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Mr. Gasket Rear Main Seal - Viton® - High Vacuum

Fits Chevrolet Small Block with two-piece rear main seal. Recommended for use with external vacuum pump.

PART# 1971

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This Mr. Gasket Rear Main Seal is made from Viton® Rubber. This style of rubber can handle high temperature like silicone rubber, but with superior abrasion resistance. It's durability and design make it recommended for applications that have high engine vacuum, like racing engines that utilize external vacuum pumps for crankcase evacuation.


  • Repairs That Leaky Rear Main Sail
  • Viton® Rubber Offers Both Abrasion Resistance & High Temperature Tolerance
  • Upgrade for Rope Seal Equipped Cars or Silicone Rubber Main Seals


BrandMr. Gasket
Emission Code5
EngineChevrolet Small Block Gen I
Product TypeRear Main Seal
Rear Main Seal StyleTwo Piece
WarrantyLimited 90 Day
Part Number1971



This part is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.

Warranty Information

Limited 90 Day: See Details


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