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December 29, 2020 at 7:23 pm
#13625
Participant
most crown heights are measured from the top of the gudgeon pin hole ( check the Matika pistons sight though the do not list MZs ) . This seems to be what is used by most manufacturers , but I have seen tuning manuals where my have measured from the centre of the pin.
hope this is helpful.
Big Bill ( Dunstan )