Our Street Stainless Valves are a quality stainless ONE piece forged valve at a price level perfect for the everyday rebuild. Made of an excellent quality stainless steel on the intake and premium 21-4N material on the exhaust. They feature a large seat margin which allows many regrinds and come with smooth machines heads, as well as hard chromed stems to reduce wear. All Street Stainless Valves use single keeper grooves to give greater valve tip strength.