Exterior Components› Body Panels and Components
Mr. Gasket
Ultra-Seal Header Gaskets Fits 1965-1990 Chevrolet 396-454 Mark IV Big Block Square Port, 1.85 Inch x 1.90 Inch Mr Gasket
SKU: M00S 5910
Beginner — under 30 min
Description
Constructed with a steel core laminate, these gaskets are built to withstand the high heat and pressure common in exhaust systems. The expanded steel core provides stability and maximum torque retention, while the graphite facing offers excellent heat resistance and thermal conductivity.
Fitment
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Specifications
| Brand | Mr. Gasket |
| Part Number | M00S 5910 |
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.
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