Edelbrock Pro-Flo XT EFI Intake Manifold For Chevrolet 302-400 Small-Block V8Edelbrock part #7137 Pro Flo XT intake manifold is designed for 1957 86 S B Chevy. This manifold is engineered with a large plenum and long tapered runners to deliver maximum horsepower and broad torque band throughout the rpm range (1500 7000 rpm). This Pro Flo XT EFI intake accepts Edelbrock Pro Flo XT Throttle Bodies and Fuel Rails (Sold Separately).