Cometic C5703-052 MLX Head Gasket 4.165in LHS for GM LSX Gen-4 Race Block V8

Vehicle Fitment

• Universal - for GM LSX Gen-4 aftermarket race block builds (18-bolt head pattern), not a specific factory vehicle

Fitment Notes

• Left Hand Side (driver side) application - order the matching right-hand-side gasket separately for a complete engine build
• Designed specifically for the LSX Bowtie race block; not compatible with production LS1/LS2/LS3/LS7 blocks

Features

• MLX construction with integrated "stopper" layer for optimal combustion chamber sealing
• Improved clamp load around the cylinder without increasing bore distortion
• Multi-layer stainless steel construction for increased strength and durability
• No sealants or re-torquing required
• Built for high-output race and boosted LSX applications

Specifications

• Material: Multi-layer stainless steel (MLX)
• Compressed thickness: 0.052"
• Bore size: 4.165" (105.79mm)
• Position: Left Hand Side (driver side)

Included Components

• 1x Cometic MLX Cylinder Head Gasket (Left Hand Side)

Product Description

The Cometic C5703-052 is a driver-side MLX head gasket purpose-built for GM's LSX Gen-4 aftermarket race block, a purpose-built 18-bolt-head block designed for serious LS-based race and high-horsepower builds beyond what production LS blocks can handle. The MLX design adds an integrated stopper layer that improves combustion chamber sealing and clamp load around the cylinder without increasing bore distortion, a meaningful upgrade for high-cylinder-pressure applications.

At a large 4.165" bore and 0.052" compressed thickness, this gasket suits big-bore LSX race builds running high boost or nitrous, and installs without additional sealants or re-torquing. Since it's a left-side-only gasket, be sure to pair it with the matching right-hand-side part for a complete head gasket set on your LSX race block build.