So every single 5.3 out there should last at least 250K with no issues just by changing the oil and air filter? BS. It was one lifter that went bad. After 160K. Out of how many hundreds of thousands GM made, you can't imagine a single lifter or any other engine part having an issue before 250K even if properly maintained? GM's QC might be good, but it's not THAT good. Like I have said before, the rest of the engine was fine. I got the block, heads, crank, and rods back from the machinist and the most they did was a light hone to clean up the cylinders and lightly mill the heads to clean them up. Valves, rods, etc were all fine. When I pulled it apart the bearings were all fine, only the rear crank journal had one scratch in the bearing and the journal itself was perfectly fine. I can guarantee that you take one of those 250K+ motors and pull it apart and see just how good of shape it really is in. Just because it's still running doesn't mean it's doing anywhere close to its best or that it hasn't seen excessive wear.
I'm only going so far into this engine because it already has 160K on it (which despite what you seem to think is quite a lot of miles) and with needing to replace a lifter and cam I might as well tear the whole thing apart and build it up better than before. I plan on keeping this rig for a good long while, and even if I swap in a 6.2 later or something I'll still have a good 5.3 to use in a hot rod or sell to fund the swap.
I'm replacing the transmission as well with a reman even though I could probably be OK patching it back together as well or just run it until it leaves me stranded somewhere, but hey, peace of mind for me. These transmissions don't last forever behind the V8's on these heavy vehicles with oversize tires and full time 4wd.
You need to cut back on the sodium in your diet dude. All I've had to really fix so far previous to this engine was a torn CV boot which happens when you wheel it often, and the sunroof drains leaking which is a ridiculously common issue, and that's not "one thing after another". :roll: