Rear Main Bearing Seal: Pontiac- Viton upgrade (V8 59-79) - choose SizeIf your intro an upgraded rear main oil seal for the Pontiac V8 Block.. this is the Viton rear seal. Two Piece seal, a lot better then the Pontiac rope type. 3" Seal fits all 301, 326 350 & 389, & 400 Pontiac engines as well as aftermarket blocks. Only 3" cranks. 3 1 4 Seal fits all 428 thru 455 Pontiac engines as well as aftermarket blocks. Choose 3 Inch or 3. 1 4"
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