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Old 02-03-2013, 04:10 PM
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You cn do it all yourself.
Here is a free download compression ratio calc.
Download Free Compression Ratio Calculator, Compression Ratio Calculator 1.0 Download

You need to know the cylinder head cc and the piston to deck clearance @ TDC

Generally (based on a 0 deck height) 383 with a 64cc head wants a -12cc dish

a 70-72cc head can use a 383 flat top piston.
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