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Mr. Gasket Ultra-Seal Valve Cover Gaskets - .312 Inch Thick

Fits 1965-2000 Chevrolet 396-572 Mark IV/V/VI Big Block

PART# 5863

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$36.12   Suggested Retail
$29.26   Holleydays Price
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These are high quality gaskets that works well on those hard to seal applications. The low density fiber & rubber blend gasket material seals those minor head imperfections with a low clamp force. At .312 inch, the extra thickness can also offer slightly more clearance for roller rockers. Ideal for all those high performance applications where you take the valve covers off and on a lot, and sticking is a problem.

Fits all 1965-2000 Chevy Big Blocks: 366,396,402,427,454 including GM (General Motors) Gen VI Crate Engines like the 502 and 572.


  • 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.

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

         X  Holleydays 2020 20% off and DD
         X  Holleydays 2020 20% off and DD