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  1. 1964-1974 Tempest/LeMans/GTO Engine Tuning
    Let's see /hear what everyone is running between those heads. I opted for a Comp Cams XE274H. Engine stats: 67 WT 406 Port and polished Holley 850 Edelbrock Performer Rpm Butler CC XE274 hyd flat tap Dougs Headers All work performed by a phenomenal builder in VA.
  2. 1964-1974 Tempest/LeMans/GTO Engine Tuning
    I'm having concerns with compression ratio limits to '69 #62 heads off a 428. So I bought a '70 400 to build and throw into a '68 Tempest. I was told the motor was stuck, but have found it's actually .30 over with new pistons, cam, timing chain, and crank. The heads are press in stud #16(I have...
  3. 1964-1974 Tempest, Lemans & GTO General Discussion
    Hello everyone. I recently purchased a 1967 GTO. The car originally had a 400ci with 335 hp “YS” code with an automatic transmission. However it now has a 455ci the engine based on the numbers next to the timing cover (starting with 22P) it was originally in a 1972 Pontiac. This 455ci has “YC”...
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