99000-2 Severe Duty stainless valves, exhaust. STD

For 1957 to 1985 Sportster owners looking for maximum reliability, these Manley Severe Duty exhaust valves are the industry standard. Sold as a pair, these standard-sized valves feature a 1.563-inch head diameter and a .3385-inch stem. They are manufactured from a high-temperature stainless alloy and feature swirl-polished heads for improved flow and chrome-plated stems for longevity. These valves are up to 30% lighter than stock components, which helps maintain a stable valvetrain even at high RPMs. They are an excellent replacement for OEM 18036-80, offering the kind of durability required for both street performance and demanding racing applications.