The truck motors supposedly had more nickel in the block casting. The dual thermostats, higher flowing water pump, sodium filled valve stems and 4 ring piston add to the durability at higher power levels. When the trucks are working and pulling a load, your foot is a lot closer to the floor than a typical pickup truck application. You're using more of the available power vs. a passing maneuver in a car or pickup where you make high power for several seconds.
Not saying one couldn't build an equally durable 454 but as delivered from GM the truck motors are designed to live longer at working power levels.
Another aspect is that the shorter stroke of the 427/366 (same crankshaft) equals lower piston speed at a given RPM and adds to the longevity.
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Today's Featured Article - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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