My ross pistons for my stroker are .017 in the hole, so i'm going to have the deck milled and the machinist is talking about mocking the pistons up to check how square they are, which is a bit of a pain as it means extra journeys and it got me thinking what amount it could be out. Years ago, i checked one of my old engines with TRW six pack pistons and it was about .003 from lowest to highest.
Mick