4.200 MLS Head Gasket .060 - SBC

The 4.200 MLS Head Gasket .060 - SBC by Cometic Gaskets is engineered for serious Small Block Chevy builds where reliability and sealing integrity are non-negotiable. This multi-layer steel (MLS) gasket serves as the critical barrier between your cylinder head and engine block, preventing combustion gases and coolant from escaping into areas they shouldn't. Whether you're rebuilding a stock 350, tuning a street performer, or assembling a competition engine, this gasket delivers consistent clamping force retention and exceptional sealing performance across a wide temperature and pressure range.

Cometic's MLS design employs multiple steel layers bonded together, offering superior dimensional stability compared to traditional composite or cork gaskets—particularly important when running higher boost pressures or extended rpm ranges. The .060-inch thickness is the most common specification for SBC applications and ensures proper head-to-block spacing without requiring custom machine work on most stock or mildly modified engines. The 4.200-inch bore diameter accommodates both standard and overbore blocks, providing compatibility across a broad spectrum of Small Block Chevy generations. MLS gaskets demand proper surface preparation and correct fastener torque sequences to perform optimally; any high spots or contamination on the sealing surfaces will compromise the seal.

Technicians and engine builders rely on Cometic head gaskets for naturally aspirated street engines, turbocharged applications, and even mild supercharger setups where factory gaskets fall short. This gasket is ideal for anyone performing a complete engine overhaul, replacing a failed stock gasket, or upgrading to a more robust sealing solution during a cylinder head refresh. Before installation, verify your block and head are properly decked and surfaced to manufacturer specifications, and always torque fasteners in the correct sequence using a calibrated wrench—improper installation is the leading cause of premature gasket failure regardless of quality.