This powerful new manifold is designed for the popular Chevrolet LS1 (5.7L) small-block V8 originally used in 1997 and later Corvettes and 1998-02 Camaros and Firebirds. It also fits the Corvette LS6 engine and any other Gen III engine including the LM7 (5.3L), LR4 (4.8L), and LQ4 (6.0L). It allows the use of a carburettor on these originally computer-controlled engines, offering maximum power and a broad torque curve from 1500 to 6500 rpm. This manifold made 410 hp and 418 ft/lbs. of torque in dyno tests with our matching cam # ED2215 and Performer Series carb # ED1413. The Performer RPM LS1 is designed to work with an electronic Timing Control Module made by MSD (not included) which works with OE sensors to fire the coil-on-plug ignition system and offers a choice of six timing curves. Made in USA.