Thermostat Gasket - Small Block Chevy and Big Block Chevy V8 Engines

Thermostat Gasket Fits: Big Block Chevy - 1965-1990 - 396-454 Small Block Chevy 1955-1991 - 262-400 Small Block Mopar - 1979-'92 318/360 Small Block Mopar - 1992-'03 3.9L/5.2L/5.9L Magnum

PART# 740C

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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


BrandMr. Gasket
Emission Code1
EngineChevrolet Big Block Mark IV
Chevrolet Small Block Gen I
Chrysler Small Block LA
Chrysler Small Block Magnum
Product TypeWater Neck Gaskets
WarrantyLimited 90 Day Warranty
Part Number740C


This part is legal for use on Emissions Controlled Vehicles when used in accordance with the manufacturers application guide because it has a California Air Resources Board Executive Order number or is a direct or consolidated replacement part.

The following vehicles are considered Emissions Controlled Vehicles:

  • 1966 and newer U.S. manufactured California Certified vehicles
  • 1968 and newer U.S. manufactured Federally Certified vehicles
  • 1968 and newer Foreign manufactured vehicle

Warranty Information

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.