Pontiac 350 heads The nice thing is the 400 and 428 heads will bolt to 350 engine with no problem. 00. 11 intakes with 1. 46's on and parked the stock 5C heads, since the no. 061). 1:1, not 8. 36 shipping. used small-valve No. would pump you up a point to a point half and then a 068 cam The head design was incorporated from the earlier 1970s 350 Pontiac heads, and could satisfy emissions in all states except for high-altitude emissions states and California. You will lose Power with them . They will lower your C/R and them Larger valves are not needed for that Small Bore 350 . The factory comp ratings were with all specs at minimal or nominal, so it sounds like you got the so-called 8. If you prefer to supply different valve springs, valves, retainers, and rocker arm studs, bare cylinder heads are an ideal option. 5 compression or slightly less. 11/1. I don't see you making a lot more power with a stock type head swap. Round (117) Oval (60) D-port (34) SAP (28) Sep 1, 2013 · In the years following after 1973 Pontiac continued bringing down the horsepower figures in line with a tougher exhaust emissions policy, and so doing by 1976 a 350 motor struggled to put out much more than 160 hp in real terms so with cylinder heads chambers of over 100 cc's per chamber and a decreased piston to deck height, compression ratios again were fairly mediocre at 8:1, so whilst the The area above the two center exhaust ports was a popular location for the casting numbers. but it don't matter the heads sell for around $2800. Dec 11, 2018 · Very cool! Back in 1983 I had a 78 Pontiac Grand Prix that started knocking. The 6x-4 350 heads have been very popular for lager cube builds. I have a set of 46 heads, I was wondering what would be a set of good pistons to get. But, beginning in early May of '73, all Pontiac heads had screw-in studs. 66 valves. head, while “13” is a 1970 330-horse (Firebird) or 350-horse (GTO) 400 head. Welcome Guest My Account Order Status Wishlist (866)762-7527. The heads will bolt to ALL traditional Pontiac blocks and do not require you to run any off-set lifters Apr 15, 2014 · The very 1st thing that comes to mind is the fact that the 72cc Hi comp 400 heads from '68-'70 will work real good on a 350 block. 7L/350 Pontiac V8 Cylinder Heads and get Free Shipping on Orders Over $109 at Summit Racing! We have a massive inventory of production Pontiac heads to suit all your restoration and drag racing needs. The 350 or 400 cranks will need modification, the bearing journals are the same size but the width, especially at the thrust surface is different. is a good Jun 12, 2007 · #46 heads Pontiac - Street. Op need some #15 heads , not # 13. 0 out of 5 stars. Makes for a combo on a 455+ cube that will spin a tire but falls on its face quickly due to port choke. 045 gasket thickness, and 5cc valve reliefs, will produce 8. May 3, 2017 · The '69 heads were completely different than the '73-'74 heads. 1965 GTO Cylinder Heads 389 SD 421 Tri-Power 4 Speed Jul 13, 2009 · Because of the short deck, the 301 intake is narrower by nearly an inch over all the other Pontiac intakes. 880" Small bore Dec 1, 2007 · Small-Bore Pontiac Engine Build - Revenge Of The 350. When they did offer a 4-barrel 350 again, they used small valves, such as in the '73-'74 #46 heads. More trouble then it will be worth in my book. Heads. NOTE:" When using a Pontiac 350 block, 1. Heads with casting dates starting around mid-March 1973 to mid-April 1973usually will have screw-in studs. INTAKE MANIFOLD BOLT PATTERN IS THE SAME FOR ALL 65-79 HEADS. We just put a 68 intake and a good qjet on it. Also, the 62-64 will require 65 and up or aftermarket intake and 67 and up pistons with valve pockets for 14-degree heads. is a good Apr 23, 2013 · Agreed, small-valve heads are "better" for a street engine. After 1967 the heads were open chamber heads. $152. Oct 24, 2015 · The guy I bought it from said the heads on the engine were from a Pontiac 350. 11 in and 1. 00 a pair. 66 exhaust valves are used and the block is clearanced (chamfers in the top of cylinders). After looking at the situation I decided to get rid of the 301 heads and put 350 heads on it. 6:1, so the #47's can't be 73 cc 83 cc heads on a 350, assuming . 