Pontiac 5c heads. Reworked Q Jet, a cast iron EGR intake manifold, along .

Pontiac 5c heads This should free up a lot of turn around time on head porting. 5C : 1975: 350: ALL You can also find yourself a pair of 6X-4, or 5C-4 heads and have them milled to get the chamber volume down to where you need it. I think that the 6X-8 would be the best for your engine, using pump gas. Shop by category Edelbrock E-Street Cylinder Head For 1975 Pontiac Grand LeMans 04A3ED-2B5C. I am meeting with him this afternoon to hear it run and help him pull it if I decide to buy it (which I most likely I have since pulled the #15 heads for #197 455 HO heads, aluminum intake w/ Q-jet, and factory HO exhaust manifolds on the same short block with the 2802 cam. 7 from a 1968 Firebird The owner rebuilt it in late 2011 and swapped the 5C heads for the 6X heads. 2 compression where as the casting number 22 casting head is the casting number head that would have come on the 1965 285 hp 326 HO motor and would have had a factory stated 10. 66 or 1. They'll be along in a little while to help you. New P255/60 R15 Cooper Cobra tires. I have found them, usually, to be close, Pontiac V8 Cylinder Heads (wallaceracing. $50. FER-F5074-8: 2. PONTIAC HEAD CHART. 66 exhaust screw in stud 93cc same as 6x 4 heads. 2. Ultimate Pontiac Head Flows. "The 6X and 5C heads have one advantage over all the other choices, that being a superior intake port shape with a better short-turn radius. holley 850. $100 obo for all! Pontiac 5c heads and 2 barrel intake - Car Engines & Engine Parts - Itasca, Texas | Facebook Marketplace 1975 400 pontiac. The small bore of the 350 is restrictive. The 6X-4 and 6X-8 Other castings that fit this profile are 6X, 64, 7K3, 7M5, 4X, and 5C heads (castings numbers are found on the center exhaust ports above the manifold). Here are some ways of finding out and changing your compression ratio on Pontiac V8 engines. (3. The May 7, 1973 changeover date is Motor Unit Number 709986 assembled on or about May 7, 1973 May 7, 1973 is the head assembly date, NOT the casting date. 42 gear will be very noticeable, and if you ever get into a rebuild, a bit more compression, and an 068 style cam will help. ok so i have a pontiac 428 im rebuilding it was an engine my father built about 30 yrs ago. 351"x3,385" (110. I've seen conflicting info on some charts regarding the size of the exhaust valves (1. Best ET to date 7. 00 Stock Pontiac Head Specs * During my searching for information, I found quite a few discrepancies in the sources I was viewing. L. The best hardened exhaust seats started in '75 beginning with the 5C heads. Ultimate Warrior : Join Date: Jun 2003. mojonelo There are about a half dozen Pontiac enthusiasts on this board. $12 $15. I ported the 5C heads at the time, along with a fresh valve job. After 1967 the heads were open chamber heads. · Home Decor. 5C (1975 350/400/455-cid D-port) Date cast: F184 Grade: 1 Valve sizes: 2. i had stock 6x heads as well but on a 455. Up into the early 90's, most traditional Pontiac guys scoffed at the 6X heads, & didn't know about the secondary (stamped Voodoo Hydraulic Flat Tappet Cam - Pontiac V8 262/268 - Lunati Power If you use the #16 heads, many think it is a good idea to have hardened valve seat inserts installed, for use with unleaded fuel. I would suggest that you try to find a pair of later heads with a little larger combustion chamber like 46 from a '73 or '74 350, or 5C-4 or 5C-7 from an early '75 350, or 6X-4 used on some 350s after late February 1975. Good complete cores. 07-14-2004, 06:49 PM. Combustion Chamber Volume cylinder head question about the 400 pontiac. 5 hp vacuum cleaner motors), two graduated vertical manometers to measure atmospheric pressure, an incline manometer to measure actual airflow, and a velocity probe. _____ '73 Formula - Buccaneer Red Matching #s Now, your 140 casting heads are not original to your 65, the 140 casting came fitted on the early 1967 250 hp 326 cid motor and are stated to produce a 9. Heads with casting dates starting around mid-March 1973 to mid-April 1973usually will have screw-in studs. 0 out of 5 stars. If you Do not know your current need the actual compression of your setup now to complete this calculation. 56. The heads are 5C's from '75 that flow roughly 200cfm intake at . My 5c heads are in fact drilled but am thinking of buying a reman engine and they said they run either 4x Basically they are the 1975 version of the 76 and later 6X heads. 6 H. 5C heads for a 455 Pontiac - Street. Identical in performance to the much-touted '6X' casting head. 5C Pontiac Heads and intake 2 barrel intake and carb. YEAR & FACTORY APPLICATION 5C,5X,5G. 93-114+ D-Port. If you came here from a search engine or are not in a frame,click here. Custom Interior completely redone . 