I find that very interesting. I don't remember ever seeing an H Model Cummins. There were still some JT180 engines around when I started. I think it may have been the H block with a supercharger. I first Diesel as a 62 Internationals with a NH220 with a displacement of 743. I soon repowered with an NHC250 which was 855 cu in. 855 cu in was the flagship of the Cummins engines until they could no longer pass emissions after 2003. The H series was 672 cu in. I still run 672 cu in engines in my bulk rigs to save weight. 2003 ISM's set at 370HP and 1450 ft.lbs torque. 2003 was the last year the ISM was offered without EGR.

With all the millions of miles I have logged with Cummins engines over the past half century, I experienced my first 2 failures over the past year. I lost an N14 when a turbo exploded and the driver panicked and didn't put it into gear go kill it. It ran away like a Detroit until it spun a bearing. And I lost an ISM a couple of weeks ago. I bought a used truck from a dealer in Georgia. The speedo and the ECM matched the engine. First load, a rod went out the side of the block. We then discovered the ID tag had been super glued to the block instead of the factory rivets. This one may get interesting because I have a motorized statement from the dealer that it was his personal truck and the mileage was correct.