The Chevy 4.2l engine, LL8 (or Vortec 4200), is a straight-6 truck engine. It was the first Atlas engine, and was designed for GM's new SUV line. It displaces 4.2L, with a 93mm (3.7 in) bore and 102mm (4.0 in) stroke. When introduced, this Chevy 4.2l engine's power was 270... read more