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

[Rocket Man]

As far as I know the valve covers are the same on all of the gen 4 LS engines aren't they?

I believe so, I know the Gen 3 were the ones they came out with an updated one for. I put one on my 6.0.

 

[R3cord303]

I believe so, I know the Gen 3 were the ones they came out with an updated one for. I put one on my 6.0.

My gen 4 5.3 had a tsb for one as well. ***** weird

 

[iamdub]

maybe it was @iamdub then, somebody did it....

I bought the updated one then, when I went to install it, found mine had already been updated so I sold the one I bought.

As far as I know the valve covers are the same on all of the gen 4 LS engines aren't they?

I think there's a total of three different designs. They all have the same basic casting and bolt pattern. The '07-'09 have one style of PCV nipple and the "faulty" PCV baffle with the hole in poorly thought out location. There's a cover with the revised PCV baffle thaat relocates the hole but retains the PCV nipple for the original hose to attach to. Then there's a third design that has the revised PCV baffle as well as a revised PCV nipple for the hose that the 2010+ have.

I believe so, I know the Gen 3 were the ones they came out with an updated one for. I put one on my 6.0.

Maybe? I only know of the updated one for the Gen4. Although, the updated one can be used on the Gen3. The nipple style doesn't matter if you have a catch can with regular hose and clamps.

 

[Rocket Man]

I bought the updated one then, when I went to install it, found mine had already been updated so I sold the one I bought.



I think there's a total of three different designs. They all have the same basic casting and bolt pattern. The '07-'09 have one style of PCV nipple and the "faulty" PCV baffle with the hole in poorly thought out location. There's a cover with the revised PCV baffle thaat relocates the hole but retains the PCV nipple for the original hose to attach to. Then there's a third design that has the revised PCV baffle as well as a revised PCV nipple for the hose that the 2010+ have.

Maybe? I only know of the updated one for the Gen4. Although, the updated one can be used on the Gen3. The nipple style doesn't matter if you have a catch can with regular hose and clamps.

You’re right, the TSB for the gen 3 is an updated pcv valve itself in the original valve cover. I installed the updated gen 4 in mine. And you can just use the original hose, just add a clamp iirc. I know I was running it without a catch can.

 

[R3cord303]

You’re right, the TSB for the gen 3 is an updated pcv valve itself in the original valve cover. I installed the updated gen 4 in mine. And you can just use the original hose, just add a clamp iirc. I know I was running it without a catch can.

I didn’t use any hose clamps on my catch can install. All of the barb fittings seems super duper snug on the 3/8 hose- and the OE pcv system doesn’t use any?

 

[R3cord303]

The alignment for sure helped the way the 07 drives now that it has the RC leveling spacers. I may post an actual review of them in the suspension-

 

[Rocket Man]

I didn’t use any hose clamps on my catch can install. All of the barb fittings seems super duper snug on the 3/8 hose- and the OE pcv system doesn’t use any?

I put clamps on every hose in every location, not saying you need to. But if I’m looking for vacuum leaks, I don’t want to start questioning whether that hose without a clamp might be the culprit. The problem I could see is that hoses tend to relax after a few years and although they might not leak initially that doesn’t mean they won’t later. Most catch can kits come with clamps. Mine came with AN fittings and spring clamps for the places where an AN couldn't be used.

 

[R3cord303]

I put clamps on every hose in every location, not saying you need to. But if I’m looking for vacuum leaks, I don’t want to start questioning whether that hose without a clamp might be the culprit. The problem I could see is that hoses tend to relax after a few years and although they might not leak initially that doesn’t mean they won’t later. Most catch can kits come with clamps. Mine came with AN fittings and spring clamps for the places where an AN couldn't be used.

View attachment 231828 View attachment 231829

Thats fair. I will put clamps on when I have some that're an appropriate size. When I do my oil cooler I'll be using AN fittings. I have the adapter to run hoses to a cooler but I need to order the cooler and fittings. One of those things I have to get around to.

 

[gooffeyguy]

Worm gear clamps or spring clamps

Lol

.

2001 Yukon SLT
2012 Yukon Denali XL
2011 Yukon Denali RIP 5/20/18

 

[wjburken]

Worm gear clamps or spring clamps

Lol

Poking the bear are we?