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Mr. Gasket

Mr. Gasket Thermostat Gasket - Bulk Packaged

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

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Manufactured from a blend of nitrile rubber and fiber for excellent sealing and durability. Precision die cut for application.


  • This gasket is bulk packaged
  • 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 Chysler 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
Part Number740

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: See Details

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