Speedmaster PCE348.1005 MLS Multi-Layer Steel Head Gasket Ford 302 351C Cleveland 4.065" Bore 0.040" Thickness

The Speedmaster PCE348.1005 is a Multi-Layer Steel (MLS) head gasket engineered for Ford 302 and 351C Cleveland engines. With a 4.065" bore diameter and 0.040" compressed thickness, this gasket delivers a precision fit and robust seal for both stock rebuilds and high-performance applications.

Key Features:

• Multi-Layer Steel (MLS) construction — high-pressure steel laminate design that resists the extreme shearing forces common between aluminum cylinder heads and iron engine blocks
• Internal embossments that expand under heat, creating a tighter, more reliable seal as combustion pressures and temperatures rise
• Superior torque retention — maintains consistent clamping load over time compared to traditional composite gaskets
• Reduced head and block distortion under high-load conditions
• Compatible with aluminum-to-cast iron and aluminum-to-aluminum cylinder head and block combinations
• Bore diameter: 4.065"
• Compressed thickness: 0.040"
• Ideal for forced induction, heavy nitrous, and high cylinder-pressure builds

MLS head gaskets are the preferred choice in serious performance and racing applications where conventional composite gaskets fall short. The Speedmaster PCE348.1005 is built to maintain a consistent, leak-free seal even under the extreme combustion pressures and thermal cycling demands of turbocharged and nitrous-assisted Ford Cleveland engines.