Based loosely on an Olds 350 maybe...wait, those were converted with pistons and top end because no matter how bad a 350 Olds gas engine is, the diesel was that much worse. A 6.2 diesel has nothing to do with a 350 other than a bowtie. Is Eric Sidvers still a big guy over at the diesel place? I know him from a previous forum life and I am a member there but have not been there in years.