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Old 01-19-2008, 04:38 PM   #1 (permalink)
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855 Cummins

Hello all, new to the board, searching to find a few questions on a Cummins diesel. What is the difference between the Small Cam and the Big Cam? Is a 855 the same block? and is the NTC the same style of motor? I am looking for a Manual to buy for I believe a small cam 350 but do not know when the Big Cams first came in. Thanks for any help
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Old 01-19-2008, 11:05 PM   #2 (permalink)
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Not positive, but I think the Big Cam I came out in '77 or '78. They say Big Cam on the side of the block.

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Old 01-20-2008, 06:43 PM   #3 (permalink)
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Several differances between small and big cam. If you mean how can the uninitiated tell which is which, look at the left side of the block, below the pump. A big cam will say just that, BIG CAM cast into the block just under the lifter blocks. also the data plate on the left side of the accessory drive will say what it is. The 855 means 855 cubic inches. both big and small cam were 855 cubic inches, and NTC can be found in both small and big cam. in other words, you will find both 855 cubic inch Small Cam (which will NOT say small cam on it) NTC 300, NTC350 etc.... and 855 cubic inch Big Cam, Big Cam II, Big Cam III and Big Cam VI. There are several differances in parts mounted to both blocks, and most are interchangable. BUT! the blocks are differant, in that one has a cam size used by Cummins for years, and one has a much larger cam bearing diameter. One will not fit the other. The cam follower boxes are differant sizes also.
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Old 01-22-2008, 05:01 PM   #4 (permalink)
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Originally Posted by Dutchman1 View Post
Several differances between small and big cam. If you mean how can the uninitiated tell which is which, look at the left side of the block, below the pump. A big cam will say just that, BIG CAM cast into the block just under the lifter blocks. also the data plate on the left side of the accessory drive will say what it is. The 855 means 855 cubic inches. both big and small cam were 855 cubic inches, and NTC can be found in both small and big cam. in other words, you will find both 855 cubic inch Small Cam (which will NOT say small cam on it) NTC 300, NTC350 etc.... and 855 cubic inch Big Cam, Big Cam II, Big Cam III and Big Cam VI. There are several differances in parts mounted to both blocks, and most are interchangable. BUT! the blocks are differant, in that one has a cam size used by Cummins for years, and one has a much larger cam bearing diameter. One will not fit the other. The cam follower boxes are differant sizes also.
Exactly what Dutch said. In addition, the Big Cam has a different injector which provided greater injection pressure and resulted in higher HP.
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Old 01-23-2008, 05:57 AM   #5 (permalink)
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Question

Thanks for the replies, they have aided me considerably. I knew of the engine stamp of Big cam on the block and the different size camshafts. My concern was the block, which I realized the bore diameter was different but were the parts interchangeable. I was looking at a old cabover and saw the aftercooler and did not state big cam on the block. I did not know if the small cams came with a aftercooler or not. Thanks for the help.
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