SBF MLS Head Gasket 4.100 Bore .052

The FEL-PRO SBF MLS Head Gasket 4.100 Bore .052 is a multi-layer steel cylinder head gasket engineered for Small Block Ford engines. This FEL-PRO head gasket (part number 1133 SD-5) delivers reliable sealing performance across a range of engine builds, from stock restorations to modified performance applications. The 4.100-inch bore specification and 0.052-inch compression thickness are precisely matched to Small Block Ford architecture, ensuring proper cylinder head-to-block interface and combustion chamber sealing.

Multi-layer steel gasket construction provides superior durability and heat resistance compared to traditional single-layer designs. The 0.052-inch compression thickness is a critical specification that affects final engine compression ratio and must be matched to your specific engine build requirements. This gasket maintains its seal integrity under sustained heat cycles and mechanical stress, essential for both street and track applications. The precise bore diameter ensures consistent clamping load distribution across all cylinders, preventing hot spots and localized gasket failure that can compromise engine reliability.

This Small Block Ford head gasket is designed for engine builders and rebuilders performing top-end work on 221-, 260-, 289-, 302-, and 351W-cubic-inch variants. Whether restoring a classic muscle car, maintaining a towing engine, or supporting a performance rebuild, this FEL-PRO gasket delivers the sealing consistency these applications demand. Proper gasket selection and installation are critical to preventing coolant leaks, oil seepage, and compression loss. FEL-PRO's established reputation in OEM and aftermarket gasket manufacturing makes this a specification-grade choice for serious Small Block Ford work.