040 over Casting #62 Heads Flat-Top Pistons 2,500 Stall Torque Converter Melling 444/288 int, 467/298 exh Cam Oversized Ram Air III Factory Headers Edelbrock Performer Intake Edelbrock Performer Series Carb 600 cfm HEI Racing Distributor Taylor High Performance Spark Plug Wires Performer Pontiac heads are designed for 1962-79 389, 400, 421, 428 and 455 cid V8 Pontiac engines with a 4. it occurs inside Pontiac cylinder heads. The resulting compression ratio depending on which chamber size you have. Best 60 ft 1. The bore/stroke ratio of a 350 CI engine is terrible and the block cannot be bored enough to take advantage of the #62 heads that were designed for 400 CI engines. Apr 22, 2011 · 1971 GTO,72 400, stock bottom end, 670 heads, Lunati BMII cam, headers, iron intake Q-jet, four speed. Same block as the 326, 389, 400, 421 & 455. Not a good combo for a 455 with performance in mind. 5 Apr 14, 2008 · 1970 Pontiac Firebird (sold) Current: Pontiac 350 bored . Brand New. They were also used on '77-'79 W72 400's. Pontiac used different valves and combustion chamber size for their V8s to change compression ratios, fuel economy, and horsepower output. Head: Part II . 46 with 3. Heads can be used on your 1965 – 1979 Pontiac motor with displacements from 350 – 455 cid CNC’d combustion chambers available on 74 cc and 85 cc chambered heads CNC ported options of 290, 310, 325 and 340 cfm Oct 31, 2006 · Do some searching on the net. The #47 Heads are 72cc with 196 in and 1. Sep 10, 2019 · It would easily outrun our buddy’s bolt on and geared 90 Mustang Gt. Nov 7, 2024 · I have a set of Pontiac # 46 cylinder heads that were disassembled and thermally washed and cleaned. Jul 30, 2013 · The 6X heads were used on some 350 and 400 Pontiacs. 77" exhaust valves. Or build a 455 w/the stock crank. D-port (25) Round (11) Oval (10 Pontiac Engine Description Cubic Inch Horse Power Idle Type Comp Ratio Foot Notes Complete Engine Long Block ShortBlock__Add Core`Chg; Iron Heads: 350: 325: Lopey: 9. 15 are an 85 CC chamber, 13s are a 72 cc chamber. Mark Dec 9, 2024 · This is our first aluminum Pontiac head casting that we have brought to the marketplace. The #16 was used on '68 heads, and also used on '73-'74 SD455 heads. I would suggest finding a decent 455 to put in your car. is essentially a small Ram Air III and used the same large-valve No. Jul 12, 2008 · A true 1969 350 HO Pontiac had #48 Heads with Screw in Studs 2. 2 days ago · The best Pontiac heads (for example, Pontiac 350 aluminum heads) offered by Edelbrock in the Performer series depend on the vehicle size and application. The small bore of the 350 is restrictive. 0 out of 5 stars Jan 14, 2008 · The mention of a sleeper head is in reference to an HPP article from the mid 90s. Oct 27, 2004 · Well,what makes a 350 and a 400 different is the bore size,stroke is the same,also,about switching heads,know what you have first,by putting heads off a bigger motor you may end up loosing power by dropping the compression due to a larger chamber size. Head Mods. Best 1/8th mile e. Aug 2, 2011 · doing some research into a future build for my GTO. With a light cut on the surface you can bring them down from 92-95ccs to 87cc. Pontiac 1973-1974 Cylinder Heads; No "H" stamp on early 1973 heads. t. They come with hardened steel seats, and bronze alloy guides. 016 deck, . Dust off Your Small-Bore Pontiac, Stroke it to 383 Cubes and Make 460+ HP. Casting Number #16 small valve. 9 4 speed dually Jun 13, 2012 · 73 cc heads would produce a comp ratio of about 9. 5:1, depending, of course, on bore size, deck height, gasket thickness & bore size, and actually combustion chamber size when head is bolted onto block. (All Good). They are basically the same heads that Pontiac used on the '69 350 HO. The Ultimate Head article listed the flow charts for each factory head. I did build a 389 once using standard bore 400 pistons and 65 up heads. Both heads have Ram Air IV exhaust port flanges. Find PONTIAC FIREBIRD 5. Find PONTIAC 5. Sep 23, 2006 · Stock Pontiac Head Specs * During my searching for information, I found quite a few discrepancies in the sources I was viewing. Jun 7, 2016 · E heads on a 350 Pontiac a sure fire very expensive boondoggle. I want the car to be streatable, and to keep the compression reasonable. I have a 400 short block thats needs some machine work, but before I do that. Part Number: EDL-61579 3. And also i cant seem to find the rocker ratio's online if anyone can help me out. The heads are cast from 356-T6 aircraft aluminum and are nearly half the weight of a stock cast iron head. 18 cylinder heads, the '69 350 H. 7L/350 Pontiac V8 Headers and get Free Shipping on Orders Over $109 at Summit Racing! Cylinder Head Port Shape. 87 F350 6. Sep 2, 2021 · Also note those are closed chambered heads and depending on pistons you could be getting up there around 10:75 compression with those heads and also depending on which head gaskets you use. or Best Offer. 