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 - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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