any idea how to dump some vacuum? I've not had this problem before...I usually dont have enough of something..

 

Well as a test you can cap off that port on the driver side valve cover.

 

I did notice(i'm just now thinking about it) that the engine did idle much better when i had the pcv on the driver side opened to the air, i didnt seem to struggle as much. I wonder if the much newer pcv on this valve cover is just for the gen 4 engines, not gen 3 stuff....

 

Just an update, it looks like I burned up about 2 1/2 quarts of oil between yesterday and today, it was telling me I was low on oil after work. Now I'm puzzled and bummed out.

 

Worth looking into.

My 2005 6.0 (GEN III LQ9) doesn't have the replaceable PCV valve on the drivers side cover (or anywhere) just a nipple to connect the hose from the intake. I'm running the OEM PCV system, no catch can with a 228/230 cam. I have zero issues with oil consumption or smoke. It's been a year since the build, rings, bearings, oil pump etc.

My 2005 valve cover part numbers are drivers (12570696) and passenger (12570697)

Driver Side



Pass Side

 

My 04 already had the same setup you do and on the little 4.8, it was fine but on the 6.0 not so much... My guess is that its blowing oil and what not in to the intake causing all the smoke but I need to find the root problem of the high crankcase pressures, the only thing i can think of is blowby. My rings are jacked or i have a cylinder that is seriously outta wack...either way I'll try to do a leak down test again or just pull heads and start measuring the cylinder bores.

 

You'd think with that much crankcase blowby you'd see it coming out the (removed) oil filler cap on the pass side and the pcv on the driver side during idle. It's odd that it started out of nowhere after the ring sealing process was done. Like you said it could be one piston/cylinder that's filling the intake then the other seven drawing and burning the oil.

 

that was the first test I did, got it warm and pulled those 2 off, with smoke coming out of the exhaust at idle, I expected it to be coming out of those two as well but no dice.

 

.030 over bore on Hypereutectic or Forged pistons? What type of ring pack?
How where the cylinder walls finished?
What where the ring gaps?

What oil are you running?

Valve guides don't usually go bad on these engines.

 

yes, hypereutectic pistons, total seal ring kit stock configuration(1.5x1.5x3.0mm) and gap is what i asked for when i took it to have the rotating assembly installed. The cylinder walls had been bored and honed at one shop and the rotating assembly installed at another shop. The first shop got to busy with race season to finish my stuff. I looked at the cylinder walls before the pistons were installed and it looked like a fresh hone, good crosshach. I dont have any pics.

Valvoline 5W-30, regular dinosaur oil