I'd like to add my comment here also---we want the pistons when we bore/hone the block as we will fit them to the bore

The mains get align bored/honed to standard size as there is no wear there but the pistons/cylinder walls wear so the motor will take bigger pistons on rebuilding

we do not use CNC machinery as that is about like the factories and is the reason folks like us old timers do it one hole at a time, straight and round---the cnc guys want to do hundreds so often they have hundreds wrong-- this individualized service is what blue printing is all about

we make a lot of money correcting the inexperianced CNC shops work, including many of the online shops work

but---what ever blows your dress up