2006 ford f650 rollback, had bought truck with bad C7. pulled a C7 out of a frightliner school bus, swapped everything over, drove the truck 20 miles or so. pulled out of my driveway and heard a bang. (thought it was a loose clamp or something). on left side of engine bolted to the intake heater housing is a bracket for the air box. the holw was behind the bracket, pulled it all off can not from the 1/2 inch peice. tpook a shop vac and went in as far asw i could. put it all back together and truck has a mis, would anyone know how this happened, thanks for your input!