90-9509 Top end gasket set. 3-5/8" big bore

Building a high-performance Sportster often involves moving to a larger bore, and this S&S top end gasket set is designed for exactly that. It is tailored for 1986 to 2022 XL Sportsters equipped with a 3-5/8 inch big bore S&S engine. Sold as a set, this kit provides the specialized gaskets needed to seal the top end of these modified Evo Sportster powerplants. Note that this set does not include the rocker cover gaskets, which will need to be purchased separately. Because it is designed specifically for S&S engine components, you can trust the fitment and sealing quality to handle the increased compression and heat of a big bore Sportster build.