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Return to Parts List Category : D- Big Block (Low Deck) : Fasteners : Rear Main Seal Retainer HUG 7359K MAIN SEAL RETAINER KIT BB BILLET ALUM REAR SEAL RETAINER, BOLTS & MAIN SEALS $112.33 Tired of your big block leaking oil from the rear main seal? This is the answer. Our custom made cap features an oil pressure relief area around the inside of the cap that relieves pressure and reduces chance of oil leakage past rear main seal. Plus our detailed illustrated instructions make it so easy, even a Chevy guy could do it. This part number includes a premium Fel-Pro rear main seal, retainer, side seals and bolts.