Measuring combustion chamber volume

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One very important aspect of a cylinder head is the compression ratio (CR) that it will result in. Of course, the compression ratio can be adjusted by adding or removing gaskets but this will also affect the squish clearance, which may not be desirable. When optimizing a cylinder head, gaskets should be selected to produce the desired squish clearance, the combustion chamber volume should be measured and the CR calculated, and then the head can be modified or replaced if the CR is too high or too low.