Mr. Gasket Ultra-Seal Valve Cover Gaskets

Fits 1965-2000 Chevrolet 396-454 Mark IV/V/VI Big Block

PART# 5863

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This is a high quality gasket that works well on those hard to seal applications, the extra thickness and rubber coating helps to seal those minor head imperfections. These gaskets are ideal for all those high performance applications where you take the valve covers off and on a lot, and sticking is a problem.


  • These Are A Cork Rubber Blend
  • Extra Thick 5/16 In Creates Positive Seal
  • Also Available In Standard Thickness
  • For OE Replacement And High Performance Apps


ApplicationBig Block Chevy
BrandMr. Gasket
Emission Code5
EngineChevrolet Big Block Gen V/VI
Chevrolet Big Block Mark IV
FinishRubber coated
PackagingRetail - Skin Pack
Product TypeValve Cover Accessories
Valve Cover Gasket MaterialUltra Seal
Valve Cover Gasket Thickness.312"
WarrantyLimited 90 Day Warranty
Part Number5863


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 Warranty: See Details


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        *Free Shipping & Handling only offered to the contiguous US on orders over $100, excludes clearance parts and oversized packages.

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