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Mr. Gasket

Mr. Gasket Performance Thermostat Gasket

Fits 1965-1990 396-454 Big Block Chevrolet - 1955-1992 262-400 Small Block Chevrolet - 1979-1982 318/360 Small Block Mopar - 1992-2003 3.9L/5.2L/5.9L Magnum

Part # 740C Be the first to write a review
Estimated shipping date: 01/24/2022
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This is a high quality gasket that will seal that leaking water neck, and provide you with years of service. This gasket works well in all applications.


  • Made From Cellulose/Nitrile Composition
  • Provides Excellent Sealing And Durability
  • These Gaskets Are Die Cut For a Precision Fit
  • Fits Small Block Chevy V8 Engines 1955-'90
  • Fits Big Block Chevy V8 Engines 1965-'90
  • Fits Small Block Chrysler 318/360 1979-'92
  • Fits Small Block Chrysler 3.9L/5.2L/5.9L Magnum 1992-'03

About Mr. Gasket

Using his own '57 Chevy as a rolling testbed, drag racer Joe Hrudka launched the most famous gasket company in the world more than half a century ago. Mr. Gasket is the go-to gasket source for racers with gaskets and fasteners that seal perfectly every time.

Brand Mr. Gasket
Emission Code5
EngineChevrolet Big Block Mark IV
Chevrolet Small Block Gen I
Chrysler Small Block LA
Chrysler Small Block Magnum
Product TypeThermostat Housing Gasket
WarrantyLimited 90 Day Warranty
Part Number740C

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.

Limited 90 Day Warranty: See Details

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