There's probably some industrial and marine versions too. I never did write those down for some reason. The marine ones I had were all complete rusted out junk, so they got scrapped. I only had a couple industrial ones from motorhomes, and one from a pump. Never had a request for one of them, so, they ended up going over the scales.
Ya I bet there are quite a few. The Galen books don't include much if it isn't performance related. Next to no slant 6 stuff. Industrial and marine info is almost nil.