depends... aluminum heads allow more compression, combustion chamber shape makes a diference... cam makes all the difference, its the DCR that determines what octane you need....
11:1 on an ls engine... yes..
11:1 on a mild cam, ironheaded SBC... not so much
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Elwood:We're 105 miles from Chicago, we have a full tank of gas, half pack of cigarettes, it's dark out and we're wearing sunglasses.
Jake: Hit it.
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