2 40x40 black outs Price is for one. 00 per pair ; Hardened exhaust seats machined and installed add $120. Date codes on heads j034 i064 no other modifications have been made to the heads pontiac 5c 4 heads I was saving these for a future project, but my plans have changed. 62 to 1 compression with the . My plugs are r45ts. But these heads don't give a 350 enuff comp to make any decent power. No, you don't want 455 heads. Greenville, SC. Different chamber volumes, some huge for 455 engines and some small for 350 cid. The 4X head was the 49-state casting used on all '73-74 400 and 455ci engines. 11" intakes/1. 46's offered better compression and had been reworked w/ bigger 2. 8:1,edelbrock 650 Avs. The way Pontiac changed compression ratios throughout the years was by changing combustion chamber size. 4X, 5C, and 6Xs are shown. it occurs inside Pontiac cylinder heads. Screw-in studs are best because you don't have to have a machine shop do this conversion, so it saves you money and keeps your costs down, but it can be done 2-Most Pontiac cylinder heads feature an identification number cast into the external surface, which greatly simplifies identification. Marketplace access. Just curious about what y'all think about 4X & 5C heads. Jump to Latest 5K views 2 replies 3 participants last post by JohnnyB Oct 15, 2014. Here's a good head chart for reference Cylinder Heads Performance Guide for Pontiac V-8 Engines includes instructional photos, checklists, and step-by-step instructions on upgrading to the GM Gen III LS-Series PCM, ECM, Electronics, and PO -5C, and -6X castings make I have a pair of 6x-4 heads that have been cleaned up, had the mounting surface leveled, and just need reassembled. About Us. 5c heads. O from a 1976 Trans Am A 350 5. Yup, that's the number of the heads - 143. Refinished Rally II wheels . Head codes - 51,5C,6X,6S,6H; 2-101cc's: probably special 455 head for 455HO T/A: 4-91 cc's: I have these 72cc heads that I would like to use and the heads on the engine right now are 101cc so I could have him mill half the distance between the two. 11 intakes and smaller 1. 0 255 4X 1-2 7044066 Block Casting # 481988 According to Wallace Racing and another source, 5c heads were used in '75. 400-inches for most applications. 4:10 Pontiac 400 with the desirable 481988 block that can be built to handle high HP. 301 . 77's though. Preparation: Hot tanked, magnetic particle inspected for cracks, and shot blasted. Ferrea Hi Perf. Early 389/421 heads with thru stud oiling These studs do not have oil thru holes on certain pre 64 heads, simply use rocker arms and pushrods with oil hole on oil thru stud applications, we also plug the block with 2- 1/8 npt pipe plugs at deck to keep [Archive] 4X vs. 800 exhaust valves, Guides & seats included After the 6x heads, my next choice would be the 350 or 400 5c heads, followed by the mid '73-'74 #46 heads with screw-in studs. 1967 Pontiac V8 Head Bolt Set $55. but better cams are available now. Dearing, Kansas · Within 621 mi. You can pee in the gas and it should Bare 356-T6 Aluminum, 400+ cfm flow out of box, 50cc combustion chamber, 310cc intake port, Will accept up to 2. 5° LSA Hydraulic i had an RPM intake on my 455 powered 69 custom s over 15 years ago. 23:1) axle and the complete M-20 4-Speed changeover, all of which is going in behind the 60,000 mile Pontiac 350. Would trade for a good 4-bolt 350 core. 60: 69 cc SD head: 1959: E heads on a 350 Pontiac a sure fire very expensive boondoggle. Jump to Latest 901 views 4 replies 3 participants last post by BrianB74SD Oct 10, 2021. Pontiac Cylinder Head Search There is also a picture to show where to find the secondary stamp. The readings may be 10% high. 77" valves during the head rebuild along with the BB Chevy screw-in studs you mentioned. In light of this, the 'Year' entry, as indicated by the chart below, may actually represent the year that the heads were cast, versus the year that they were actually installed on an automobile. 87 for deck height volume) Cylinder Head, Performer RPM, Aluminum, Assembled, 72cc Chamber, 215cc Intake Runner, Pontiac, 389-455, Each. The head gasket Pontiac used for its V-8 was a composition construction consisting of a coated steel core. Most of us are going to upsize the 1. YS stamp indicates the motor is from a 71-72 GTO or Firebird. Have a couple of 481988 two bolt undrilled blocks. I have the intake and timing cover to go with it. Ive been chasing what im thinking is some type of spark knock. EDELBROCK. True dual exhaust with chrome T/A tips. M. They should be the "5C" heads which have 99-101 CC chambers making the engine a 7. Free returns. 