Vortec 4.2L I-6 Engine
Standard in TrailBlazer LT models, the Vortec 4.2L I-6 engine generates 285 hp — unsurpassed in its class(1) — at 6000 rpm and 276 lb.-ft. of torque at 4600 rpm.
Some important features of the Vortec 4.2L I-6 engine:
- A broad torque curve through the majority of the speed range helps this engine deliver 90 percent of peak torque from 2000 to 6000 rpm. This provides ample torque at low rpm and high rpm, giving you an SUV that responds with the torque you need, when you need it.
- Electronic Throttle Control (ETC) relays accelerator pedal position information to the Powertrain Control Module (PCM). The PCM then positions the throttle air valve in the best position to help achieve optimum vehicle drivability.
- Pistons and rods are lightweight, helping this engine run comfortably at high rpm and producing more power from smaller displacements.
- Variable Valve Timing offers a number of advantages over conventional valve timing in the areas of power, efficiency and emissions and helps produce near-peak levels of torque over an extended range.
- An advanced heat treatment process give the aluminum engine block and cylinder heads light weight with exceptional strength.
- Nodular iron crankshafts were optimized using the most advanced math-based computer tools available to GM to help provide quiet operation, long-term reliability and remarkable durability.
- Iridium-tip spark plugs help this engine travel up to 100,000 miles before the plugs need to be replaced. The recommended engine coolant change interval is up to 5 years or 150,000 miles, whichever comes first. And the accessory drive belt is designed to operate up to 150,000 miles before requiring replacement. Maintenance needs vary with different uses and driving conditions. See the Owner’s Manual for more information. See your dealer for the Chevy TrailBlazer maintenance schedule.
1 Based on 2007 GM Midsize Utility traditional segment and latest available competitive information. Excludes other GM vehicles.