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Old 09-19-2003, 12:43 AM
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compression ratio on blown sbc?

I'm running a B&M 250 on a 355 sbc and have finally found some decently priced Aluminum heads (AFR 190's 74cc) and have calculated that I will end up with slightly under 8.4:1. Now I understand the aluminum heads can tolerate a little more compression before detonating etc so this would be equivalent to iron heads at 8:1 or less. I've heard some engine builders allow a full point extra compression when building aluminum head engines. My question is is this compression ratio acceptable running less than 10 lbs on 92 octane fuel?

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Old 09-19-2003, 12:58 PM
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Id say with alluminum heads and 8.4-1 compression, you should be okay with around 8lbs of boost and 92-94 octane. They say alluminum is good for another comp point, so it would be like running 7.4-1 in your motor. HG
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Old 09-19-2003, 01:09 PM
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Thanks, that's what I was lead to believe.
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