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IMPORTANT NOTICE: Images are for representation purpose only. Actual product size and configuration available may differ from those shown. For specific size and model, please refer to the manufacturer website using MPN (manufacturer part number shown in description).-May be used to convert one-piece rear main seal on 1986 and newer SB Chevy blocks to the old style, two-piece rear seal when installing an old style (pre '86) crank shaft into a newer style ('86-up) block. Billet aluminum adapters come complete with necessary hardware. Available alignment tool allows quick, easy adapter installation. Rear Main Seal Adapter | 1 Piece Block to 2 Piece Crank | 1955-86 Pan Rear Main Seal Adapter Pre-86 Pan 848238017052
Allstar Performance ALL26125 Rear Main Seal Adapter for Early (Pre-86) Oil Pan XUGVP81VQ
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