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I used the whole Big Cam 3 from the 915a1. My nhc250 was starting to have blowby after 250,000mi on it. I had already put the CAT 16 speed behind the small cam. Big cams are generally SAE1 bellhousings. The 939s use SAE2. The CAT transmission was SAE1 which involves raising the cab and hood...

Everything on an A2 sits about 10inches further forward than an nhc250 truck. @profo has done a 927 build and he added 4ft of frame to the backend from another truck. https://www.steelsoldiers.com/threads/my-camper-project.128210/ You just need that full length truck measurement minus what...

Well you don't know much about engines then because a small cam NHC250 can be drilled and recon'd into a 400 Magnum is what cummins did with old small cam cores when the big cam was introduced so they weren't just scrap I've done the big cam swap less than 4k that included a whole parts truck...

The NHC250 can be repowered easier with a big cam swap that are a dime a dozen over the A2 trucks that can't be without lots more mods. A2s are just as gutless on a heavy platform as an nhc250 even intercooled and with max fuel from the mw pump. Took one outwest a few years ago and it was a long...