Speedmaster PCE348.1017 LS MLS Head Gasket Bore Thick - 4.050 0.040

The Speedmaster PCE348.1017 is a high-performance multi-layer steel (MLS) head gasket engineered for GM LS engines with a 4.050-inch bore diameter and 0.040-inch compressed thickness. Designed to handle extreme horsepower and cylinder pressure, this gasket is ideal for heavily modified engines running forced induction, nitrous oxide, or naturally aspirated high-compression builds.

Key Features:

• Multi-layer steel construction with high-pressure steel laminate design for superior strength
• 4.050-inch bore diameter accommodates overbored LS engines
• 0.040-inch compressed thickness for precise compression ratio tuning
• Internal embossments expand under heat to enhance sealing during high combustion pressures and temperatures
• Maintains consistent contact pressure between cylinder head and block during engine operation
• Resists extreme shearing forces common between aluminum heads and iron blocks
• Compatible with aluminum-to-iron and aluminum-to-aluminum configurations
• Superior torque retention with minimal distortion compared to composite gaskets

MLS head gaskets are the preferred choice for high-horsepower applications because they handle the thermal expansion and movement between dissimilar metals better than conventional gaskets. The multi-layer design creates a resilient seal that withstands the punishment of turbocharged, supercharged, and nitrous-fed engines. Sold individually.