Sale

Exterior Components› Body Panels and Components

Mr. Gasket

Ultra-Seal Header Gaskets Fits 1965-1990 Chevrolet 396-454 Mark IV Big Block Round Ports, 1.92 Inch Mr Gasket

$49.86 $46.09 Save $3.77

SKU: M00S 5911

In Stock
In Stock
Ships by Jul 29
Free Shipping
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Beginner — under 30 min

Description

The Mr. Gasket 5911 is an Ultra Seal exhaust manifold gasket set designed for Chevrolet Big Block Mark IV engines. It features a round port shape with a 1.920-inch diameter and a 0.062-inch thickness. Constructed with a steel core and graphite facing, it offers superior heat resistance and sealing.

This gasket set enhances exhaust flow and performance, suitable for both high-performance and daily driving applications. It can be trimmed to accommodate modified port applications, ensuring a tight seal and maintaining clamp load.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandMr. Gasket
Part NumberM00S 5911

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

View Full Return Policy