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Originally Posted by 1965gp
This is good to hear- looks like I am going to be building a 400 for my 66 GTO. I have a few head options- 48, 62, and 6X off the TA 6.6 motor.
Which heads do you suggest?
I agree that stock-ish is probably the way to go.
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If you’re starting a fresh engine build I’d choose one of the two high compression 400 heads (the #48s are good) and then use the piston dish to determine your final compression ratio.
Choose your compression ratio wisely. Your choice should take into consideration what fuel you have available, what type of transmission you plan to use (what torque converter if auto transmission), rear end gearing and what camshaft you plan to run. Put the pistons at or very close to zero deck and use a .039” to .045” head gasket.
Hard to go wrong with a conservative 9.3:1 compression ratio which should be easily and safely compatible with most 91-93 octane pump fuel. If you’re feeling a bit nostalgic running the tried and true 068 Tri-Power cam might be a good option.