The LS3 was introduced as the Corvette's new base engine for the 2008 model year. It produces 430bhp (321Kw)@5900rpm and 424lb-ft (575Nm)@4600rpm without the optional Corvette exhaust and is SAE certified. The block is an updated version of the LS2 casting featuring a larger bore of 4.06 in (103.1 mm) creating a displacement of 6,162 cc (6.162 L; 376.0 cu in). It also features higher flowing cylinder heads sourced from the L92, a more aggressive camshaft with 0.551" lift, a 10.7:1 compression ratio, a revised valvetrain with 6 mm (0.24 in) offset intake rocker arms, a high-flow intake manifold and 47 lb/hr fuel injectors from the LS7 engine.

This kit includes a re programmed  factory ECU with all vehicle anti theft removed, & Harness drive by wire throttle body.  Includes  fuse block, electric fan controls, relays for electric fans & fuel pump.  Harness is 5 wire hook up to chassis (12v+,ignition, tach, fuel pump , electric fan +)  this system requires the use of 2 o2sensors and MAF sensor included this kit. Drive by wire pedal is also included.