The Vortec 5300, or LM7/L59/LM4/L33, is a V8 truck engine. It is a stroked (by 9 mm) version of the Vortec 4800 and replaced the 5700 L31. L59 denoted a flexible fuel version of the standard fuel LM7 engine.  Power output is 270-305 hp (213-220 kW) and torque is 315 lb·ft (427 N·m) to 335 lb·ft (454 N·m). Displacement is 5.3 L (5,328 cc (325.1 cu in)) from 96.01 mm 3.78 inch bore and 92.00 mm stroke 3.622 inch stroke .

This kit includes a re programmed  factory ECU with all vehicle anti theft removed, & Harness for use with mechanical cable drive or drive by wire throttle bodies, depending on application.  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 not included in all  kits. Some drive by wire applications may require a tach module, call for more info.  There is no ECU core required.  Please call or Contact us for VVT applications. Depending on engine trans combo some of these packages can run GM automatic transmissions as well.  Please call or Contact us