Breathing new life into the 318 in the Scamp!

The caliper has a bladed edge on the internal and external jaw, toward the end. I think this caliper's internal jaw is off, though, because it doesn't look zero or feel zero with my feeler gauge when the external jaw is shut.

I like your idea, though. I'm beginning to wonder if this had to do with some fluke situation, either in oiling or with this lifter having that crater. I really don't want to spend the money on a lifter bore broach for one bore, especially if it's not the cause of the problem.

I may try your trick out. Maybe I can cut it to .905" total with radiused ends and call it good. All I'm really looking for is a tight spot, so that would tell me. If it's loose/ at an angle it's all the same and won't cause it to grab. 906" would be too much I think.

The only thing that wont tell me is how true the bore is (tight wall spot opposing loose wall spot), but it's a start.

When I put the new lifter in, I'm going to check the bore with a light and mirror for contamination, burring or anything odd.