Just wondering how I would be able to calculate the compression ratio for my motor? I have a "crate" motor that we bought form a Buick dealership in 1981, and the heads have been worked on, but I'm not sure if they had to be resurfaced or not, when they were being rebuilt. I'm interested to know if the compression ration has changed from any work done to them, but have no idea how to measure the compression ratio, as opposed to how much compression each cylinder has.
You would need cylinder head chamber volume, piston dish/dome volume, head gasket diameter and thickness, and bore diameter. If you have these numbers, I have a calculator that can figure it out.
