C9149 EST motor gasket kit. 3-7/8" Big Bore

This Cometic EST (Extreme Sealing Technology) motor gasket kit is the ultimate solution for a complete engine overhaul on 2006 to 2017 103-inch Dyna models with a 3-7/8 inch big bore. This comprehensive set includes every gasket, seal, and O-ring needed for the job, including primary gaskets. The kit features 0.040-inch thick Multi-Layer Steel (MLS) head gaskets that eliminate the need for dowel pin O-rings, and 0.020-inch Single-Layer Steel (SLS) base and rocker gaskets coated in Viton rubber. These high-tech gaskets won't weep or tear, ensuring a perfect seal for your high-performance Big Twin build. This kit is sold as a set.