Internal Balance Chevrolet 2.488 in. Standard Crank Big Block Internal Balance and Small Block Internal Balance 2 Piece Rear Main Seal 139 Tooth, requires special starter pinion drive SFI 29.2 Certified Superior in Strength 0.1875 in. Thick Chromoly Center Blank Hand Fitted and Welded Ring Gear 3 x 10.750 in., 3 x 11.500 in. GM Converter Bolt Patterns Precision Machined, Welded, and Balanced In House

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