64imperial

Maybe you've misunderstood your machine shop, they should bore the engine and THEY will tell YOU what size pistons to order. Then they will finish up the machine work when the pistons have arrived. Say you mic your own cylinders and believe a .010 over piston is adequate. BUT the machine shop needs to take it to .020 over because of scoring on the cylinder walls. You can't possibly pre-determine or even see minute scoring. You can't know the piston size you need until the machine shop begins the process. Let the pros do their job with their proper tools (internal bore mics, etc) and if they've misadvised you, go to a better machine shop. Spend more money now at a quality machine shop rather than doing it twice for 3 or 4 times as much after correcting poor work and ordering wrong parts.