Designed For 600/660 Series Carbs; 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.; Fuel Block Has .3750 in. NPT Female Inlet/Outlet; Includes A Balanced Flow Fuel Block; Includes Four Full Flow Hose Ends; Includes Two 18 in. Lengths Of -6 ProFlex Hose; Includes Two Big Bore Carb Fittings