It's not the most powerful engine, the early years of active fuel management (displacement on demand) had a few hiccups, but I hear story after story of very high-mileage 5.3's.
Bottom end is built very well, slightly oversquare (most of the cubic inches come from the bore) with a tough 6-bolt main. If you compare the bigger rods of a 5.3 to an older 350 it's night and day. Like I said not the most powerful, but It is a very solid, reliable motor. I have a theory that oversquare V engines last longer than undersquare V engines. I have no scientific evidence to base that on, but I will never buy an undersquare v8.
From my comparison the 5.3 has less vibration than a 6.0.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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