C5171 Timing Cover Gasket/Seal Set, Molded Rubber Material Individual gaskets and gasket kits are available for both domestic and import automotive markets. The performance gasket line gives you options in head gasket hole size and shape, gasket thickness and custom water passages and pocket dimension solutions. MLS valve cover and exhaust gaskets are also part of the performance gasket line. The StreetPro gasket line is a Cometic Gasket product line manufactured by Cometic. StreetPro is geared toward the street rider looking to purchase a kit with all the gaskets and seals necessary for a rebuild. StreetPro gasket kits are sold as top end kits and bottom end kits. Buy top and bottom end kits for a total engine rebuild. Quality gasket materials are a priority in StreetPro kits. Kit materials include MLS, AFM, Aramid fiber and Clad armor. Modern light engines are producing more horsepower, higher cylinder pressure, clamp loading, and extreme temperatures. Cometic is committed to providing quality, innovative gaskets while maximizing the power and performance of your engines. Cometic Gaskets are proudly made in the USA with materials made on American soil. Cometic Gasket, Inc., is an exclusive product of NASCAR Performance.