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• Converts one-piece rear main seal on 1986 and newer Small Block Chevy blocks to the old style, two-piece rear seal when installing the old style crankshaft in the newer style blocks
• Available for use with both new style oil pan (1986 and newer blocks with one-piece rear seal), and old style oil pan (pre-1980 blocks with driver-side dipstick)
• Manufactured from billet aluminum
• Includes fasteners
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