C9738 Cylinder base gasket set. SLS 4" bore

Achieving a perfect seal on your big bore Twin Cam requires high-quality components like this Cometic cylinder base gasket set. Designed for engines with a 4-inch bore, such as the 110-inch factory motors and custom big bore builds, these gaskets provide a reliable barrier against leaks. They are constructed from Single Layer Steel with a .020-inch thickness, featuring a non-embossed steel core and a .001-inch nitrile rubber coating on both sides for superior heat resistance. This set provides the front and rear gaskets for one engine and is sold as a pair. Fitment includes 1999 to 2017 Twin Cam models, excluding the 2014 to 2016 Twin Cooled variants.