[tommr]

Yes. the BB Chevy engines fit fine. Not all that different than in size to the V6. The 8.0L has made its way into new production school buses and those bus builders have designed a accessory drive system that incorporates an air brake compressor. It makes the BB Chevy an attractive option and crate engine prices are good. That said a Duramax eliminates 85 gallons of gasoline from the bus. 06.5-07 LBZ is the preferred Duramax swap engine. Aftermarket wiring is available new and reliability and parts availability is excellent. The 2012 and later LML/LMM Duramax has very little swap support from the aftermarket. You cant run them without the emissions. An entire body harness is required to accomplish that swap. Not likely a harness and a computer is ever available. But who knows?