77" so the hardening will be gone anyway. Condition: New In 1975 Pontiac started stamping extra numbers (1/4" tall) on their heads. Free shipping. Pontiac 1973-1974 Cylinder Heads; No "H" stamp on early 1973 heads. the question is, should i keep them or go for the edelbrocks? the car is a cruiser only. 95: Ferrea Ultimate Race Valves The 6000 series competition valves are designed to provide excellent reliability in an environment of high sprng pressures and roller cams, at a budget price. 9770716) Basically, all Pontiac D-port heads with the 2. PY Online Forums - Bringing the Pontiac Hobby Together > General Classic PONTIAC TECH > Pontiac - Street > why are 5C head castings so ugly? Reply Thread Tools: Display Modes #1 08-23-2019, 08:04 PM F ROCK. Part Number: EDL-61579 3. We were armed with a 400-cfm laminar flow element (powered by six 1. Air & Fuel Delivery; Apparel, Cups, Decals, Books, Gift Cards; Brake and Body Parts; Camshafts & Cam Kits; I recently rebuilt a 75 350P for Derrick- we swapped a set of no. View Full Version : 4X vs. You won't need the hardened exhaust seats on the 455 heads and depending on the amount of miles he puts on the car he won't need them in the 143's either. We have a great online selection at the INTAKE MANIFOLD BOLT PATTERN IS THE SAME FOR ALL 65-79 HEADS. Blowby can be caused by the heads if the guides are bad enough, depends on how bad it is. Common Pontiac Numbers: Stroke: CID: 3. The casting numbers are on the outside of the head. 6- 101cc's. 500 lift @ 28") heads, every Pontiac headporter/engine builder in the country would be using them for basic D-port pump gas 455 builds. We also machine cast iron heads to accept the same style as aftermarket heads which accept the positive locking valve ARP 190-3607 Head Bolt Kit Pontiac 350 400 428 455 1967 & Up with D Port Heads. Free UPS Shipping. 5 with steel 64 heads the heads that were made by Kauffman are 72cc cnc d port took 55. I have a rebuilt Pontiac 400 with 5c heads. They also include hardened seats, bronze valve guides, and fully machined valve cover rails for a more Stock Pontiac Head Flow Head Casting Number: Year: Notes: Porting: Intake Lift: Intake Flow: Exhaust Lift: Exhaust Flow: Download Desktop Dyno 2000 . and S. They also have pressed in studs and are around 72-75 cc. Categories Think of it this way, if 5C's were stock 220-230 cfm (@ . 750" stroke. 5x86mm) as saying that the short stroke favors high speeds engine. Since then, it has become the mecca of Pontiac technical data and knowledge that no other place can surpass. Pontiac 5C Heads. 6CR. Bill The 1975 5C-4 350 heads (2. 5L/455 Edelbrock Performer Cylinder Heads and get Free Shipping on Orders Over $109 at Summit Racing! All Edelbrock aluminum cylinder heads feature threaded inserts in the rocker studs and exhaust manifold bolt holes for superior strength and durability. 11"/1. my research says that they are 'smog' heads from 75 with only a 7. If you put heads from a '75 455 on your '70 455 then you'll have the same lousy 7. 75-76 455, SOME 350. Removed from a 389 with #77 heads. 75cc deck height volume. 67 out of 5 stars The PY Online Forums is the largest online gathering of Pontiac enthusiasts anywhere in the world. Gives 'em a headstart over 205cfm 6X's. 6 from a 1967 Pontiac Catanlina A 400 6. Part Number: EDL-60599 4. These heads can be ported for optimum performance on a 450 HP street engine or a 700+ HP racing engine Pontiac Head Specs . You have too much compression with 72cc heads and flat top pistons for running pump gas. Does anybody know if the 4x and 6x head have the two outer holes drilled and tapped for the exhaust manifolds? I know some of the early 400s did not and only used 4 bolts on each manifold. 5C Most undercammed 1963 SD, 1971 455 HO, 1973-74 455 SD (tie) Most underexhausted 1964 GTO (No. 450-. 5 compression . 66valve 101cc. Read more: Spirolock Tool & 421 Pontiac Combo - Hot Rod Magazine The 6X heads weren't produced until 1976, 4X were 73/74 heads. $1,487. Many of the mid-'70s 350s had either 4x, 5c, or 6x heads, which are highly sought after for larger cube builds. 500" lift. stock suspension street GTO's to heads that run 8. [block#481988]. FAQ: Members List: Social Groups Wallace Racing Pontiac Cylinder Head Milling Chart Pontiac POWER Rules! BACK In this engine tech article HIGH PERFORMANCE PONTIAC takes a look at the new Edelbrock Victor-series Pro-Port cylinder heads for Pontiac V-8 engines, which provide a solid basis from which head Most mild street applications will experience an easy 50+hp gain over stock heads and even more with more aggressive combo's!!! Additonal Options for above heads. 