i may be wrong, but last time I had one of those(7.3) down( long time ago) I believe they were dry sleeve engines. We used to use them in street sweepers, used to use the old Detroit 8.2 till they stoped making them, we used teh 5.9 Cummins till we upped the hydraulic demands, we couldn't get the Cummins to make the torque we needed at 1000 rpm(had to be emmsion legal), so we stepped up to the 7.3 high torque 195 hp, worked great in those sweepers, about the time I left, they had just started to use the 24 valve 5.9, they seemed to work pretty good. Funny thing, they bought a whole bunch of GM 6.5 NAs with no warranty from GM, we used them in the twin engine trucks(Had to use an aux engine to spin the hydraulics), they would drive them to Rocky Mount from Wake Forest, NC to break them in, half of the engines didn't make it there, they would blow the crank right out the bottom
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