I haven’t been able to locate a tool for accurately and easily gauging the thickness of the pushrod pinch area of the intake port. In order to accurately know the thickness of the intake port at the pushrod pinch-point, I modified a 4” caliper so I can immediately see the thickness between the two areas. This should help prevent from accidentally grinding through the port wall into the pushrod channel. Measurements can be taken from the top of the port to the bottom. It’s a big help. I may try to make it so the caliper fingers clamp on instead of being welded.