1969 GTO, 455ci, 230/236 Pontiac Dude's "Butcher Special 5C HEADS 74-76 Firebird & TA TECH. MUST USE A LONGER PUSHROD) Item #: FER-F5144-8. Large intake valves, screw in rocker arm studs, and larger 98cc combustion chambers that work great to bump up the compression ratio of a 455 or 462 stroker. See all. I pulled these at least ten years ago from a running 400 but I would have them rebuilt so consider These heads can be ported for optimum performance on a 450 HP street engine or a 700+ HP racing engine, and everything in between. The 6X heads were installed after February 1975. 66 exhaust worked well. As said above, a 3. Search for Pontiac Cylinder Heads As You Go Thru Life DO A WHEELIE !!! You Searched For: 165 Matches Found (displaying 1 to 25) Year: Engine: Hp: Code: Valve: Misc: 1955: 287: 173-180-200 HP stamped X to left of center head bolt - 10. Your account. SPEED SAFE, AIR RAM Free-$150 a pair 5c-4 or 6X-4's milled . 5 product ratings - ARP 190-3607 Head Bolt Kit Pontiac 350 400 428 455 1967 & Up with D Port Heads. 3. The "4" you are seeing may be the casting date that corresponds to 1964, but probably made for 1965. dur. SEARCH: Tripod The Web: Pontiac made closed chambered heads until 1967. Edelbrock Performer RPM Cylinder Heads 60599. Wallace Racing Pontiac made closed chambered heads until 1967. 66 6x-4 Trans 6x compatible with PONTIAC FIREBIRD GTO 400 455 350 1975. 5C-9, 400 4bbl AIR, 101cc . This number was usually the casting number, or a portion thereof. 326 . pumpgas 95,timing 12 -31° Pontiac Heads! Jump to Latest 1K views 6 replies 3 participants last post by nitro_baller4692 Sep 21, 2006. Terry McGean:The 124cc heads we used on our '76 455 for the story you referenced were indeed worthless, having the hugest chambers of any Pontiac V-8 heads, but our sources show that your 5C heads Get the best deals for Pontiac 5C Head at eBay. (available for 670, 16, 62, 46, 47 I think most of those heads without the end holes were D-ports from the 1972 model year. Pontiac redesigned the head by raising the intake ports so the short turn into the bowl is at a better angle. We have a great online selection at the Get the best deals for Pontiac 5C Head at eBay. If you scroll down to Head Search, there are several heads listed and the combustion chamber sizes given. 9- 91cc's. For sure some ignition timing improvements and some Q Jet tuning will help. ALL heads need to be measured for chamber size regardless of what they are "supposed" to be. flw file Pontiac Head Codes Home. my question is head related Pontiac 5C heads pulled from an early ‘75 Trans Am. 350 . 0 out of 5 stars Compression Ratio and The Pontiac Engine. 050" - 111. 11/1. Roland Racing CV-1 heads are machined with canted intake-valve seats and valve guides, which allow for the use of oversize intake valves without the worry of the valves being too close to the cylinder wall on Review (MPN # 5C-4 for sale) PONTIAC 93cc 2. airforrest 495 Pontiac Cylinder Head Upgrade & Engine Build - New Heads For An Old Indian - Engine Buildup. Find PONTIAC 7. These heads can be ported for optimum performance on a 450 HP street engine or a 700+ HP racing engine, and everything in between. Pontiac #96 Head Flow Numbers (at 28 Remember Me? Join us now! Menu Still hung up on Pontiac engines, i decided to replace the stovebolt six and install a stock 1970 455 Pontiac engine in the '55 Chevy. ** Use sheet stainless steel block off plate. I have not taken the 5C heads off yet but I am assuming that the chamber shape is the same just larger. marchperf. 42 gears, DOT's, 7. 20's at 96mph and still WAY under the roll bar rule. 2800 rpm ATI converter. Get the best deals for Pontiac 5C Cylinder Heads at eBay. off face of heads to bring compression back up block also 0 deck Kauffman ported to 310 also used 1. com) Your head # corresponds to a 1965 set for a 326. Chuck_Neste Discussion starter. After years of extensive R&D both on the flow bench and on our track, we have developed some of the best performing round port and D-port cast iron Pontiac cylinder heads ever. We have a great online Pontiac made closed chambered heads until 1967. These heads typically have 91-93 CC chambers in stock form and for each . 6 compression 185 HP 400CI. 885" bore with a 3. Get the best deals for Pontiac 5C Cylinder Heads at eBay. The 67 heads are the best of the bunch, the Poncho engineers rolled the combustion chamber over to give the valves a straighter shot into the cylinder through big valves and better flowing ports. Vintage Pontiac heads 3 pairs of heads. i don't really need a ton of horsepower, just want a good torque-y engine. We have a great online selection at the lowest prices with Fast & Free shipping on many items! Heads can also be milled to increase the compression ratio. Hey, I am restoring a 1970 Pontiac lemans and I have a fully restored 400 block bored . Used pair of Pontiac 5C heads. Heads off a 455. 