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The right way to measure combustion- chamber volume is to invert the head on a workbench and install a pair of valves and a spark plug in the chamber. Use a piece of acrylic plastic that will more than cover the size of the chamber with a 1/4- or 3/8-inch hole drilled in it. Then you can use a colored liquid (blue food coloring in rubbing alcohol works well) to fill the chamber from a graduated cylinder or burette. Powerhouse sells an inexpensive kit using a plastic graduated cylinder that works if you’re careful. The 100-milliliter burette is more accurate (1 milliliter = 1 cubic centimeter) but is much more expensive. View Related Article
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