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Why do you want 11:1 compression? Just curious, be prepair to start blending your fuel, you might need to boost your octane a little (or set your timing back). With 64cc heads, you won't need much of a dome to attain high compression, Summit racing has a tech line you can call. Tell them what heads your'e running and they will give you a part # for the pistons. Valve size and cam lift is critical, you want to make sure you have enough valve to piston clearance.
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