Dar is 100% correct. ABC engines are HONED and not lapped with any kind of lapping compound. If you find it in an engine, the manufacturer didn't do it. Lapping, running, disassembling, ultrasonically cleaning and reassembling the number of engines made by a company like OS would add a huge price increase and take forever to make the numbers they make.

I watched a guy ruin a squeaky tight K&B boat engine years ago by putting lapping compound in it. Never turned up after that. He took most of the taper out of the liner. Wouldn't listen to anyone when they told him it was SUPPOSED to be tight at the top.