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Apr 29, 2021 · The Pontiac distributors I used had 24 (12x2) in the distributor. The factory set the initial at 6 for a total of 30, but they ran best at 36 (12 initial). The most initial I ever ran on a streetcar was 16.
Aug 19, 2022 · Use the part (engine block or cylinder head) date code to identify the model year. On engine blocks, this code is usually located on the top center of the block, near the distributor. On cylinder heads, it can be "inside" (under the rocker cover) or on the outside. The format of the code is one (1) alphabetic character followed by three (3 ...
Jul 21, 2010 · 12770 posts · Joined 2008. #4 · Jul 22, 2010. 670 heads are one of the most effective heads for making power--they're excellent heads. That said, they are the last of the closed chamber, early style heads with the big valves. They were designed for 100 octane fuel, cheaply and readily available in the '60's.
Pontiac Forums is the premier online community for owners and enthusiasts of Pontiac automobiles. We cover all Pontiac makes and models through every generation.
May 11, 2024 · 923 posts · Joined 2023. #8 · May 11, 2024. The presenter of the full video states that Pontiac was positioned as GM's performance division, January 2024, the Camaro is done, Mopar is not making an ICE super car and there is a void in this segment leaving Mustang with a corner on the market. Using what looks like a licensed Firebird graphic ...
Mar 28, 2009 · the 400 also had better heads, i.e. better valve angle, bigger ports, more flow, bigger valves, screw in studs, guide plates, better combustion chamber. 400 was 1967-up. 389 was 1959-66. if you want to keep the OEM look but upgrade, bore the 389 to 400 CID. have screwed in studs installed the heads.
Aug 28, 2018 · This means #12 heads would be for all RA III applications and for any Firebird or Tempest with the 400 cubic inch V8, manual trans and 4 barrel carb. The #13 head is for 400 cubic inch V8, M40 auto trans with 4 barrel carb used in Firebird, Tempest and Grand Prix.
Mar 24, 2012 · 400 Dyno Test Data with Holley & Q-Jet Comparison. We just finished up the dyno testing of a mildly-built Pontiac 400, and the results follow…. The engine was a 1976 Firebird 400 – the mighty 185-horse with an actual compression ratio of 7.1:1. I basically converted it into a 1967 335-horse (gross rating) GTO configuration with the “670 ...
The Fora platform includes forum software by XenForo. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. A forum community dedicated to Pontiac GTO owners and enthusiasts. Come join the discussion about performance, modifications, troubleshooting, maintenance...
May 21, 2012 · Question for the experts. Regarding the 400 w/YH code: Wallace shows: Year Engine HP Engine code Trans CR Cam Head Code BBL Carb No. Misc. 1974 400 190 HP YH A 8.0 255 4X 1-2 7044066 Block Casting # 481988. 1975 400 170 HP YH A 7.6 266 5C 1-2 7045160 Block Casting # 481988/late 500557.