060/. Valve (Set) $84. 5:1 CR as the '75 engine because of the HUGE chambers on those heads. *Pontiac 400 Compression area=25. Dewey, OK. 75:1 to 9:1). The RA IV has round port heads and the RA III has D port Heads. Find out what the heads are on the 455 and we'll go from there. WIP: 1941 Pontiac Two Door Sedan WIP: 1949 Chevrolet Styleline Special Sport Coupe 1950 Pontiac Streamliner Deluxe Station Wagon 50-2562D Straight 8 Automatic color-Tarragon Green The early 75 5C-4 & 5C-7 and the 75 or later 6X-4 were rated at 93cc. Would the r45tsx spark plug make a difference. Cleaning + magnafluxing your cores $130 per pair; Fill exhaust crossovers with aluminum add $100. 300 intakes, & 1. 005 inch removed from the cylinder head deck surface decreases the chamber volume about 1 cc on '67-and-later open chamber heads. bracket car. 061). 5 The 350ci's cylinder heads were manufactured by the PMD (Pontiac Motor Division) but only from 1977 to 1980. L. The 5c heads preceded the 6x heads somewhere around '74-'75. com. Many companies produced stock-replacement Pontiac head gaskets over the years, but few were as good those originally supplied by Pontiac. These are the factory ratings, so the heads must be checked to be sure of the exact combustion chamber size. I have taken the motor and trans out and was wondering how I could improve the horsepower? I would like to have about 350 hp and would like to install a cam that will give the car a lope, not so much that its not going to idle but just a little bit of a choppy idle. The cool thing about a 400 w/ 6x heads is that you could run it with the stock 3. 95 sold. I'd run a GOOD 800cfm Q-jet. Those old Pontiac heads are A 351/48-inch-od deep-groove pulley is still available from your GM dealer under PN 3829387. I used 2-Holley List 4224 660 CFM center-squirters on a OFFY 360* manifold, '67 GTO headers, a 1963 Muncie 4-speed, custom made drive shaft, Zoom clutch and pressure plate, Lakewood steel bell housing, battery Butler Performance is the main source for stock and performance cylinder heads for your Pontiac. Click Here for Edelbrock Aluminum Head Installation Sheet. We have a great online selection at the lowest prices with Fast & Free shipping on many items! Skip to main content. Both heads have pretty comparable flow numbers, no clear winner in that sense. In my 20 years of engine machining I have seen several cracked Pontiac heads. Since Pontiac offered the 400 2-barrel, the 400 4-barrel with both manual and automatic transmissions, and the 455 4 They are as good as any D-port head really, just they have a big tendency to be cracked. 6 rocker arms on my 500/510 hydro roller cam make little more power just does not feel fast . In 1967 Pontiac made some open chamber heads (i. Part Groups. The induction hardened seats started in '73 with the 4X heads at the earliest, but these heads were quite prone to cracking. 67 out of 5 stars Pontiac 5C heads pulled from an early ‘75 Trans Am. Founded in 1991, it was also the first online forum for people to gather and talk about their Pontiacs. ,420/. CASTING NUMBER . There may be a mild cam installed as the engine seems to have more power than stock. funny it gets 17 hg of vac could that be hurting my 1975 5c heads milled . Others say hardened seats are not necessary for normal street driving. i saw a pontiac head website that referred to the 5C's as the 'biggest sleeper' heads. You can have the heads opened up to accept 1. Head: Part II . I would suggest upgrading the #94 heads to 2. my 68 firebird has a 68 full-size 400 motor and th400 trans with 5C heads on INTAKE MANIFOLD BOLT PATTERN IS THE SAME FOR ALL 65 The 5C-8 head is pretty much the equal of a 6X-8 heads. 77 will aso add to the picture Pontiac 5C Heads. Location is Which version of 6X do you have? 5C's are similar to 6X-8's cc wise. now to your motor. We have ported D-Port heads that run low tens in 3,700 lbs. Every bit as good on a 400 as the 1971 #96 400 heads (96ccs + chambers), It seems that Pontiac cylinder heads cast between 1967 and 1972 are typically the most sought after for restorations or performance. Great condition. McKellar reasoned that Pontiac chose that particular amount because its cylinder heads generally contained rather large valves, and when combined with the small, high-velocity ports, high valve lift simply wasn’t required to attain strong performance. 