Worked great for me for many years of farm hauling, current owner still drives it, don't know of his success. I owned a used Freightliner with a small cam that had just been overhauled when I bought it. Posted 16:46 (#5844379 - in reply to #5844368) Subject: RE: 855 CumminsĪctually quite a bit, but the cam is the most popular, first was small cam (but not called that until the big cams came out, kinda like the Great War and WW11 ) then big cam then big 2,3,and 4, and then it turned into a N14 Even with the big cams if the over head isn't set properly you can chew up a cam in a hurry esp. They had trouble with the small cams eating lobes. More surface area for the cam followers to run on. This engine replaced the Small Cam 855 series engines and it features a greater camshaft diameter and the introduction of top-stop injectors. The first Big Cam I engines were introduced in 1976.Ĭummins aimed to meet new US government legislation at that time regarding noise levels and clean air requirements. A bigger diameter cam shaft, not more lift. I always thought the big cam was exactly that. What's the difference between a small cam and a big cam 855 Cummins?

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Cummins 350 big cam valve adjustment