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1965-1990 Big block header gaskets

Item EK-61-878144-1
38 Reviews of Mr. Gasket
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$47.00

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      Product Information

      Features, Description, Q&A

      Features

      • Fits 1965-1990 Chevrolet 396-454 Mark IV Big Block Round Ports 2.40 Inch
      • Manufactured From High-Temperature Steel Core With Graphite Facing
      • Expanded Steel Core Provides Stability And Maximum Torque Retention To Help Prevent Gasket Failure
      • Graphite Facing Offers Excellent Heat Resistance And Thermal Conductivity To Transfer Heat Away From The Cylinder Head
      • Conforms To And Seals Minor Surface Irregularities For A Reliable Seal
      • High Recovery Material Allows Header Or Manifold Flange To Stay Sealed Even If Clamp-Load Is Lost
      • Can Be Trimmed If Necessary For Modified Port Applications
      • Intended For Original Equipment Replacement, High Performance Street, Drag Race, And Oval Track Use
        • Fit 1965-1990 Chevrolet Big Block Mark IV Engines With Round 2.40 Inch Ports Only

      Description

      Premium Exhaust Sealing. The Mr. Gasket 1965-1990 Big Block Header Gaskets provide reliable exhaust sealing specifically designed for Chevrolet Big Block Mark IV engines. They create a secure seal between the cylinder heads and headers or manifolds, preventing exhaust leaks that could negatively affect engine performance and efficiency. This gasket is essential for maintaining exhaust system integrity in both high performance and street applications.

      Durable Construction. Crafted with a high-temperature steel core combined with a graphite facing, these gaskets deliver excellent heat resistance and thermal conductivity. The expanded steel core enhances stability and torque retention, while the graphite facing aids in transferring heat away from the cylinder head. The material conforms to minor port surface imperfections and ensures a durable, long-lasting seal. Additionally, these gaskets can be trimmed to accommodate custom port modifications.

      Installation. Designed to fit existing port dimensions without requiring drilling or modifications, installation is straightforward. The gasket maintains a strong seal even if the flange clamp load becomes reduced, minimizing the risk of exhaust leaks after installation.

      Warranty. This product comes with a manufacturer’s limited 90-day warranty.

      Application. Fits Chevrolet and GMC Big Block Mark IV engines from 1965 to 1990 with 396 to 454 cubic inches and round 2.40 inch ports. It is not suitable for engines outside this port size or vehicle range.

      CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

      4.5

      Reviews of Mr. Gasket Classic Engine Products (38)

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