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

Fits 1965-1990 Chevrolet Big Block 396-454. Recommended for use with external vacuum pump.

PART# 1972

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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. Its durability and it's 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 Big Block Mark IV
Product TypeRear Main Seal
Rear Main Seal StyleTwo Piece
WarrantyLimited 90 Day
Part Number1972



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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        Some parts are not legal for use in California or other states with similar regulations.

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