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Old 12-31-2012, 06:55 AM
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Well with the parts you have posted the cr will be 11.36:1

The 10cc dome on the piston is a mistake for building for pump gas.

If you mean to say it is a -10cc dished piston then the cr will be
a bit on the low side 8.95:1

A better match for the -10cc dished piston for that motor would be to combine with a 58 to 60cc head.
This get the cr to a 92 octane pump gas happy 9.8:1 to 10:1.

Is this what you are wanting to build.?

Camshaft selection: need more info on the car and how you will be using it.
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