LST Low Shock Technology cam lobe profiles for increased horsepower and improved stability at higher rpm; 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.; LST camshafts excel in the 6 700 to 7 300 RPM range allowing engines not only to turn more RPM but also to make more power in this range.