Chevrolet TrailBlazer Vortec
The 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 4.2 L (4160 cc, 254 cu in), with a 93 mm (3.7 in) bore and 102 mm (4.0 in) stroke. When introduced, this engine's power was 270 hp (205 kW) at 6000 rpm and torque was 275 lb·ft (373 N·m) at 3600 rpm. 2003 saw a slight bump in power to 275 hp (205 kW), while torque was unchanged. For 2006, power was increased to 291 hp (217 kW) at 6000 rpm and torque to 277 lb·ft (376 N·m) at 4800 rpm with the addition of a MAF and a complete internal redesign of the engine. The Atlas LL8 was on the Ward's 10 Best Engines list for 2002 through 2005. Engine redline is 6300 rpm.
Source: Wikipedia, 2013