LSX Engine Build - To The Extreme

Before the crank can be installed, the clearances need to be checked with the Clevite main bearings. This yields a verified .0022-.0024- inches of clearance with the Callies 2.559-inch journals (and later 004-inch of endplay) thanks to the precisely honed 2.751-inch main bore. arP main studs and assembly lube are the obvious choice for a race motor.

Factory gM cam bearings, believe it or not, are sufficient for this high-horsepower, solid roller motor; however, they do not come installed.

The crank is laid on top of the bearings and the mains are torqued down with 60 ft-lb on the inner studs, 50 on the outer, and 22 on the sides.

A custom solid roller cam from Futral Motorsports, measuring over .700-inch lift and 255 of duration, is inserted into the block with a light coating of motor oil. This custom grind from Cam Motion uses a 116LSa to keep boost from escaping the cylinder prior to combustion.

The LSX cam retention plate is bolted up, then the factory gM timing set.