Join Date: Aug 1998
Location: Waldorf Md. USA
Re: Bore to piston tolerances, crankshaft etc.
I would like to make 2 comments.
1. Most people still do not understand this but . . . the actual clearance is designed into the piston. You finish the block to the exact bore size. The piston will be smaller by whatever the clearance is supposed to be. For instance if you have a forged piston that is supposed to run at .005" clearance, the piston will actually measure .005" smaller than the bore size. So your .080" oversize piston will actually measure .075", or .078" etc depending on the clearance.
2. I would not be a bit concerned with boring that block .080" oversize. Unless you are going to race it exclusively or run a blower and nitrous, I dont think you will have any problems. On a STOCK TYPE engine, my rule of thumb is that if they make pistons the size you want, then it is ok to bore it to that size. If you really are a chicken, then get it sonic tested, but I dont think you will have any problems.
Just my opinion,
Advanced Automotive Machine
1971 Chevelle "Heavy Chevy" original owner
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