045 MLS 4.63in Bore Head .045 - BBC Brodix

The Cometic Gaskets 045 MLS 4.63in Bore Head gasket for BBC Brodix cylinder heads is engineered for serious big-block Chevrolet builds where reliability and compression integrity matter. This multi-layer steel (MLS) head gasket is the preferred choice for street, strip, and competition engines that demand consistent sealing performance across repeated heat cycles. Whether you're rebuilding a classic muscle car, upgrading a crate motor package, or freshening a high-mileage block, this gasket delivers the durability required for modern fuel systems and boost applications.

The 045-inch compressed thickness specification ensures proper deck height accommodation on Brodix aluminum cylinder heads, which are precision-machined to exacting tolerances. MLS construction provides superior re-sealability, allowing the gasket to conform to surface irregularities while maintaining a stable seal under combustion pressure spikes and thermal stress. The 4.63-inch bore diameter is sized for large-displacement big-block Chevrolet applications, accommodating oversized pistons and maximizing chamber volume for optimal flow characteristics.

Unlike conventional graphite gaskets, this MLS design resists gasket creep and maintains clamp load retention even after extended engine operation, critical for engines running ethanol blends or nitrous oxide systems. Installers and engine builders working with Brodix BBC heads—whether naturally aspirated or turbocharged—will appreciate the precise engineering that eliminates the risk of failure under extreme conditions.