I would consult a competent engine builder first but to tighten the clearance by .0005 should not take much work. Like David said, carefully sanding the mating surface of the main caps should allow more crush to the inserts. The alternative is leave it as is and run a heavy diesel engine oil like 15w40
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Steve Hayes
"Dust Off"
68 Camaro
Speed has never killed anyone. Suddenly becoming stationary, that's what gets you! "Jeremy Clarkson"
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