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11:1 + supercharged = hope your gonna run propane
you'll need somebody like Willymammoth to make the efi work on the 20R head
exhaust side is a direct bolt on my motor had like 10:1 and when running the 87 and pulling a load, it detonated to much and killed my piston thats what bigmike said anyway, and it had something very bad happeneing in there
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