4.500 MLS Head Gasket .051 - BBM

The 4.500 MLS Head Gasket .051 - BBM from Cometic Gaskets is a precision-engineered cylinder head gasket specifically designed for classic Mopar B and RB-series big-block engines. This multi-layer steel gasket serves as the critical seal between the engine block and cylinder head, preventing coolant and combustion gas leakage while maintaining compression integrity. Whether you're rebuilding a vintage muscle car or restoring a performance engine, this gasket delivers the reliability needed for long-term engine durability and leak-free operation.

Constructed from multi-layer steel (MLS), the 4.500 MLS Head Gasket .051 features a 4.500-inch bore diameter and a 0.051-inch thickness optimized for OEM and performance applications on Mopar B and RB-series engines. The MLS design utilizes precise laminated steel layers that conform to both head and block surfaces under clamping load, creating a superior seal that resists thermal cycling and combustion pressure spikes. This gasket is essential for anyone performing a complete engine rebuild on Mopar B or RB-series platforms.

Compatible with various engine sizes, including 318, 340, 360, 383, 400, 413, 426, and 440 cubic-inch variants, this gasket ensures proper sealing and performance. Installation requires proper surface preparation of both the cylinder head and block deck, along with correct head bolt torque sequences. The 4.500 MLS Head Gasket .051 is designed to maintain proper head bolt preload characteristics on the original engine platform, making it a reliable choice for engine builders.