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Re: will a 455 olds drop in where a 350 olds was?
Posted to Technical Discussion Forum on 5/17/2016

They called them "BOP" motors because they all three (and Cadillac also) used the same transmission bolt pattern, which are all the same, but different from Chevy, who used their own bolt pattern.

Other than that, their is nothing interchangeable about BOP e... Login to read more.