Improvements developed through FEA analysis for an even stronger; 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.; stiffer body without compromising mass. A new arced channel and contoured top; similar to a bridge design; give the rockers the best strength-to-weight ratio possible.