I've done both and was driving big rigs in 1970. Was also a diesel tech. If my history is "obvious" to you with such little information, you must be a pretty lousy researcher.
Your comments about the 855s and 903s are pretty-much meaningless unless you specify which engine models.
But since you seem to favor the 855 engine, you are supporting everything I said, not contradicting it. Did you note where I mentioned stroke versus bore being the main factor with torque?
Note that the 855 is a long-stroke engine with 5 1/2" bore and 6" stroke, and the 903 a short-stroke engine with 5 1/2" bore and only 4 3/4" stroke. That goes along perfectly with what I already stated. So, thanks for supporting my statements, although it seems you either did not read them, or don't understand them.
By the way, one of the best marine Cummins turbo 903s puts out 1200 lbs. of torque at 2200 RPM. Some turbo 855s puts only make 800 lbs.
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