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This V-6 head has been milled with three different chamber sizes; from left to right, they are 57, 77, and 87 cc for corresponding compression ratios of 13.53:1, 10.31:1, and 8.56:1. Also note the clear plastic cover that is used when determining chamber size. With the cover in place, an indexed burette is filled with fluid that is fed into the chamber--the index marks indicate the amount of fluid that has flown out of the burette, which tells you the volume of the chamber. View Related Article
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