5 to 1( if you want to get tight with it) Dec 13, 2010 · While the '68 350 H. Also, the early '73 heads had press-in rocker studs. It should put the CR somewhere between 9:1 and 9. The. The "under-square" (small bore) of the Pontiac 350 severely limits its RPM potential. 5 hp vacuum cleaner motors), two graduated vertical manometers to measure atmospheric pressure, an incline manometer to measure actual airflow, and a velocity probe. 806in 2004. The W72 also featured a camshaft with a higher duration, finer tuned 800cfm Rochester Quadrajet, insulated fuel line, larger 60PSI oil pump, chrome valve covers, a larger May 4, 2018 · 17 heads have a smaller port than other Pontiac heads available. The deck thickness is 5/8" and they sport a new high efficiency heart shaped combustion chamber. Further more, all of these heads have the desirable 2. O. e. mth 67 and up factory Dports are pretty much equal when they are equally in need of rebuilding as any old set would be, its pretty much the same $$$$ to rebuild, port, etc a 46 as it is any other. In our last issue, we began our foray into the world of airflow, as. See: HPP 4X Head Sep 11, 2022 · The 1971 350 block should have the chamfers at the top of the bores for valve clearance. All Pontiac V8 cylinder heads from 1955 to 1976 are essentially interchangeable. Does not have the bolt hole provision for the upper power sterring/alternator bracket for '71-newer. ARP 190-3607 Head Bolt Kit Pontiac 350 400 428 455 1967 & Up with D Port Heads. I had a question regarding Pontiac 46 heads. 46's offered better compression and had been reworked w/ bigger 2. 1967 was a transition year where both open and closed chamber heads were offered, as well as both 20 and 14 degree valve angle heads. . Jul 26, 2010 · Changing the heads on my 72 pontiac 350 for 400 heads. 66" exhaust valves are required. We always wanted to cam one up with some ported heads and see what it would do but it seems Pontiac guys don’t mess with them for some reason. 6:1 heads with your Find PONTIAC 5. Things I am suggesting won't necessarily break the bank but they are not free either. This extra bump in compression will work great with an aftermarket cam that is a bit more aggressive than the stock '71 350 cam. Pontiac 350's are tricky to build with there 3. 5. Pontiac made closed chambered heads until 1967. Mar 11, 2019 · For the next few years, they didn't even offer a 4-barrel 350. “7F6” is the code for a 1972 455 H. 1 C/R Engine . Good 400 CI engines are still available with some diligent searching. There may be a rare occasion that a Pontiac 350 engine will be competitive at the track but I don't see how they can be compared to a Chevrolet 350 "over-square" engine. Open. Look for the secondary identifier (location of code shown below), details on the codes here. 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. 7L/350 Cylinder Heads and get Free Shipping on Orders Over $109 at Summit Racing! Apr 15, 2024 · Find PONTIAC 5. Most any Pontiac cylinder head will work on your 350. 7L/350 Cylinder Heads and get Free Shipping on Orders Over $109 at Summit Racing! Summit Racing SpeedCard - learn how to get 15% back up to $150. Decent head, decent compression. Jul 3, 2015 · I would get the #62 heads. If you prefer a cylinder head that is ready to bolt on your Jan 16, 2021 · The 1970 #13 head uses the most current open chamber design that first appeared on the '67 #061 big Pontiac heads, it also has a 14 degree valve angle. The port shape of the 6X heads are much improved over the #64 and #15 heads and they will respond to porting work better as well. I think, its been a few yrs, that I was ok up to around . ** Use sheet stainless steel block off plate. 72 CC's should put you about the same as the 350 HO 330HP 1969 engine - I believe about 10. The 47 is among the more popular 350 heads. 060" or larger bore. I would have your stock heads rebuilt . 77 valves as well. You Really will not need to Port them Heads for this Build . 66 ex Valves and Pressed in Studs . 1977 350 Pontiac cylinder head casting 6x. 85 cc puts the CR right at 9 to 1 13s are 72 CC , puts the cr at 10. That 350 was stock out of a 72 firebird. Then they switched to 2. Products. This head is available with initial flow numbers around 260 cfm! This heads comes as cast with a 65cc chamber, 74 and 85cc CNC'd chambers are available. 