6x-4's, 5C-4's, 5C-7's, all 94-96 cc as cores: It does not take a lot to get a Pontiac head to flow well enough for a good street build and it saves you money over the aluminum heads. a 400 pontiac should make 400 hp without breaking a sweat. Products. there are two more #s ,one on each By chatting and providing i goolged pontiac head codes & the chart said that "5c"was a 1975-400-185hp. Brand New. Leave the chambers alone, go with Pontiac Blocks- Bore & Stroke; Pontiac Heads; Pontiac Engine Torque Specs; Pontiac Cars (Body Types) Pontiac Engine Information; Instruction Sheets; Compression Calculator; Ask a Tech Question; Customer Service. 46's on and parked the stock 5C heads, since the no. hooker super comps and 3 inch bullet mufflers. ) *Pontiac 455 compression area = 25. This is a driver quality car ready for new owner to enjoy on the road!! List Price: $28,495. Remember Me? Join us now! Menu. The TH350 automatic transmission has a shift kit installed. The PY Online Forums is the largest online gathering of Pontiac enthusiasts anywhere in the world. Cylinder Heads . Pontiac Head ID 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 @ . These head numbers represented chamber sizes. Funny how the Ram Air V gets the worst exhaust-to-intake port when it was capable of propelling a '69 GTO down The. the comp 525 305 cam. Results 1 - 25 of 108 25 Records Per Page Default Sort . Hi Bear motor was 9 . 040” quench (reused the . PDA. Filter by Availability Filter Results PONTIAC Individual Parts. Intake BP ports more Pontiac cylinder heads than anyone in the world. Categories pontiac 400 481988 blocks and 6x and 5c heads Rhode Island. 66 valves, chambers 92 to 94ccs usually) are exactly the same as the 1975-1/2 thru 1977 6X-4 350 heads that are so popular. There are a lot of sites with Pontiac info. I tend to think they're 1. 005" milled off the deck surface of the head you reduce the chamber size by 1 CC. An excellent head but Get the best deals for Pontiac 5C Heads at eBay. 020 300 obo or trade Pontiac Heads - Car Engines & Engine Parts - Loogootee, Indiana | Facebook Marketplace Facebook Pontiac heads dont support high RPMs well either, at least not without some port work and even then you are limited The 5C-8 is probably the worst head you could be considering, with it's huge 114cc chamber volume you will need a big dome on your 389 piston just to get to 9:1 compression. 1974 46 heads milled. 025 pulled of running engine. We also specialize in porting RAII, RAIV, H. In 1967 Pontiac made some open chamber heads(i. Hi Performance Pontiac did a test years ago, and for the street, big 2. round port heads. Second Generation Pontiac Firebird (1970 - 1981) 15 Pontiac heads. or Best Offer. specific Compression Ratio you are looking for. Broadfoot prints Vintage. Cylinder Head, Performer RPM, Aluminum, Assembled, 72cc Chamber, 215cc Intake Runner, Pontiac, 389-455, Each. Gross valve lift was limited to just over . 75 . Pontiac Heads; Pontiac Engine Torque Specs; Pontiac Cars (Body Types) Pontiac Engine Information; Instruction Sheets; Compression Calculator; Ask a Tech Question (670, 16, 62, 13, 12, 48, AND 061 HEADS - MAY BE USED IN 4X, 6X, 96, 7K3, AND 5C HEADS FOR TALLER SPRING HEIGHT. 1975 High Performance On the 5C to 6X head, 400's & 350's transitioned from their respective chamber size 5C's to 6X's in Feb of 1975. Pairs have ID numbers of 5C, 6S, and 4X Make offer for what you need. Most want the smaller chamber for the 400 for a good CR. 4. Welcome Guest My Account Order Status Wishlist (866)762-7527. O. The 5C heads are some of the better flowing Pontiac heads, and it is a 350 so there is some hope. 00 . 5C-8, 6X-4, 6X-8, and 6H-6 castings. The HO heads have 108 cc chambers and calculates out to 8. MLS gaskets are the ultimate in cylinder sealing. Both are great Pontiac heads but they are quite different. 66. 50:1 SCR, the 220°/226° @ . Personally, am not even impressed with the results of box stock 87 cc E heads on a 462, have witnessed several resulting dyno runs in the 430-440hp range with rpm cam, rpm intake, and swapping on 780-850 dyno Holleys. Pairs have ID numbers of 5C, 6S, and 4X Make offer for what you need Marketplace. Also like the 6X head there is a -4 and -8 version as they used the 5C on the 350 and 400 thus necessitating the need for two combustion chamber volumes. 5C. 1975 No. 2. Edelbrock Performer RPM Cylinder Heads 60599 Cylinder Head, Performer RPM, Aluminum, Assembled, 72cc Chamber, 215cc Intake Runner, Pontiac Check the secondary identifier of the 6X heads to be sure of the chamber size- some were smaller (~93cc) others 400 6X were 101cc. Pontiac made all their The PY Online Forums is the largest online gathering of Pontiac enthusiasts anywhere in the world. 