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Hi John Thank you for the quick reply. I guess my main concern was if the counter rotating 6321 may have had the front of the block modified to accept a gear drive. Secondly if the crankshaft oil hole chamfers as well as the rear main journal may be different due to rotating in the opposite...

Hi I just joined this forum today but sadly have not owned a Corvette for over 15yrs. I do visit this forum often and I hope I can get some info on a couple of motors I just purchased out of an old Hatteras sport fisherman. They are a counter rotating 3916321 and a standard rotation 3904351...