S&S Cycle SS910-0481 98ci Big Bore Kit Black for Harley-Davidson Twin Cam 99-06This bolt in big bore kit is easy to install, and requires no machining or rebalancing. Stock engine height is maintained so there are no manifold or frame fitment issues. The S&S 11 fin cylinder design closely resembles OEM shape and come prefinished ready to install. Cylinders feature increased fin area for better heat dissipation, and the centrifugal cast, gray iron liner features 40,000 psi tensile strength for superior wear and performance. The