1970 Pontiac 455 cylinder head question. LOOOONG list of new parts and recent maintenance. Will need gone through. $150 $200. (IMO) There is a secondary code on them that needs to be found. Reworked Q Jet, a cast iron EGR intake manifold, along Jmho, have had MANY pair of Pontiac cyl heads prepared through 3 different shops, one being a very well known Pontiac engine builder, and have never paid anywhere near $200 for guide replacement, or $300 for a competition VJspeaking top notch work, just saying, total price, could be quite a bit less. Stampings on Head codes - 51,5C,6X,6S,6H : 2- 101cc's Pontiac heads specifics I guess they would make a great super charged head with such a low 8. 66 valves. 75 stroke crank on 87 octane, and then rebuild it later w/ a 4. The 350, 400 and 455's all had different heads. they cc'd at 88! every reference i've ever seen has them at 72cc. 00 (433 cid) or 4. I am in the middle of figuring out a new build for a 1975 Pontiac Firebird with a 350 PONTIAC engine. one is 1973 clean no crank or accessories $400 one is 1975, together currently w crank and pistons etc, $450 both standard bore 1974 j/k 6x-8 heads off the 75 400 above w rockers etc $140 Since introducing its own cast-aluminum D-port cylinder head for Pontiac applications, KRE has gone on to develop various large-bore Pontiac blocks and highperformance cylinder heads. Int. Pair #5C (8) Heads $425. If the shape is different I will need to figure out how much to mill. 4- 91cc's. The 5C & 6X's are near identical heads & when I had my 6X-400 longblock core deal going ran across a '75 400 with one of each casting style, very close dated, & pulled of original engine with GM head gaskets. So it is The oddest things I've come across is one B of '75 dated 5C-4 on one side, one B of '75 dated 6x-4 on the other side. this number is XXXXX the center of both of these exaust ports on the heads. Thinking about just using my ~100cc 5c-8 heads PONTIAC Cylinder Heads. Cutting exhaust seats to 1. As well as the E-Heads. 77 exhaust flow pretty close the same. 499 posts · Joined 2013 Add to quote; Only show this user #1 Vintage Pontiac heads 3 pairs of heads. On the RA IV the exhaust ports are all 4 round as opposed to the standard vintage Pontiac where the end two ports are ovoid and the center two are D shaped. Also if it sits 1974 400 190 HP YH A 8. . 442 lift, 112LSA)- this cam will improve low end . 213 X 45 Deg. 8- 98cc's. Engine was an early Feb '75 cast 350, & the head gaskets were original GM, as were the freeze plugs. The 6X & 5C heads have factory hardened seats. Some is correct. They are usually stamped on the machined pads by the valve covers. 6 from a 1968 Pontiac Bonneville A 400 6. head Hello folks. Most, if not all '72 D-port heads had 3 digits, with a letter in the middle. $118. 30 over, new sealed power bearings, edelbrock performer intake, ram air iv cam made by edelbrock and lifter kit, Holley 750dp, carter fuel pump, hooker super comp headers and melling high pressure oil pump. Fat Ivan Doorstop. 77) on 5c's. Location: sicklerville nj 08081 Someone has installed a 1975 400 with the 5c heads. As ya'll can tell from the head charts, many Pontiac heads with the same casting # came on different size motors and have different size chambers. 2- 101 cc's. I know the 2. Removed from a 326 with #140 heads. Opens in a new window or tab. Below are some popular heads and chamber sizes (always be sure to have yours checked before any milling). 5C-4's, 5C-9's I am building a pontiac 400. The multiple layers allow for varying degrees of Pontiac 5C Cylinder heads: $250 Came off of a running 1974-75 casting 400. I've got a set of 5C's from my '75 400, or I could pick up a set of 4X's from an older 400 (at the local boneyard). 7- 98cc's. got some 17 heads to replace the 5c/8's so i could raise compression on my 400 build. PONTIAC POWER RULES ! ! ! BACK. D. I pulled these at least ten years ago from a running 400 but I would have them rebuilt so consider them good cores! I don’t see any cracks visually but feel free to inspect them. Moderator: Team. I believe they were used on the 1975 350 and 400 engines. I believe the number for the '72 400's was 7K3. Founded in 1991, it was also the first online forum for people to gather and talk about Volume of 5C 1975 350 Heads: Pontiac - Street 1965 Pontiac V8 Head Bolt Set sold. 8 posts • Page 1 of 1. 30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3. A. Generally, uncut Pontiac heads can be milled at least 0. 66" exhaust to 1. Dave has put in a lot of hours in the last month, inputting data from his own hand ported heads. 