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Cometic C5474-040 LS .040" MLS Head Gaskets (Pair) | 3.910" Bore | Fits 1999-2013 4.8L 5.3L 5.7L LS1 LS6 LM7 L33 LC9 LS4 LMG LMF L20 | Multi-Layer Steel Gaskets for Maximum Sealing in Saudi Arabia Cometic C5474-040 LS .040" MLS Head Gaskets (Pair) | 3.910" Bore | Fits 1999-2013 4.8L 5.3L 5.7L LS1 LS6 LM7 L33 LC9 LS4 LMG LMF L20 | Multi-Layer Steel Gaskets for Maximum Sealing in Saudi Arabia Cometic C5474-040 LS .040" MLS Head Gaskets (Pair) | 3.910" Bore | Fits 1999-2013 4.8L 5.3L 5.7L LS1 LS6 LM7 L33 LC9 LS4 LMG LMF L20 | Multi-Layer Steel Gaskets for Maximum Sealing in Saudi Arabia Cometic C5474-040 LS .040" MLS Head Gaskets (Pair) | 3.910" Bore | Fits 1999-2013 4.8L 5.3L 5.7L LS1 LS6 LM7 L33 LC9 LS4 LMG LMF L20 | Multi-Layer Steel Gaskets for Maximum Sealing in Saudi Arabia Cometic C5474-040 LS .040" MLS Head Gaskets (Pair) | 3.910" Bore | Fits 1999-2013 4.8L 5.3L 5.7L LS1 LS6 LM7 L33 LC9 LS4 LMG LMF L20 | Multi-Layer Steel Gaskets for Maximum Sealing in Saudi Arabia

Cometic C5474-040 LS .040" MLS Head Gaskets (Pair) | 3.910" Bore | Fits 1999-2013 4.8L 5.3L 5.7L LS1 LS6 LM7 L33 LC9 LS4 LMG LMF L20 | Multi-Layer Steel Gaskets for Maximum Sealing

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Special Features

  • Sold as a Pair (2 Gaskets): Includes two Cometic C5475-040 head gaskets—perfect for completing both banks of your LS-based V8 rebuild or high-performance engine build.
  • Premium Multi-Layer Steel Construction: Built using Cometic's proven MLS design that maintains consistent combustion sealing under high compression, boost, and extreme temperature cycles.
  • Precision 3.910” Bore & .040” Thickness: Engineered to match factory specifications for LS1, LS6, and 4.8–5.7L engines, ensuring proper compression and flawless head-to-block sealing.
  • Built for Boosted and High RPM Applications: Handles the intense cylinder pressures of forced induction or naturally aspirated performance engines with no sealing compromise.
  • Wide LS Compatibility: Fits 1999–2013 GM 4.8L, 5.3L, and 5.7L LS engines including LS1, LS6, LM7, LR4, L59, L33, LC9, LS4, LMG, LMF, and L20 platforms—ideal for rebuilds or upgrades.

Description

This pair of Cometic C5475-040 LS Head Gaskets delivers industry-leading sealing performance and durability for all 4.8L, 5.3L, and 5.7L LS-based engines from 1999–2013. Featuring a 3.910” bore and .040” compressed thickness, these MLS gaskets are built to handle extreme combustion pressures, high heat, and boosted applications. Each gasket utilizes Cometic's precision multi-layer steel (MLS) technology for unmatched strength and consistent sealing between the block and heads. Whether you're building an LS1 Camaro, LS6 Corvette, or a boosted LM7 truck motor, this set of two gaskets ensures both cylinder banks are sealed tight, providing the performance, reliability, and confidence expected from Cometic.

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