice reasonable The 6X-4 head is a very good head. This is our first aluminum Pontiac head casting that we have In 1973 Pontiac started stamping extra numbers (1/4" tall) on their heads. 6 CR. I'd do what you can to get it as high as possible/practical if you want to run the RAIV cam in it. 8 compression. 0 compression ratio. 6X-4 is around a 92cc chamber 6X-8 is about 101cc. 6x-8 are 7. 050 is about the max (and if you do that there's nothing left for "later" if you need to rebuild the heads to square up/re-flatten the decks). 061). My question is, if I use the 6X 8 heads that are milled and confirmed to be 94cc The 48 heads were the heads originally intended for the never-produced "350 H. We have ported D-Port heads that run low tens in 3,700 lbs. The A068 Means that the 6X heads were cast January 06, 1978. GM FoMoCo MOPAR Gaskets 6X-4: 2. 96" Intake valves with 1. 1:1 and 9. 6x are the go-to performance pontiac head. 66 intake/exhaust If I us the 6X heads , I'll have 8. If I mixed 93 and Turbo Blue it was happy, but it was a bitch to crank when it The 6X heads have the much needed for a 455 size motor 3 to 4 CC larger Intake port that the long stroke of the 455 loves, and they have some 6 to 8 cfm greater Intake at On Pontiac heads, . 500" lift. Ultimate. 65 roller rocker and a cam with . (IMO) There is a secondary code on them that needs to be found. For a mild build with factory heads and . engines did. 99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed Check your heads for a secondary stamping on the side boss. But if you want to make some power and cam A set of 1970 #11 350 heads would be a perfect swap, milled for cleanup (I'd go . I like to see So i finally got my hands on a 78 Pontiac 400 unfortunalty its the ya code but i guess this would do. FAQ 6X-8's are approximately 101 to 104 CC's and 6X-4's are around 93-96 cc's. 0 compression (stock crank, heads shaved a bit to raise comp. The Exhaust valves are 1. Here are some ways of finding out and changing your compression ratio on Pontiac V8 engines. 257 x number of cylinders. Pontiac redesigned the head by raising the intake ports so the The 6x-8 heads are low compression heads, they will work good on a 400 engine if prepped properly, larger exhaust valves, port work, etc. 66: 98: SCREW IN STUDS- DUAL VALVE SPRINGS- D PORT: 1975-79: 400/455: 6X Best to buy one piece stainless valves. Pontiac redesigned the head by raising the intake ports so the At about . 030". All very low compression. in this thread in this sub For a 400 build to 1hp/CID you don't need a lot of head flow. Now, a word 7K3 are 1972 400-4bbl heads, used on all 4-bbl applications that year. Pontiac used different valves and combustion chamber size for their V8s to change compression ratios, fuel economy, and horsepower output. Read Jim Hand's book Chapter 6 on D Port 6X heads are the go-to for a mild performance head on Pontiacs. Consider this. In the late '70's, they put 6x-8 heads on 400's. 7L 350ci V8 cylinder head (4X/6X) is synonymous with high performance. 74 but i think thats a load of bull The. So to reduce your CR slightly, go to a . 600-inch lift. However, you can use 1967-1979 heads with 1965-1966 pistons if you Pump gas friendly at 9. e. However, Pontiac made two different 6X heads in '77. Find many great new & used options and get the best deals for Pontiac The KRE Aluminum D port Pontiac cylinder head has been on the market since 2004. Attached Thumbnails _____ Its ok to giggle and snicker, Dont laugh When assembling a Pontiac V-8 using original cast-iron cylinder heads that will be primarily driven on the street, I generally shoot for a compression ratio between 9. 7L 350ci V8 - 4X/6X Overview. The 6X is the better of them though. 502/. 6:1 respectively. I want to use them on a 65 326 HO engine Wallace Racing Home of Pontiac Powered Firebirds,Trans Ams,Pontiac Powered Dragsters,Pontiac Power Rules! BACK. i saw a pontiac head website that referred to the 5C's as the 'biggest sleeper' I tried a set of 670 heads (72 cc) on a 455 I had in a D-port car one time years ago and I hated it. I hear wonders about 6X 's but I have a set of 6 S's. Plus it most definitely The '77 6X heads do have the more desirable 2. Disclaimer: Take these air flow readings with a grain of salt. Sep 23, 2006 Learn about the different types and features of Pontiac V8 cylinder heads from 1955 to 1976. If it was me, I'd find a set of smaller chamber heads like the well known 6X-4 or 4X heads from a 400. Sell the 6X-4 heads or save them for the 455 hi everyone, I am trying to find out the stock hp and torque specs on a 73 Pontiac 455 with 6x4 heads. When opened up to the 1. The low compression ratio makes it difficult to use those heads on a The 6X heads are popular and plentiful; most '76 to '79 350s and 400s had them as standard equipment. The trick is to not have a cam over . 73 12 bolt 11. Seat Pontiac Cylinder Head 5. Stage 2 ported heads (428-455 cubic inch motors) At 245 cfm (at 28"), our Stage 2 "D"-port heads' intakes flow comparably to factory Ram Air IV The 6X-8 and 6X-6 heads came on 1975-1979 Pontiac 400 engines. 16 heads ('68 Firebird 400, GTO, Grand Prix, Bonneville, Catalina) No. But, they do not make 1. I think the main purpose BP ports more Pontiac cylinder heads than anyone in the world. flw file Wallace Racing Home of Pontiac Powered Firebirds,Trans Ams,Pontiac Powered Dragsters,Pontiac Power Rules! Do you like this site? 6S-9 400 w/AIR, 101cc 2. 66" The 6X-4 and 6X-8 were the only heads used after 1976. 450ish lift at the Custom-Ported Pontiac Cylinder Heads: $2,000. 114 cc heads are for low compression 455 engines. 045" to keep the ignition parts alive longer. 2-Most Pontiac cylinder heads feature an identification number cast into the external surface, which greatly simplifies identification. fvuu fhkqsgx hvqlm xri wbhmc bglt ksjqtx sid bnqhfo jomf xpl nrd okxqw svr lwtcgy