Re: Engine swap from a 392 gas to a 5.9 Cummins
No, I believe such swaps are much talked about and seldom completed. If you are getting 7 MPG with gasoline you are doing very well. Mine got around 4. The stick shift no doubt helps, compared with the AT545 automatic I had. Getting 12 MPG with a diesel may be doable, but don't count on it.
If you do pursue this, I suggest you buy the engine and manual tranny as a compete unit out of a commercial truck -- with crossmembers and everything you will need. And the rear end at the same time. But Dawg, you can buy a lot of gasoline for what this would cost.
My hunch is you'll be better off scouring the country for a diesel bus with stick shift.
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