SuperMatic Torque Converters. Connects late LS V8 Transmission to Early Gen 1 small block/big block Chevy. SuperMatic Torque Converters from Chevrolet Performance are designed to provide long life when matched with a SuperMatic Transmission. Each converter incorporates the following features: Steel billet front cover, custom stator, fully furnace brazed pump and turbine, heavy duty lock-up clutch, all internal components static balanced, and fully vector balanced as an assembly. Designed for Chevrolet performance crate engines and transmissions. Fits 350/290 horsepower deluxe, 350 HO turn-key with iron vortec heads, ZZ4 turn-key with aluminum heads, Ram Jet 350 - PFI with iron vortec heads, HT383 base performance engine, 454 HO with iron heads and roller Cam, ZZ454/440 - 440 horsepower with aluminum heads, HT502 truck replacement engine, 502 HO with iron heads and roller cam.