6.5 Turbo diesels kick major ass. If you can't find one of those hit up a 6.2 out of a squarebody. They can't be beat. If ANYONE even mentions a duramax or cummins, flick them in the eye, laugh in their face and walk away cuz they are big, stupid, poopyheads.
Oh and there's absolutely NO information on the interwebz regarding diesel swaps so don't even try the Google. It's a futile effort.
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