5/64 & 1/16th ring and max bore size

he has messured the clearance between the piston and the cylinder wall and it,s .003ths.I will find out what the size of the cylinders are, that is why I'm starting to question The direction he whats to go after a 1000K I find it hard to take that it would require a rebore which adds another 600$ to the bill.

Alan