Trying to see what my compression ratio is. I still need to cc the 360 heads that are on it they are the 596 heads. At TDC I used a few stacked feeler gauges and a straight edge and I’m coming up with pistons close to 0.100 in the hole. Using the online calc and guessing at 70cc combustion chamber and approx 3 cc for the 4 valve reliefs in the pistons I come up with 7.3:1. Is that typical of 80’s 318’s? I thought 7.5:1 at the very least. Anyone know how thick stock headgaskets were? Perhaps that is contributing?
when I did a compression test before I pulled the heads I had between 133 and 140 psi across the board. Just looking to make some minor improvements and bumping compression with thinner head gaskets and milling the heads might give this motor a little more pep.
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