55 open rear 85 Grand Prix, 70 400, casting 62 heads stock rebuild, Turbo 350 trans 78 800 cfm Q-jet modified as per Cliff Ruggles book. In 1967 Pontiac made some open chamber heads (i. some other heads may have screw in studs already but they are 3/8 and you would want to change those to 7/16 if building a power motor, likewise valve replacement, so Jul 15, 2011 · I recently rebuilt a 75 350P for Derrick- we swapped a set of no. There was a little corrosion at the end of one of the heads but should clean up with resurfacing. Both heads were Magnafluxed for cracks. A google search should net you more from the article. I pulled the 301 for a rebuild and didn't realize what a turd that 301 was. For the same coin you can have a stroked 400 w/only the additional cost of a core engine. 66 exhausts. 48 heads and comparative camshaft duration. Chambers. Apr 17, 2013 · The #62 Pontiac heads are among the best 1965-1979 Pontiac heads but you should not waste them on a 350 CI engine. They would give your '71 350 a needed boost in compression, and have bigger 2. 77 ex Valves . Here are the links to several Pontiac head info sites. Dec 18, 2008 · These #64 Heads are great castings but save them for a 400 or 455 build . Mar 26, 2020 · The Pontiac 350, like its 326/389/400/455 cousins responds well to the basic engine upgrades. Will i be able to use the same rocker arms and push rods? I have the rocker arms for the 400 heads but not the push rods. 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. Butler Performance is the main source for stock and performance cylinder heads for your Pontiac. Ultimate. It depends on how much you are willing to spend and how much down time you can endure. Pontiac engineers designed them for a smaller cube motor. Cylinder Head, Performer, Aluminum, Assembled, 87cc Chamber, 204cc Intake Runner, D-Port, Pontiac, Each. $300. You Could run the #47 Heads with a Stock Valve Job and a 0. Over the years Pontiac v8 Cylinder heads came in many specifications. We also service and modify aluminum aftermarket heads, like Edelbrock heads, if you desire. Oct 20, 2009 · Unless the 350 was bored way out or the inside of the cylinder was cut to except large valves the valves would hit the deck of the 350Are you sure it was a 350. 10 Cut to the Heads True 9. 7L/350 Headers and get Free Shipping on Orders Over $109 at Summit Racing! Cylinder Head Port Shape. May 4, 2010 · Head choices for a 326 Pontiac - Street Remember Me? 350 heads are the wrong valve angle and waaayy bigger chambers that a 389 head. Happy Motoring. Jul 3, 2024 · Find many great new & used options and get the best deals for 1974 Firebird Pontiac 46 Head E304 Pontiac 350 V8 Heads Pair GM at the best online prices at eBay! Free shipping for many products! Apr 23, 2013 · Agreed, small-valve heads are "better" for a street engine. Yank the stocker and keep it for posterity. 11" intake and 1. Feb 18, 2013 · You cannot even bore a Pontiac 350 engine so it will accept high performance heads. Installing a 4-bbl. So I have done a little research and the head stamped 17 are from a 350, and supposed to have 80 cc chambers on them . 3:1 compression. Pre-Owned · Pontiac. The pistons will be flat tops. Opens in a new window or tab. 500 lift. 6:1 CR then I would do no more than a oem #066 cam to swap in with 4 barrel etc. Mar 9, 2010 · 350 heads won't support a large displacement, so heads will also be needed. Mike Apr 10, 2023 · However if I was spending the dough to rebuild a set of heads I’d opt for some 6X-4 350/W72 400 heads. There have been lots Oct 23, 2020 · I would say 300 horse is easy on a 350 Pontiac. We were armed with a 400-cfm laminar flow element (powered by six 1. Thanks. 8. common 2 barrel 68-69 350 Oct 5, 2021 · If your not swapping heads to improve the factory rated 7. Best thing would be to grab some other small valve heads with smaller chambers that have all the exhaust bolt holes like common 68 #17 350 heads. 3 ish to 1 The 15 heads can be milled to 80-82 CC easily and will put the CR right at 9. the #16 heads came on firebirds and GTO. Dec 20, 2020 · Andy - if you are looking for something in the 72-75cc range, here are a list of Pontiac heads to look for. Can be used with 350 engine if 1. You can bolt the heads from any other Pontiac on but you'll need to make your own intake. 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. A bracket can be fashioned (seen in Jim Hand's book) without great difficulty. The 5C flowed a little better than most heads, albeit only a few CFM, but they are certainly not junk. kivvom aigycm jky plvtt hutfqiq lqmoztt gossv dmjsdgoy glmmsv mfanm