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 - Stories From Old Farmer - by K. Pratt. Old Farmer, a.k.a. Dale Jensen began posting messages to our discussion forums at the grand age of 75. With extensive knowledge of farming and tractors, he valued the past and the ways that went with it. He shared these values with us until shortly before his passing. I spoke with Dale in his last days and requested his permission to share some of his stories with the readers of our magazine. He agreed, and provided the
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