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Gm advises .001, to .003. If it is going to be a 150,000 mile motor, I go to the tight side of .001. Race motors go to about .002, to .0025. They are more "loose" and rev better. The person that regrinds the crankshaft, controls this. You have to tell him in advance. Remember, "looser" tolerances will need a high volume, as well as high pressure pump, to keep a good pressure level with the larger clearance. The big block Chevy pump works great.

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13y ago

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