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It would be the easiest way to retain the dual gen setup if you swap the IP, coolant crossover and front accessories and brackets. You'll need to swap waterpumps as well, v-belt rotates ccw, serpentine rotates cw....or maybe its the other way, can never remember. Sent from my SM-S920L using...

Oh, I also think GEP also cast a 506, and some of theirs don't have date stamps, they are in the same category as a navistar, superior to a GM cast. Sent from my SM-S920L using Tapatalk

There's a lot of debate on actual hp and tq ratings, because they list it at a certain rpm. The military is a J-code (no emissions) an '84 civilian j-code was rated at 155hp back in the day, so figure the cucv was rated close to the same. A c-code (emissions) was rated between 120 and 135 hp...

Your right, I forgot navistar kept the 506 casting number, anything after a 2001 date code should be navistar and good. Sent from my SM-S920L using Tapatalk

Oh, I also see it has an electronic injection pump, so you would need another injection pump, a 6.2 pump will work, but at that point it's just a glorified 6.2 and the dual thermostat housing and most likely the whole accesory/serpentine system would need to be replace with the 6.2 v-belt...

97 is the really bad year, unfortunately the only way to tell if it's good is to take the oil pan off and check. I do have a 506, 1997 6.5 turbo diesel in my '85 GMC 1/2 ton, that had a crack free bottom end with 126,xxx miles on it. The thing with the 506 blocks is they added piston squirters...

The 506 blocks aren't very good, they did use a smaller outer bolt (10mm vs. 12mm) for the mains, but they cracked worse then any previous block. Sent from my SM-S920L using Tapatalk