I think of the L series engine as intended to be used more in local delivery trucks, mostly solo, or pulling light trailers, maybe 48,000 to 60,000 gross. I agree with Highway OPie that you will want to check the gearing especially if the truck started out life as a local delivery., you may find that a 400+ hp engine with taller gears will give as good or better milage on a long run, and yet have that reserve for pulling the big hills. However if you are not going to pull a heavy trailer, and the gears are not to low you should do fine. I ran a L series cummins with 350 hp and had no problems at 80,000 until i hit a mountain pass, then got passed by bicycles...lol. I am planning on basing my conversion on a 450+ hp powerplant coupled to an 18speed. Realizing that I may give up a lot of resale value by not going with a freightshaker/volvo with an automatic, but just love the look of a classic Pete or KW.
Dave
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