440 Compresion Test

Compression tests are only important to determine the eveness of the cylinders. The actual amount of compression is relatively unimportant in a street car. You should be looking for all cylinders to be within 25-35lbs of each other. If one cylinder is 75lbs and the others are 150lbs, then you have a problem. I remember a compression test on a '64 Galaxie 427 side-oiler, compression was 100lbs all cylinders. It ran smooth, good. No problem, the motor was just tired, worn rings, but evenly worn.