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

[swathdiver]

Took valve covers off. Broken exhaust valve spring.
Also any suggestions on how to replace them. Gonna research YouTube and such. Any tools to make it better, whatever info you got is appreciated.

View attachment 262161

https://www.summitracing.com/parts/cca-5462

Improved Rocker Cover - 12642655

Stock springs or LS6 springs should be fine. Glad it wasn't something inside the motor!

 

[swathdiver]

Youngest daughter and I changed the engine oil and filter today. 5,273 miles and 171 hours. OLM said 42%.

 

[CaptainAmerica1]

Just springs for now. And ill oder the new updated valve cover.

So glad it wasn’t worse buddy.

 

[kbuskill]

Just springs for now. And ill oder the new updated valve cover.

How many miles on that engine?

What type of oil do you run?

How many miles between oil changes?

Sorry for all the questions, just curious.

 

[Tonyrodz]

https://www.summitracing.com/parts/cca-5462

Improved Rocker Cover - 12642655

Stock springs or LS6 springs should be fine. Glad it wasn't something inside the motor!

A little cheaper--

 

[Idriveaho]

Seems better than originally thought! Have you been able to endoscope the cylinder to make sure there's no debris?

No, I do not have such tool right now.

How many miles on that engine?

What type of oil do you run?

How many miles between oil changes?

Sorry for all the questions, just curious.

5w30 whatever the chevy dealer was using. Was doing that for the bs warranty I bought for service records but now I'll be doing it myself.

175k on motor

And about 3k or 3 months. I knew to keep the oil clean for the afm. I have the range in it since at least 5 months ago.

 

[Idriveaho]

A little cheaper--View attachment 262190

Seen this on amazon

https://www.amazon.com/HELLO-Spring...ocphy=9016150&hvtargid=pla-967054006519&psc=1

Also this one looked interesting.

https://www.amazon.com/dp/B08HS2RC8...9Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU=

 

[kbuskill]

No, I do not have such tool right now.



5w30 whatever the chevy dealer was using. Was doing that for the bs warranty I bought for service records but now I'll be doing it myself.

175k on motor

And about 3k or 3 months. I knew to keep the oil clean for the afm. I have the range in it since at least 5 months ago.

I wonder if it was conventional oil and not synthetic?

 

[iamdub]

Took valve covers off. Broken exhaust valve spring. And broke the wire to inspect plugs. Just gonna replace wires and plugs while I’m at it. I’m guessing I have the outdated valve cover. What do you guys suggest on what valve springs to replace and plugs.

Also any suggestions on how to replace them. Gonna research YouTube and such. Any tools to make it better, whatever info you got is appreciated.

View attachment 262161View attachment 262162 View attachment 262163 View attachment 262164

See there?! And you were about to drag it to a shop far away. You can fix this. Tedious and painfully repetitive, but relatively easy. You're one lucky mofo!

Get you some new OEM ACDelco Original (not "AC Delco Professional" and SURELY not "AC Delco Advantage") wires. I concur with getting the "LS6" valve springs. They're the across-the-board go-to for GM. Stock spark plugs (41-110, I think)- no reason at all for anything exotic. You do have the older style cover- do you keep track of how much oil, if any, your engine consumes? The updated cover as well as a catch can is highly recommended. Most any of the ~$15 ones on Amazon are just fine. Some come with a stainless scrubber pad in them now. If not, add one. No need for the $100+ ones.

 

[Idriveaho]

I wonder if it was conventional oil and not synthetic?

Synthetic. Same oil used in my wife's equinox that requires the dexos oil.