General Motors 650 horsepower 6.2-liter LT4 V8 used in the 2015 Corvette Z06 is built at its Tonawanda Engine Plant in, you guessed it, Tonawanda, New York. The facility is also responsible for assembling its EcoTec3 4.3-liter V6, EcoTec3 5.3- and 6.2-liter V8s, Ecotec 2.0- and 2.5-liter four-cylinders and the 6.2-liter LT1 V8. Speed Academy recently took a trip to the plant, and of all the engine build processes they could have documented, they unsurprisingly chose the LT4.
The beginning of the LT4 build process starts when the machined block is treated by a special CNC machine. Then the pistons, rods, crankshaft and other key components are installed by hand, followed by the valvetrain, and of course, the 1.7-liter supercharger.
Speed Academy’s short documentary below explains the whole LT4 build process better than we ever could, so check it out below if you have 11 minutes to spare.