KGJC616

Hi all, I just rebuilt a 04 Silverado 1500 5.3 and I'm looking for some opinions on extreme oil burning and oil in intake.

So here is the situation. The shop rebuilt the heads and bored the block 20 over then I built the engine. The engine didn't smoke for the first 50 miles or so then it slowly started smoking then more then a lot and started oil fouling all of my plugs.

Did leakdown test and all cylinders showed good.
I changed valve stem seals with no change in smoking/oil consumption.
Pulled intake off and about a quart of oil poured out of it. so replaced Driver side valve cover with updated baffle design hoping to stop oil getting into intake.

So now I'm wondering if this hole time the problem was with the rings maybe not seating and glazing the cylinder walls. I have 300-400 miles on engine.

The smoke is white but has a oil smell to it, doesn't smell like antifreeze.
possible bad head gaskets as well though

Any help would be awesome. I'm starting to pull hair out lol

kevinkpk

My bet, head gaskets. Were the heads milled? If so, or not, where they checked on a surface plane?

KGJC616

I'm not sure if they were milled, was a complete head rebuild so if they needed it I would assume they were.

kevinkpk

Might be a stupid question to you, but, did you put the heads on, and torque in sequence the bolts?

KGJC616

It's fine, not a stupid question. Yes I did put the heads on and yes I torqued to spec then put the degree on them as well. In the sequence the book said.

just fyi, this is my fourth engine rebuild

kevinkpk

Rings should have found their home in the cylinder,. Have you checked the pcv valve?

KGJC616

Yeah I was thinking the rings should have seated by now.

I replace the left/drivers side valve cover. The 04's have it basically built into the valve cover so you have to replace the whole thing. It's a non serviceable part. The PCV that is.