I just ordered a set of AFR 58cc heads. Knowing that the factory compression is 9.2:1, and the factory heads are around 63-65cc's, what will my compression be with the 58cc head, and what will it be with the heads milled to 54cc's? The guys at AFR told me that with 58cc's it would be close to 10:1, and with 54cc's it would be 10.5 to one. Others are telling me it will be close to 9.6:1 and 9.9:1 respectively. Anyone know? And what kinds of HP increases are associated with a bump in compression of say 1 point?
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