Speedmaster PCE348.1007 MLS Multi-Layer Steel Head Gasket 4.065" Bore 0.040" Compressed Thickness

The Speedmaster PCE348.1007 is a Multi-Layer Steel (MLS) cylinder head gasket engineered for Ford small block 289, 302, and 351 Windsor engines. With a 4.065" bore and a 0.040" compressed thickness, this gasket is built to maintain a reliable, leak-free seal under the extreme demands of high-performance and forced-induction engine builds.

Key Features:

• Multi-Layer Steel (MLS) construction — high-pressure steel laminate design resists the extreme shearing forces generated between aluminum cylinder heads and cast-iron engine blocks
• Internal embossments — expand under heat and combustion pressure to create a superior seal in high-stress applications, including nitrous oxide and turbocharged setups
• Versatile compatibility — suitable for aluminum-to-cast-iron and aluminum-to-aluminum head and block combinations
• Superior torque retention — outperforms conventional and composite head gaskets in high-horsepower, high cylinder-pressure applications
• Reduced distortion — MLS design minimizes gasket deformation during thermal cycling compared to traditional composite gaskets
• Bore: 4.065 inches
• Compressed Thickness: 0.040 inches
• Lock Wire: No
• Sold individually (one gasket per purchase)

Speedmaster's MLS head gaskets are the preferred choice for engine builders pushing serious power levels. Whether you're building a street/strip small block Ford or a dedicated race engine, the PCE348.1007 delivers the sealing integrity needed to handle elevated combustion pressures and temperatures with confidence.