Heat treated steel pump hub; Edelbrock products offer improved performance and aesthetics for a broad array of vehicles and engines. 'Proven performance' is the philosophy by which Edelbrock was founded and it continues to this day with the highest standards for performance and quality. Edelbrock core products are engineered manufactured and tested in the USA to ensure the best quality possible. This is further backed by some of the best warranties in the industry and a highly qualified technical support staff.; Heat treated sprag races for increased strength and durability for off-road abuse; Double captured roller thrust beatings for increased capacity and reduced drag critical for off-road use; Turbine spline reinforcement welds for increased durability.