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If the engine is on a stand you can measure the volume at BDC and TDC.
I have done this before. Put piston at TDC and fill cylinder and head through spark plug hole with auto trans fluid. Record amount of fluid it takes to fill to plug hole. Put piston at BDC and fill again. Record amount of fluid it takes to fill again. Remember in your math to add the two measurements together then divide by the first measurement. It is not 100% accurate but pretty close. BTW you will have to have engine turned up so plug hole is at highest point.
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