Bore x Bore x Stroke x .7854 = Cylinder Volume = V1
Bore x Bore x Deck Clearance x .7854 =Clearance Volume = V2
Bore x Bore x Head Gasket Thickness x .7854 = Gasket Volume = V3
Combustion Chamber CC's x .061 = Combustion Chamber CI = V4
Assuming your engine is otherwise stock your C/R should be about 11.3:1. 210 psi on a compression test is fairly decent. have you checked all 4 cylinders to see how close they are?
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