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Old 10-30-2013, 09:45 PM   #15
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Pretty sure a 6.2 or 6.5 diesel has the same bellhousing pattern as the 454, and your MH most likely has a turbo 400. So at least that can bolt up, once you make new engine mounts. T400 is strong enough for the 6.2/6.5 and would be the easiest swap. The 6.2/6.5 is mechanical rotary injection and has no electronics. Same basic elecrical connections as your 454. A Duramax is electronic controlled, so is Allison auto trans. Both need a computer to run them. 6.2/6.5 is about similar size to 454, so it should fit without too much hassles.

An older Cummins 12V is also a mechanical injected and would be another easier swap. You can get Cummins to T400 adapters. By keeping your trans it makes the process much easier as you only change engine mounts and exhaust. Not driveshafts, trans mounts, cooling lines or shifter.

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Old 10-31-2013, 04:45 PM   #16
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I can understand the benefits of a duramax, but the benefits of a 6.2/6.5 or 12V cummins doesnt seem worth the effort to me. Especially a 12V cummins, that would rattle your teeth out! I would need to wear noise cancelling headphones, man them puppies are loud. I sat in a tiffin FRED at my storage place when they started it up. I know they get significantly quieter when warm but HOLY #%$!&* was it loud in the passenger seat.

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