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Well from what I remember, the 6b was introduced into the automotive world in 1986 as Cummins secured a contract with Dodge as an automotive supplier. Just as the 4.3 chevy is a 350 with the front two cylinders gone, The 4b is the 6b with the front two holes gone.

Not any real history there but many manufacturers have used that formula to keep the same products as to not retool for a new motor series. IE use what you have, reconfigure the engine around exsisting parts
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