Cometic C15503-040 GM LSX Small Block MLX Cylinder Head Gasket Bore - Gen-4 V8 4.165

The Cometic C15503-040 is a high-performance Multi-Layer Stopper (MLX) cylinder head gasket engineered specifically for GM LSX Generation 4 small block V8 engines. This gasket features a compressed thickness of .040 inches (1.02mm) and a 4.165-inch bore diameter, making it ideal for performance builds requiring precise combustion sealing.

Key Features:

• Multi-Layer Stopper (MLX) construction provides superior sealing and durability under high-performance conditions
• 4.165-inch bore diameter accommodates standard and slightly overbored LSX cylinders
• .040-inch compressed thickness allows for precise compression ratio tuning
• Compatible with both 1/2-inch and 3/8-inch head studs for versatile installation options
• Designed for RHS (Racing Head Service) cylinder heads and compatible LSX applications
• Manufactured from premium materials for exceptional heat and pressure resistance

Cometic MLX gaskets feature multiple layers of stainless steel with integrated stopper layers that provide additional support around the combustion chamber. This advanced design prevents gasket failure in high-boost, high-compression, or extreme temperature applications, making it the preferred choice for racers and serious enthusiasts building reliable, high-performance LSX engines.