gmcyukon

iTrader: (9)

bought this engine pretty cheap and took it apart. to built it. my dad thinks its burning oil so i have pics for you guys its a 5.3




cleaned piston 1 but it looked the same as others

gMAG

iTrader: (1)

Could be oil and/or overly rich mixture.
Did you do a compression test beforehand? That might give you a clue.
In the first picture, the lower coolant ports are completely blocked, compared to the upper ports. Did you clean/open the upper ports?

gmcyukon

iTrader: (9)

Didn't do a compression check and and i did clean it afterwards

gmcyukon

iTrader: (9)

Also the Lower pics are the right side (1.3.5.7)

3rdCoastPowerSports

iTrader: (5)

what are you wanting to do with this thing? are you looking to rebuild the bottom end? It definitely had something going into the combustion chambers. I agree with Gmag, it could be oil could be fuel.

gmcyukon

iTrader: (9)

Yea I going to rebuild the bottom end

GMtechmatt

id say it is . what year 5.3 is it? some with active fuel managment when the AFM goes they will consume oil. or if the oil diverter isnt installed over the oil squirter it will consume. also locked up rings will consume

gmcyukon

iTrader: (9)

It's gotta be 2000 or and 01