4.600 MLS Head Gasket .051 - BBM

The Cometic Gaskets 4.600 MLS Head Gasket .051 (part C5799-051) is a multi-layer steel cylinder head gasket engineered for Mopar B and RB-series engines. This precision component seals the critical interface between the cylinder head and engine block, where combustion pressures and thermal cycling demand absolute reliability. The .051-inch compression thickness and 4.600-inch bore diameter are matched to specific engine configurations, making proper fitment essential for engine integrity and performance.

Multi-layer steel (MLS) gasket construction provides superior sealing compared to older composite designs, particularly under high combustion pressures and extreme temperature swings. The layered steel construction maintains compression and prevents micro-movement between surfaces, reducing the risk of coolant or oil seepage that compromises engine durability. The specified .051-inch thickness is calibrated for stock head geometry and compression ratios; using an incorrect thickness can alter combustion chamber volume and engine tuning characteristics. Precision manufacturing ensures consistent performance across the full bore diameter without hot spots or weak sealing zones.

This gasket is intended for rebuilds, restorations, and engine service on Mopar B-block and RB-block platforms—including 340, 360, 383, 400, 426, and 440 cubic inch variants. Technicians and engine builders rely on Cometic gaskets for critical OEM-level sealing when restoring original performance or maintaining vintage muscle cars. Proper installation requires clean surfaces, appropriate torque sequencing, and use of compatible head bolts; the gasket itself requires no sealant when used with standard fastening practices.