Cometic GM Gen II / Mark IV Big Block (396 / 402 / 427) 4.630in Bore .070in MLS-5 Head Gasket
Cometic GM Gen II / Mark IV Big Block (396 / 402 / 427) 4.630in Bore .070in MLS-5 Head Gasket
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Cometic GM Gen II / Mark IV Big Block (396 / 402 / 427) 4.630in Bore .070in MLS-5 Head Gasket
Experience unparalleled performance and reliability with the Cometic GM Gen II / Mark IV Big Block MLS Head Gasket, expertly engineered for high-output engines. Designed specifically for the iconic 396, 402, and 427 cubic inch big blocks, this head gasket delivers exceptional sealing capabilities to keep your engine running smoothly.
Key Features:
- Multi-Layer Steel Construction: Comprised of multiple embossed layers of stainless steel, ensuring maximum strength and durability.
- Viton Rubber Coating: The outer layers feature a Viton rubber coating that withstands extreme temperatures up to 250°C (482°F).
- No Sealants Required: Engineered for optimal sealing performance, these MLS gaskets eliminate the need for additional sealants.
- Versatile Compatibility: Ideal for both aluminum heads to aluminum blocks and aluminum heads to cast iron blocks, handling the shearing forces created by different materials.
- Compressed Thickness: With a compressed operating thickness of just 0.070 inches, it provides a reliable seal without compromising performance.
- Corrosion Resistance: The stainless steel layers are designed to resist corrosion, enhancing the longevity of your engine components.
Benefits:
- Enhances engine performance by providing a superior seal, allowing for optimal compression and efficiency.
- Increases the lifespan of your engine by preventing leaks and reducing wear and tear.
- Streamlined installation process, making it a favorite among DIY enthusiasts and professional mechanics alike.
Use Cases:
- Perfect for high-performance builds where reliable sealing is crucial.
- Recommended for both racing applications and street performance vehicles.
- Suitable for engine rebuilds or upgrades, ensuring a robust seal with every installation.
Unlock the full potential of your GM Gen II or Mark IV big block engine with the Cometic MLS-5 Head Gasket. Upgrade your performance and ensure a reliable seal that stands the test of time!
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Shipping & Returns
Shipping & Returns
📦 Shipping:
Orders are processed within 1–2 business days. Standard delivery takes 3–7 business days, depending on your location.
↩️ Returns:
You may return or exchange products within 60 days of receiving your order. Items must be in original condition with proof of purchase. If your item is defective or damaged due to manufacturing issues, we’ll replace it at no additional cost.

