I have used various formulas and parameters to calculate the CR and end up with different numbers.

I have a stock shortblock, head volume is 53.4cc and headgasket is Fel-pro 1074. I believe the gasket is .039 in.
The variance comes from the piston volume and deck height. I have seen different values for these in a stock shortblock.
What do you think the CR is? What values do you use for piston volume and deck height?
Thanks for the help.

 

I use piston volume about 5-6cc dish and .025 or so deck height.