<P> The TrailBlazer comes with a 273 hp (204 kW) 277 lb ⋅ ft (376 N ⋅ m) all - aluminum 4.2 L "Atlas" LL8 inline - six engine standard and an optional 302 hp (225 kW) 330 lb ⋅ ft (447 N ⋅ m) aluminum small - block 5.3 L V8 with Active Fuel Management . The inline - six makes the TrailBlazer the most powerful six - cylinder SUV in its class . The Active Fuel Management system on the V8 engine shuts off 4 of the 8 cylinders during highway travel and idle to save fuel . The 6 - cylinder versions of the TrailBlazer get up to 20 miles per US gallon (12 L / 100 km; 24 mpg) highway, according to refreshed United States Environmental Protection Agency estimates . </P> <P> The TrailBlazer won the North American Truck of the Year award in 2002 . The 4.2 L I6 Atlas LL8 appeared on the Ward's 10 Best Engines list from 2002--2005 with innovative features such as DOHC, Variable Valve Timing (VVT) on the exhaust camshaft, and GM's patented Lost - foam casting process . </P> <Ul> <Li> 2002--2009 LL8 4.2 L I6 </Li> <Li> 2003--2004 LM4 5.3 L V8 </Li> <Li> 2005--2009 LH6 5.3 L V8 </Li> <Li> 2006--2009 LS2 6.0 L V8 </Li> </Ul> <Li> 2002--2009 LL8 4.2 L I6 </Li>

What engine is in a 2003 chevy trailblazer