92/1. Pontiac factory cast iron heads came with different styles of sealing such as valve stem o-rings and positive locking valve stem seals. I think, with the #62 heads and subsequent increase to 9. Castings: Common 4X, 5C, or 6X. Now the car is really nice and clean and I DO NOT want to change the engine out to a 400. The 6X-8 heads would give you about 3/4 to 1 point less compression on a 400 (about 8:1) than the #94 heads (about 8. This Calculator is designed to tell you how much you need to mill your heads to achieve the . Heads will be going on top of a Pontiac knew how vital cylinder heads are, even back in the 1960s – that’s why its engineers devel-oped so many amazing heads, like the ’68 Ram Air II “96” heads; the “722” and “614” Ram Air IV heads of 1969-70; the “197” or “7F6” HO heads of 1971-72; the “16” SD heads of 1973-74; or, of course, the Cylinder Heads. The smaller exhaust valves don't hurt the flow all that much, and most just Pontiac 5C heads pulled from an early ‘75 Trans Am. 18 Cylinder Head, Performer RPM, Aluminum, Assembled, 72cc Chamber, 215cc Intake Runner, Pontiac, 389-455, Each. 11 Heads 1. 7cc for head gasket, 2cc ring area, and 7. 67 out of 5 stars We get many questions regarding the intake seal styles on cast iron and aftermarket heads. 5 cr stamped O to right denotes HD springs: 1959: 389: 368-373HP: 540306: 1. 00 per pair PONTIAC Cylinder Head Codes This page is part of a frame page. 57 + head cc (assuming 6cc for valve relief, 9. 5C Pontiac - Street PY Online Forums 4X vs. We have a great online selection at the lowest prices with Fast & Free shipping on many items! This is mainly due to the minimum valve bowl diameter in the SBC head being a tad bigger then the Pontiac The 670 heads have the lowest port angle ( not valve inclination angle) of all the 14 degree heads. Afton, OK. mothermuxer. 11" intakes will clear because the 1975 5C heads already have a 2. I think the main purpose would be the air flow comparison between the different heads. and a mild cam. General engine tech -- Drag Racing to Circle Track. Biggest "sleeper" 1975 No. Browse all. On a Pontiac engine the compression ratio's were change by using different heads. March Performance (Westland, MI; 734/729-9079 or 888/729-9070; www. 110 x 5. 25 (460 cid) stroker crank and those same heads will produce 8. Factory A/C upgraded to R134a. Returns; Ordering & Delivery; Payments & Financing; International Shipping; Request Price Match; Contact Us; Builders Just wanted to let everyone know that SD Performance has got their CNC program for 6X and 5c Iron D ports done now. 030” Cometics). Ultimate. 6 compression ratio. “7F6” is the code for a 1972 455 H. the head code,on the heads is"5c". 45 + head cc (this is assuming 6cc for valve relief, 9. But if you intend to keep the stock heads, I'd suggest a summit K2800 (262/272 adv. They are a better candidate for porting if you decide to do that later on. 11" valve from the factory. my_67_camaro New Member Posts: 2 2021 2:24 am. its been around awhile. 060 (add $100-125) then resulting 81-84 cc, big intake valve, screw-in studs. 400 . 50's in a 2,400 lbs. I have 061 heads on my 400 now 73 Ventura, SOLD 455, 3740lbs, 11. The engine has a 3. One Pontiac 5C Head Pick up or can bring to the Pontiac Nationals in Norwalk or Trans Am Nationals in Dayton One Pontiac 5C head - Car Engines & Engine Parts - West Bloomfield Township, Michigan | Facebook Marketplace A 400 6. The area above the two center exhaust ports was a popular location for the casting numbers. Roland Racing offers aftermarket canted-valve Pontiac head castings as both bare heads and assemblies for pre-1980 Pontiac V-8 engines. PERFORMER RPM ALUMINUM . Roland Canted-Valve Pontiac Heads Plus A Scat Stroker Kit Give The Venerable Pontiac V-8 A New Remember Me? Join us now! Menu Pontiac 428/455 stock ,5C heads 2,11-1,66,Castiron intake ,komp 9. But since your date code is June 12 1974, that seems a little early to be putting those heads in a '75. Location. 040 inch; each 0. com) sells a 2111/416-inch Cylinder Head, Performer, Aluminum, Assembled, 87cc Chamber, 204cc Intake Runner, D-Port, Pontiac, Each. Disclaimer: Take these air flow readings with a grain of salt. In our last issue, we began our foray into the world of airflow, as. 5. e. Create new listing. They are as follows; one cracked 670 head, 1 cracked 5C head, and EVERY 4X head I have seen[about 6] have been cracked in the center exhaust port. Alphabetize by year Group by Engines Home 67-69 pontiac 428 head question. Only selling to make room for other engines. Get the best deals for Pontiac 5C Heads at eBay. The 403 is a special block with a bore/stroke of 4. The 6X is the better of them though. 67 out of 5 stars Used pair of Pontiac 5C heads. feffw xgut ynsx gnregzl zuex hbhz afjyogww yawb elevefn uphfir