Speedmaster PCE348.1038 Ford Big Block FE 390 428 MLS Head Gasket 4.165" Bore

The Speedmaster PCE348.1038 is a premium multi-layer steel (MLS) head gasket engineered specifically for Ford Big Block FE engines, including 390 and 428 cubic inch variants. Featuring a 4.165-inch bore diameter and 0.040-inch compressed thickness, this gasket delivers exceptional sealing performance for high-performance and forced induction applications.

Key Features:

• Multi-layer steel construction with high-pressure laminate design for superior strength
• Internal embossments that expand under heat to enhance sealing at extreme combustion pressures
• Engineered to withstand high shearing forces between aluminum heads and iron blocks
• Ideal for turbocharged, supercharged, and heavy nitrous applications
• Compatible with aluminum-to-iron and aluminum-to-aluminum block configurations
• Superior torque retention and reduced distortion compared to composite gaskets
• Maintains consistent contact pressure throughout engine operation cycles

MLS head gaskets represent the gold standard for high-horsepower builds where cylinder pressures and temperatures exceed the capabilities of conventional gasket materials. The multi-layer design absorbs movement between the head and block while maintaining a positive seal, making this gasket an essential component for serious performance builds.