H3 Conversions


Vortec 6.2 Liter LS3 Engine and 4L60HD Transmission Conversions for the Hummer H3

Mash Motors Inc. is the first company to successfully convert the Hummer H3 with the Vortec 6.2 Liter LS3 engine and 4L60HD transmission by GM.

2006-2010 Hummer H3 Conversions

Starting at $24,500

  • Vortec 6000 6.2 Liter LS3 V8 engine
  • 4L60HD 4-speed automatic transmission
  • Your choice of either full-time 4-wheel drive or selectable 2-wheel / 4-wheel drive heavy-duty transfer case
  • Custom engine harness and ECM
  • Custom exhaust
  • Custom cold air intake
  • Oversized fan and fan clutch
  • All necessary fluids, hoses and hardware
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Horsepower and MPG Expectations

The base conversion package starts out with 325 horsepower. With performance upgrades and modifications, the horsepower can can be increased to 495. The biggest gain from the conversion is the increased fuel mileage and towing capabilities that a stock H3 lacks.

Build Time

Each conversion is completed per the customer’s specific requests and therefore, build time is approximately 28 days for the H3. This ensures that each conversion is completed properly and the vehicle has been thoroughly inspected and road tested prior to delivery.