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12.5 : 1 compression question

Old 06-09-2019, 10:16 AM
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Originally Posted by jojo DaCosta View Post
12? Dude the 70 Chevelle SS had 12.5 to 1, ZL had the same, you know nothing kid.
70 Chevelle SS had 11:1. ZL1 had 12:1 but so what? Those cars were meant for the "Super" of the era which I believe was an honest 98-102 octane.

Why run that much compression on the street? Most of your ignition map will be knock limited, and for what? Bragging rights?

Street car V8 with big bores, I would say 11-11.3:1 will be safe and comfortable. Any more, you are compromising one area for small gains in another, which is like the antithesis of a true street car.

And yes, the preposterousness of waking up a 17 year old thread just dawned on me!
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