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FE Technical Forum / Re: measuring compression height on sohc dome piston
« on: September 24, 2025, 08:10:38 PM »
Plug your numbers in here:
https://www.summitracing.com/popup/calcsandtools/compression-calculator
Assuming zero deck height and 0.040" gasket thickness, you get around 12.0:1 with the numbers you provided above

That's assuming the piston dome really does work out to 33 cc.
Color me surprised! That big bore and stroke really do make a difference. Note that you need to enter your piston dome cc as a negative number on the Summit calculator...
https://www.summitracing.com/popup/calcsandtools/compression-calculator
Assuming zero deck height and 0.040" gasket thickness, you get around 12.0:1 with the numbers you provided above


That's assuming the piston dome really does work out to 33 cc.
Color me surprised! That big bore and stroke really do make a difference. Note that you need to enter your piston dome cc as a negative number on the Summit calculator...