SBM Head Gasket - 64-89 18 Bolt Heads

The FEL-PRO SBM Head Gasket for 64-89 18 Bolt Heads (MPN 1100) is a purpose-built cylinder head gasket engineered for Small Block Mopar platforms. This gasket features a steel core laminate construction with a 4.180-inch bore and 0.039-inch compression thickness, designed to seal combustion chambers under sustained pressure and temperature cycling. FEL-PRO's laminate design provides superior gasket crush and recovery characteristics compared to conventional single-layer gaskets, critical for maintaining a consistent seal across multiple heat cycles in both street and performance applications.

The steel core laminate construction offers reliable sealing on SBM cylinder heads across 1964–1989 model years with 18-bolt configurations. The 0.039-inch compression thickness is calibrated for standard Small Block Mopar deck heights and head surface finishes, ensuring proper gasket load and preload retention. This thickness specification directly impacts combustion chamber volume and compression ratio, making proper fitment essential for maintaining intended engine performance and avoiding detonation or lean-running conditions that can damage pistons or valves.

This gasket is intended for engine builders, restoration specialists, and SBM Mopar platform owners performing head gasket replacement, engine assembly, or cylinder head work. Whether addressing a failure on an original 318, 340, or 360 engine or rebuilding a stroker platform, the FEL-PRO 1100 provides dependable sealing for both stock and moderate performance builds. Correct bolt torque sequence and specification are essential—refer to the engine manufacturer's technical documentation or a qualified rebuilder to ensure proper installation and gasket crush.