OK, Bought a 07 with a couple problems today.

SpareParts said:

Got the replacement engine tore down for the gaskets and seals im replacing.
Overall not bad looking on the inside, but the heads do have a little sludge built up in them. It's not hard and baked, just gooey.
Need to flip it on its side to clean that out so none of it gets into the engine pita, but i can't leave it in there.
The oil pan has some gunk in the bottom like the heads, but i did not see any sparkly stuff at all and that's a big relief!

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mikeyss said:

You may want to Google info about those 5364 heads. I believe they have some issues, so if your current engine has 821/823 heads, use those instead

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SpareParts said:

I actually did check on them as i had never seen them.
Are you thinking the 823 heads that are known to crack if they have a casting mark that looks like a battery?
As far as i can find reading 5364 heads are as good as the other two casting number heads you normally find on 6.2L engines.

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SpareParts said:

It is a 2007 Yukon XL Denali 1500. AWD 6.2L, 200K
It has the P0011 code and hot oil pressure is about 15PSI. Known when i bought it. It is in great shape with everything working except what could be a couple expensive problems im willing to fix.
1: VVT code P0011.
2: Rear shocks are blown. Pump is good.
Minor problems are.
1: All TPMS sensors read 148PSI but the scanner says all 4 batteries are ok.
2: Driving during the day it is very hard to see the dash gauges. I have to turn on the park lights to get the dash lights to come on so i can comfortably see the gauges.

Other then this stuff its in really great shape. Drives nice, No Dents, all glass good, No rips holes in the interior and other then a few rock chips on the front paint is good.
So tackle the expensive VVT first.
The engine does not make any strange noises but it was not cold and had been run from his house to the parking lot where we met.
After driving about 150 miles home with StabiliTrak warning coming on and off. No check engine light till i got into my driveway and it turned on.
Hot oil pressure is about 15PSI.
I have read a lot about fixing the VVT but nothing guaranteed to fix it.
I going to order the 3 new parts most replace and change them but,
I also notice the oil pressure gauge is really sluggish. From idle if i rev the engine to say 2K it takes a few seconds for the oil pressure to get up to 40PSI, when return back to idle the gauge will take maybe 7 seconds to return to 15PSI.
Im wondering if my engine has that screen and if so it might be clogged with gunk causing the sluggish gauge and possibly VVT not working properly?

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