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 - Identifying Tractor Smells - by Curtis Von Fange. We are continuing our series on learning to talk the language of our tractor. Since we can’t actually talk to our tractors, though some of the older sect of farmers might disagree, we use our five physical senses to observe and construe what our iron age friends are trying to tell us. We have already talked about some of the colors the unit might leave as clues to its well-being. Now we are going to use our noses to diagnose particular smells. ELECTRICAL SMELLS
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