.0003 is way to tight I'm assuming this is a full floating wrist pin,not press fit is it? ask him how much clearance you have for the rod bushing to the wrist pin and how much between the pistons and wrist pins Also ask about how much end clearances between the end of the wrist pins and the retainers( minimum .001 IMO) The end play should be enough to be felt with your finger stuck into the wrst pin pushing it back and forth while holding the piston in your other hand or in a rod vice