What did you do to your NNBS GMT900 Tahoe/Yukon Today?

[swathdiver]

Plugged in my new tech2 and just spent about an hour checkin out all the different stuff that it does.
was able to see the trans fluid life is at 50%
Seen all the A/C temps and the only stored error is no comm. with the digital radio.

The fluid is dead, change it soonest.

 

[Trippers99hoe]

The Hoe has 87k on it so I plan on getting trans serviced and Diff service very soon.
My other car is down right now so It'll get done soon after I get it fixed.

 

[Just Fishing]

getting closer!
Valve covers are just on there to keep dust out of there for now.
I still need to order rockers...

 

[pwtr02ss]

Like looking at a work of art!
View attachment 305577

Don't forget the permitex on the rocker arm bolts if they are like ported stock heads. The bolt head is exposed in the runner and oil will seep into the cylinder.

 

[RooTBeeRthe1st]

I know some guys that did that to their S10's way back when.
Reports that it worked quite well when crawling around off-road at low speed.

Also this is where my air tool addiction would be handy.
Air saw/body saw!!!

I ordered one while being driven home from ocktoberfest...
(Not so sober me likes to buy sober me gifts, not so sober me is very thoughtful )

I used it to chop through a metal roof when redoin the roof on my motorhome project.
Like a hot knife through butter!!

Afterwards i never really found a good use for it.
until i saw this video.

So i decided what the heck, and bought a bunch of different blades.
Yup, i love this thing.
Using the courser blades, it's like a hot knife through mild steel!

Oh yeah, I love a good body saw!
Bought one of those a while back, haven't used it too much, but It definitely made a few jobs easier or even possible that wouldn't have been without it.

 

[Just Fishing]

Don't forget the permitex on the rocker arm bolts if they are like ported stock heads. The bolt head is exposed in the runner and oil will seep into the cylinder.

I have some high temp sealant ready to go.
Warning in the AFR manual about that too. lol

I'm still waiting on an answer from summit about those rocker arms as well.
I don't see any mention of the max spring dia.
I'm sure it will be fine, but i would love to confirm before i order...

 

[RooTBeeRthe1st]

I bought them from the same company. Direct purchase with shipping was cheaper than Amazon and free shipping.

I looked at options to see what I could do without cutting the reinforcement beneath.

Just cut everything except for the substructure to your newly purchased vents, even if that ends up blocking a little bit of airflow. Still end up better than you were before

 

[Just Fishing]

Spent some time yesterday thinking about oil flow and oil return after reading a note in my AFR head instructions.
They mentioned that a high flow pump can cause oil backup in the cylinder heads and could cause oil burning due to flooding of the valve stem seals.

So looking at the return path in the heads, I saw that the LS heads seem to have a real nice oil return path between each cylinder.


But those then drain into the lifter trays!

the lifter trays should drain oil out the bottom and overfill
not much room at the top of the lifter trays between the block and the head, but there is a pretty good opening under the head.

I found some information talking about drilling out those lifter trays to allow faster drain back, most seemed to be on the bottom of the trays between the webbing.
To me, it seems like the oil pools there in order to lube the lifters as they move up and down in the tray slot.
so i decided I didn't want to lessen the oil pooling there, but more help that oil return a little faster.

so i decided on this,


Just 3/8in holes, the oil return is in-between the two lifters.
So i opted to keep them off center and closer to the separator inside of the tray.
These also point towards the vally, and when installed they are at an angle.
so the location of the hole is just slightly under or real close to the level of the lower side (pointing towards the cylinders).

So in theory, this should help oil bleed out of the trays faster.

I also think it seems like oil should be in the trays, so i also added a small hole slightly below that line that crosses over to the other lifter.
In my head this should work as an oil balance port to ensure both sides keep oiled.
This plan was because it seemed like the trays had a cup in the middle to serve as an oil balance before the oil could overflow...

I had planned to get pictures of them installed in the block, but i was on a roll and totally forgot.

 

[FrankU]

Tahoe SS in the works ?

Is This A Prototype For A Chevy Tahoe SS?

One very quick and very loud prototype.

gmauthority.com

 

[Rocket Man]

Spent some time yesterday thinking about oil flow and oil return after reading a note in my AFR head instructions.
They mentioned that a high flow pump can cause oil backup in the cylinder heads and could cause oil burning due to flooding of the valve stem seals.

So looking at the return path in the heads, I saw that the LS heads seem to have a real nice oil return path between each cylinder.
View attachment 305689

But those then drain into the lifter trays!

the lifter trays should drain oil out the bottom and overfill
not much room at the top of the lifter trays between the block and the head, but there is a pretty good opening under the head.

I found some information talking about drilling out those lifter trays to allow faster drain back, most seemed to be on the bottom of the trays between the webbing.
To me, it seems like the oil pools there in order to lube the lifters as they move up and down in the tray slot.
so i decided I didn't want to lessen the oil pooling there, but more help that oil return a little faster.

so i decided on this,
View attachment 305690

Just 3/8in holes, the oil return is in-between the two lifters.
So i opted to keep them off center and closer to the separator inside of the tray.
These also point towards the vally, and when installed they are at an angle.
so the location of the hole is just slightly under or real close to the level of the lower side (pointing towards the cylinders).

So in theory, this should help oil bleed out of the trays faster.

I also think it seems like oil should be in the trays, so i also added a small hole slightly below that line that crosses over to the other lifter.
In my head this should work as an oil balance port to ensure both sides keep oiled.
This plan was because it seemed like the trays had a cup in the middle to serve as an oil balance before the oil could overflow...

I had planned to get pictures of them installed in the block, but i was on a roll and totally forgot.

So you’re redesigning part of the oiling system based on what experience or expertise exactly? Maybe just don’t use a high- flow pump.