These modified MLS head gaskets are designed to improve cooling efficiency in Gen III and Gen IV LS engines by increasing coolant flow around the cylinders. Seven water jacket holes have been opened to enhance water circulation, helping reduce hot spots and stabilize operating temperatures under high-load conditions.

Does improving cooling and head gasket design increase horsepower and RPM?
Yes—testing by Robert Yates Racing Engines (RYRE) has shown that improved coolant flow and lower localized temperatures increase engine efficiency and power output. OEM LS cooling systems operate at elevated temperatures for emissions and fuel economy, which can limit performance in racing environments. By improving coolant circulation and reducing discharge temperatures, these gaskets help unlock additional power and RPM stability under sustained load.

This small bore gasket is designed for 4.8L, 5.3L, and 5.7L engines with bore sizes up to 3.900" and features a 0.050" compressed thickness. The coated multi-layer steel (MLS) construction delivers excellent sealing strength and durability for off-road and racing applications.

• Sold individually (price is for one head gasket; not sold as a pair)

• For off-road use only