There were a few 1 ton chevy's built with the 3116 engine. This was a little heavy and the torque broke the frames on those pickups therefore they were never put in to production. The 3116 evolved into the 3126. The 3126 evolved into the C-7 ACERT. This is a very good small cat engine used in a lot of medium duty trucks. (Top Kicks, Kodiaks, and the like) Hope this helps.
I am employed by a local municipality in the Bay Area and I haul a Toro Gang gangmower with a Cat engined Topkick. Great engine. Hauls that big gangmower like nothing. Cat engines rule!!