The 6V92 is noisier,prone to oil leaks and has more power potential. The 555 is almost obsolete, easier to work on and very reliable. Part availability can be a problem but I've always found whatever I need for mine. The 555 was used in short haul trucks and off road/agricultural equipment. I love the sound of a 4 stroke V-8 too! My 555 is turbo-charged and has adequate power but comes up short in the hills. I've considered playing with the boost or adding propane but we're on vacation so I'm usually not in a hurry.
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1993 Newell 45'#316, 1976 Trans Am 455, 1967 GTO, 1953 Chevrolet 3105 (panel truck),1952 Chevrolet 3600,1969 Airstream Overlander. Always fixing something!
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