So to tell the older 855 from the newer block, they called the new block the "Big Cam" as that was the main differance between it in the older "small cam" engine. They were haveing trouble with cam lobes wearing, and incressed the size of the cam allowing for longer "ramp" times on the lobes. It had small bores then was bored out to 855 CID. They stopped useing the "A", as most of their turbo engines from the 70's on were aftercooled.Ĭummins truck block went thru many changes. ![]() What are the specs and ratings of these various Big Cams and what is their maximum hp/torque?Ĭ= "custom" rated (doesn't really mean much) I am correct in thinking that the NTA-prefix means that the engine is aftercooled? The NTC- has a centrifugal water pump? Are all BC2's NTC300's? Is the "350 cummins" the BC3 NTC350? What about the NTA855? I saw it rated at as much as 525 hp. pdf file from the library and read it but I am still confused. The numbering system and ratings are confusing. I need some help understanding the Cummins Big Cam engines. ![]() By erich.vongeist - Sunday, Septem7:52 AM
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