Hi. It's been awhile since I've posted (that's almost an old song).anyway, I'm getting a 440 ready to pull from a car and sell it (the motor). I want to do a compression test and post it along with the video I shot of the motor running, to assure a buyer that they are getting a good motor. I don't have a compression tester anymore, so was going to see if NAPA has one they will rent. If not, I'll buy one. BUT, when I look at the testers online, they all say they will fit "MM" size spark plug holes. Is this going to work with a 1967 440 or do I need something in an SAE measurement?
Thanks,
Butch