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Re: Diesel engine swap
Unless you are going with a carb, forget about trying to make decent power out of a 454 North of 350hp....the fuel injection (stock stuff) just cant support it. An 8.1 can make around 350-400hp and be tuned really easily (same as LS), but North of those numbers you are talking BIG $'s to swap out better internals in the engine.
As far as pulling comfort.... all of these big blocks in stock trim will pull about as well as a 6.0, but they won't be screaming in 2nd gear on every little hill.
Depending on how often you will be pulling heavy, I would lean towards the LS 5.3/6.0 if its only a few times per year. If you plan on every weekend, I would be hunting an 8.1 or Cummins.
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