What is the correct code for stage 1 heads for 70', 71, or 72 skylark? I have a 72 and it runs stronger than any other classic car i've ever had. I had a 70 chevelle with orig. 350, and I really don't think it could touch the buick in a ¼ 0r ½ mile.BUt as far as I can tell, nothing has ever been removed. I just want to know if my heads are different

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½nuts

by the way, it is a 350 w/350th trans. It came factory w/single exhaust, but a dual exhaust cross member. Built in Flint

Stage One heads were only available on the 455 engine. Your 350 is just a strong running Buick motor.

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Steve B.
GSCA #2173 (1986)
67 GS 525 Stg IV
66 GS Convertible
65 GS HT
63 Riv