Power Play - 2007 Hummer H3
At a glance, the 3.7L engine doesn't look much different than its 3.5L predecessor. The difference, though, is in the increase of 22 hp and 17 lb-ft of torque. Hummer engineers accomplished this via larger cylinder bores, larger valves, new camshaft profiles, and a higher-airflow cylinder head. View Related Article
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