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COMP Cams also sells a "sportsman" and a "professional" head CC'ing kit. The pro kit has a glass burette with a stand as well as a block-off plate to seal the head. A light smear of grease around the chamber keeps the measuring fluid (denatured alcohol ideally) from seeping out and skewing the reading. With the chamber measurement you can now use a calculator and your gray matter to find the true compression ratio.