Reminds me of helping overbore Harley Evo cylinders, during final honing we would take ten inch long feeler gauges with motor oil to stick them together in a stack .0062 thick for a 3.515 inch bore (forged S&S pistons) and push bare pistons through lightly oiled bore to confirm clearance and would go to an .007 stack for a go- no go gauge. It was right when a slow steady push would push it across the .0062 and it would still slide through on a .007 but it would wipe all the oil off one side of bore with thicker gauge.. it still amazes me at how well that technique works, being it is actual clearance measurement when done properly.
