I used to work for a company that built street sweepers. we used the 6.5NA(no arse)in the twin engine sweepers(aux engine for the hydraulics). They got a bunch of them from GM at a special deal. They would test drive teh sweepers from one town to antother about 40 miles away. Half of them didn't make it back(spit the cranks thru the pan). We had all kinds of probelms with them. Used the 7.3 mostly, very few problems with them. Used the 5.9, but it didn't match the torque below 1000 rpm that the 7.3 had(ran below 1000 while sweeping). It wasn't untill cummins came out with the 4 valve head that it would work as hard as the 7.3. But thats been a while back, just trying to up to date on them
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