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!
Shipping & Returns
Shipping & Returns
Shipping:
Most qualifying in-stock orders are processed within one business day. In the contiguous 48 states, eligible in-stock orders placed before 12:00 PM (noon) in the customer's local time zone typically ship the same business day. Orders shipping to Alaska or Hawaii use a 12:00 PM Pacific Time cutoff (California time). These cutoffs apply only to eligible in-stock orders and are not guaranteed shipping or delivery times. Same-day shipping refers to processing and carrier handoff, not delivery. Weekends and holidays are excluded.
Payment verification, address verification, fraud review, and inventory availability may take longer. Supplier-direct fulfillment, freight shipping, and special handling may also take longer.
Returns:
Eligible products may be returned within 60 days of delivery, subject to our Return Policy. Return authorization is required. Certain products are final sale or subject to manufacturer warranty procedures, shipping charges, and applicable restocking fees.
Please inspect your order promptly upon delivery. Shipping damage, incorrect items, missing components, or quantity shortages must be reported within 3 business days after delivery. Retain the product, original packaging, shipping labels, and photographs while your claim is reviewed.

