4.165 MLS Head Gasket .066- SBC

The Cometic Gaskets CAGC5248-066 is a 4.165-inch bore MLS head gasket with a 0.066-inch compressed thickness, purpose-built for small block Chevy engines. It is designed for engine builders pursuing increased compression ratios and higher cylinder pressures in performance and racing applications. The thicker profile of this gasket allows for precise chamber volume adjustment when optimizing an SBC build for specific power targets.

Multi-layer steel construction gives this gasket a significant advantage over conventional composition designs. The alternating layers of stainless steel and elastomer coating create a seal that conforms to minor surface imperfections while resisting the combustion pressures and thermal loads produced by high-horsepower engines. The 0.066-inch thickness is specifically chosen for builds that benefit from a slight reduction in compression ratio or increased piston-to-valve clearance.

Whether you are assembling a bracket racing engine, a circle track powerplant, or a high-performance street small block, this gasket delivers the sealing reliability required for demanding service. It is compatible with a broad range of SBC bore sizes and head configurations, giving engine builders flexibility across multiple platform variants. Installing this Cometic MLS gasket is a proven step toward achieving consistent, trouble-free engine performance at elevated power levels.