The base engine for all TrailBlazers is the 291-horsepower Vortec 4200, a 4.2-liter inline-6. The Vortec 5300 5.3-liter overhead-valve V8, rated 300 horsepower and 330 pound-feet of torque, is now available as an option on both the standard and EXT models. All come standard with a four-speed automatic transmission. The TrailBlazer SS comes with GM's LS2 6.0-liter V8 engine, which produces 395 horsepower and 400 pound-feet of torque. For added safety, GM's StabiliTrack electronic stability control system is now standard. Other safety features include dual-stage driver and passenger airbags.The Chevrolet TrailBlazer is a carryover from 2006.