Cometic Gasket CG-C9780 Top End Gasket Kit w/0.040" Head Gaskets for 95ci Twin Cam 99-04 w/3.875" BoreDescription for Cometic Gaskets 1550 Big Bore Top End Kit EST (Extreme Sealing Technology) gasket kits contain MLS head gaskets, steel Viton coated base gaskets, blue Viton valve stem seals and AFM material Other features include the race style exhaust gasket, that won't fray into the port, and the rocker box base gasket which is made from a single layer of . 020" thick embossed Viton coated steel 1550 big bore top end kit EST kits are made for any