calculating compression

[92notch6886]

how do i calculate the compression with a 60cc head?

Compression with a 58cc head is advertised at 10.4:1, 9.7 w/ 64cc head

 

[NIKwoaC]

Compression Ratio=(Clearance Volume+Displacement Volume)/Clearance Volume

Clearance Volume=Cylinder Head Combustion Chamber Volume+Piston Dish Volume+Volume Above Top Piston Ring+Deck Clearance Volume+Gasket Volume