For all of your sakes I have taken measurements of all aspects of the engine and included already known specs. The block has been re-surfaced and so has the head.
These measurements are very accurate - I used a graduated cylinder, syringe and measured/remeasured several times. Volume measurements were very consistent. The piston dish volume was measured with the piston installed in the block. It is nearly impossible to accurately measure the piston dish without it being installed.
Piston dish volume (including area around rings) - 9cc
Piston deck height - approx .006 inches (this can vary depending on how much you have removed for resurfacing)
Combustion chamber volume - 46cc
Bore - 3.386 inches (86mm)
Stroke - 3.386 inches (86mm)
Head gasket bore diameter - 3.425 (for an 87mm Cometic)
Gasket thickness - xxxxxxxxxx
Now plug it into something like this and be sure to put the (-) signs where they belong for the Java app:
http://www.csgnetwork.com/compcalc.html
WITH AN 87MM BORE HEAD GASKET, THE HEAD GASKET THICKNESSESS (IN INCHES) BELOW WILL YIELD THE FOLLOWING COMPRESSION RATIOS:
.228mm/.009" = 10:1 (approximate stock HG thickness)
2mm/.079" HG = 8.57:1
3mm/0.118" HG = 7.94:1
NA-T Headgaskets and Compression Ratios
