5.9....
I would say the 5.9 is a great choice for buses under 25 ft. Anything bigger than that is going to make best use of the 8.3...
a 5.9 is like about 360 cubic inches... the size of most v-8s in pick up trucks
8 liter engines are like having 450 cubic inches to 500 cubic inches... like engine found in one ton trucks, those huge cadillacs and stuff in the middle seventies....
I would say a those big 40 footers would do really well with 10 liter big rig type engines.......but that is out of the question for most.
I am swapping frames and the engine in my 1954 ford.... lots of work involved.
william
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