27/9/2012 · Understanding and Profiting From the Caterpillar C7. Advertisement. By. Bob McDonald. on. Sep 27, 2012. From 2003 to 2009, the C7 was Caterpillar’s primary engine for medium-duty trucks with a GVWR of 18,000 to 33,000 lbs. from GMC, Ford, Freightliner and Paccar. The Cat C7 is an inline 6-cylinder diesel engine with a displacement of 7.2
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