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I thought we were trying to eliminate all this "he could have changed this part or that part" and get down to concrete stuff.
Based on just that I guess we could pretty much have nailed it, but if he's still not satisfied, drop the oil pan and look at the crank's journals. Once the pan is off and if he see's 2 bolt mains, game's up! LT1!
Jake
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The Corvette LT1's had four bolt mains. The F-body, Imapala, Caprice, and Buick Lt1's did have two bolt mains