As far as I know, and I could be wrong, is that the 3.6L stroker conversions done by Brabus and RennTech on this engine involve using a crankshaft from the 350 diesel engine. I don't know what the rest of the configuration is though. I do know these guys get ~$13k for the job. The 3.6 M103 puts out nearly 275hp, not bad for a 2 valve sohc.

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1995 G320
1984 280GE
1971 Unimog 416