Speedmaster PCE348.1025 Chevy GM LS MLS Head Gasket 4.200" Bore 0.040" Thick Left

The Speedmaster PCE348.1025 is a high-performance Multi-Layer Steel (MLS) head gasket engineered specifically for Chevy GM LS engines. Designed for the left bank cylinder head, this gasket features a 4.200-inch bore diameter and 0.040-inch compressed thickness, making it ideal for both stock rebuilds and high-performance applications.

Key Features:

• Multi-layer steel construction for superior sealing and durability
• 4.200-inch bore diameter accommodates stock and slightly overbored LS engines
• 0.040-inch compressed thickness for precise compression ratio tuning
• Internal embossments that expand under heat to enhance sealing at high temperatures
• Excellent torque retention and resistance to gasket distortion
• Handles extreme cylinder pressures from forced induction and nitrous applications
• Compatible with aluminum head to cast iron block or aluminum block combinations

MLS gaskets utilize a high-pressure steel laminate design that withstands the extreme shearing forces that occur between dissimilar materials like aluminum heads and iron blocks. The multi-layer construction maintains consistent contact pressure between the cylinder head and block throughout the engine's operating cycle, even under the punishing conditions of turbocharged, supercharged, or nitrous-enhanced engines. This gasket offers superior performance compared to conventional composite gaskets in high-horsepower applications where combustion pressures and temperatures exceed factory specifications.

Note: This is a left-side gasket only. Right-side gasket must be purchased separately for complete engine assembly.