1976 pontiac 6x heads. com. Sep 23, 2006 · Ron's Pontiac Page: Stock Pontiac Head Specs Aug 8, 2019 · It is in Norwalk OH. Once you identify the heads and block by Bill's pics, let us know what you want it "to do". . Jim Q: Should I upgrade Pontiac 6X heads? Absolutely. 500 lb ft of torque is doable. 6 55-60 INT MAN 538177 61-62 389 62 D-Port 1. 660" As cast 100cc Location Farmington NY 14425 In 1973 Pontiac started stamping extra numbers (1/4" tall) on their heads. Get the best deals for Pontiac 6X Heads at eBay. Massive selection from top brands on eBay. Both heads show a casting date of L226. Here is the strange part. 500 hp will be a challenge for a street engine. Good for compression bump on your 455 build Bought some new Comp Cams valves and Performed leaks tests, it passed so I just left the heads alone as is. We have a great online selection at the lowest prices with Fast & Free shipping on many items! Jul 16, 2013 · 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. Casting number and date code are in the pictures. The 6X heads are good for that. What should a guy look for on these heads, advantages-disadvantages? Thanks, jake Click Here for Edelbrock Aluminum Head Installation Sheet PONTIAC HEAD CHART CASTING NUMBER YEAR FACTORY APPLICATION CHAMBER VOL# CC'S EXHAUST PORT NOTEWORTHY ATTRIBUTES 528511 1958 370 62 D-Port 1. Both show a day shift indicator. The 1962 and 1963 Super Duty engines would work well also. Then the best option would be to choose a high output Pontiac heads produced from 1967 on. Excluding the Ra Jul 30, 2013 · The most noticeable and "fun" gains for a car like yours will come from increasing low-end and mid-range torque. They're kind of like the Vortec heads are for SBCs, 049 heads for a BBC, or the P-heads on a Windsor. Sold as cores. Shop Genuine OEM Car & Truck Cylinder Heads for Pontiac with eBay Guaranteed Fit. However, they are harder to find and like the 1967 heads, they have a closed combustion chamber. 74 cc chamber volume. 6L/400 Cylinder Heads In Stock Filter Options, Vendor In Stock Filter Options and get Free Shipping on Orders Over $109 at Summit Racing! Save More Description 400 Pontiac 6X-8 Pair Cyl Heads Fits 455 Date L106 so year is 1976 This is a set of used Pontiac cast iron heads with D port exhaust. 88/1. The 6X is the better of them though. 500 hp is a pretty stout 400 cid pontiac motor. They are usually stamped on the machined pads by the valve covers. Local pickup in Harborcreek 1976 Pontiac 400 Block and 6X Heads, XS code 170hp originally. Which would indicate Dec 22 1976. I would play to the pontiac engines strength, which is torque. However on the driver side head the vertical boss is stamped 4 Jul 5, 2008 · Came across a set of these and was wondering how good of a head are they. We have a great online selection at the lowest prices with Fast & Free shipping on many items! There are aftermarket heads available but, If you don’t want to use aftermarket heads. Great deals. I 6X set of heads ID stamp 4 came off a running and driving 1976 Pontiac 350 so the 93. 110" and 1. i will have them machined and ported and dressed with all new aftermarket spings and rockers. Founded in 1991, it was also the first online forum for people to gather and talk about their Pontiacs. with haeds would make more hp and tourqe 670 or 6x. Casting 6X Dates L106 Original valve size 2. Jul 11, 2024 · 6X heads are the go-to for a mild performance head on Pontiacs. There are a handful of SERIOUS Pontiac guys here. The 6X heads weren't produced until 1976, 4X were 73/74 heads. Having said that, they came in two different chamber sizes - big and huge to match the 455 cubes they were usually used on. Most want the smaller chamber for the 400 for a good CR. (IMO) There is a secondary code on them that needs to be found. Pontiac Head ID Aug 31, 2016 · So, I picked up two 6x casting code heads with a bunch of other spare parts with my 66 GTO. We can help. i have a mild cam and an edlebrook performer rpm intake Get the best deals for Pontiac 6X Cylinder Heads at eBay. Upgrading (porting, larger valves, better valve seats) can significantly improve their airflow and power output, helping you achieve much better performance than stock heads. A friend of mine is building a 67 firebird with a 400 pontiac so hes wondering these heads can support up to 500 horse. com Dec 29, 2001 · The PY Online Forums is the largest online gathering of Pontiac enthusiasts anywhere in the world. These head numbers represented chamber sizes. Different chamber volumes, some huge for 455 engines and some small for 350 cid. Find 1976 PONTIAC 6. 88 May 7, 2010 · i am building a 400 for my 67 lemans and i would like to get some advice on a head choice. If the 73 block is still stock, you might have dished pistons which means your compression is super low. znh bbr ubd akc vtc glz yno fop qdb qni lix eiu gwi bho fsp