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Old 03-06-2019, 08:39 PM   #1 (permalink)
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250k 6.0 LS engine

I started digging into my 6.0 LQ4 250,000 mile engine. I heard it run briefly and nothing was knocking it sounded fine. Upon draining the oil all kinds of debris came out. I'm still not sure if it was metal shavings or organic matter. The engine was covered in rat shit. It sat without an intake also but even then I'm not sure how rats would get inside to the point the pan is filled with rats nest debris. But I can't find any evidence of damage to create metal shavings yet neither.

One rod bearing i pulled off looked a little iffy but still not metal shaving territory. If i still don't find any evidence of catastrophic damage I'm going to throw a new set of rod bearings at it, head gaskets and other general freshen up shit and send it but if anyone has any opinions on something I could be missing at this point let me know


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Old 03-06-2019, 09:06 PM   #2 (permalink)
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Is it a DOD engine?
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Old 03-06-2019, 09:10 PM   #3 (permalink)
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Is it a DOD engine?
no
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Old 03-06-2019, 09:21 PM   #4 (permalink)
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I would pull the cam personally. The cam bearings are known to spin on the early 6.0s.

And while you are in there a cam swap, valve springs, timing chain and oil pump is good upgrade too.

I've had more than 1 6.0 that looked decent but when removing the cam a bearing or 2 comes with it or falls out.
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Old 03-07-2019, 01:35 PM   #5 (permalink)
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I've never rebuilt an LS, but I would never go through an engine without at least changing rod and main bearings and piston rings. Valvesprings would be next on the list, along with a cam, if it's a flat tappet cam, and timing gears/chain.

Good luck
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Old 03-07-2019, 01:53 PM   #6 (permalink)
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Lifters like to suck on these motors. If it's going in my project I pull heads and do new lifters and baskets as well.
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Old 03-07-2019, 04:24 PM   #7 (permalink)
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It at least needs a valve job, but why not go all the way and rebore? it will be good for another 250+
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Old 03-07-2019, 04:30 PM   #8 (permalink)
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I have done quite a few 250k+ mile 6.0s and 5.3. I do a quick hone. New rings. Bearings Including cam bearings. Gaskets. Ls7 Lifters and basket. Ls2 timing chain. Oil pump and gaskets. Very rarely do I get a motor that's running that needs to be bored or any major machine work. The valve jobs I usually just clean and inspect heads and re lap the valves.
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