My first step would be to drain the oil and see what it looks like.
1969 Chevy RCLB C10 350/TH400 SOLD
2007 Chevy RCSB 4.8 4x4 LS SOLD
2008 Chevy RCSB 5.3 4x4 LT SOLD
2010 Chevy CCSB 6.2 4x4 LT SOLD
2005 GMC CCLB DRW 6.6 Duramax 4x4 191,000 and counting
2013 FORD CCSB F350 6.7 Powerstroke 4x4
Thanks for the input guys. I finally have a day off tomorrow so I guess im gonna yank the engine down and see what it looks like...if its too much to fix I have a buddy thats got another 4.8 out of his truck he wrecked with only 48,000 miles he said he would sell me for $350. Its complete down to the AC pump
2001 GMC Sierra 4.8
lowerd 2in in rear
custom cat-back
and the ever so mighty K&N
-"Faster, Faster until the thrill of speed overcomes the fear of death."
-Load it like a Freight Car
-Polish it like a Show car
-Drive it like a NASCAR
for the amount of money it would cost to fix just about anything that could be causing your problems, you're probably better off buying that very low mileage engine anway. Especially seeing as you have 432423789752 miles on your engine.
Yeah, for $350 i would just swap and scrap.
2013 CC 5.3
81 C10 LS1 project