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.
Features:
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
Specs
Application
Big Block Chevy
Brand
Mr. Gasket
Color
Black
Emission Code
5
Engine
Chevrolet Big Block Gen V/VI
Chevrolet Big Block Mark IV
Finish
Rubber coated
Packaging
Retail - Skin Pack
Product Type
Valve Cover Accessories
Valve Cover Gasket Material
Ultra Seal
Valve Cover Gasket Thickness
.312"
Warranty
Limited 90 Day Warranty
Weight
0.5000
Part Number
5863
Emissions
5
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.
