What did you do to your NBS GMT800 Tahoe/Yukon Today?

[iamdub]

Thank you for clearing this up. I keep my eyes peeled for a deal on some low mileage injectors and TB

This is the way. Some people or places value parts based on the vehicle they're from. An IM from "just an old work van" might be cheaper than one from a nice Silverado LTZ yet be exactly the same. Just like how, back in the day, a 6.0 from a Silverado SS was often pricier because it came from a special/rare truck while the 6.0 from an Escalade was sometimes cheaper because it was just a V8 from grandma's SUV. Yet, they were the exact same LQ9. For my S10, I bought an LQ9 from an Escalade cuz it was cheaper and was far less likely to have been beat on. Get the injectors professionally serviced and you'll be set in that aspect. Most places do the same work for around the same prices: Impedance test the coils, disassemble, ultrasonically clean, back flush, replace the "soft parts" (O-rings, pintles, caps, etc.), flow test for volume and spray pattern and return them with a printout of the results. I've used Injector Rx in the past and was happy. Was actually researching other places today just for comparison, but I'm gonna stick with Injector Rx.

 

[Rocket Man]

Intake manifolds from an actual TBSS, sure. But, you can get the same thing from a Gen4 4.8/5.3 engine, and likely at a much lower cost because it doesn't have that "TBSS" notoriety attached to it.




I meant used take-offs at those prices I listed. If you only buy new, then disregard my post. But, to directly answer your question- Yes. Swapping on a standard GenIV ("NNBS") intake manifold from a 4.8 or 5.3 (6.0 and 6.2 use rectangular port heads and manifold) is the same as swapping on an intake manifold from an actual TBSS. You can look at it as GM making the TBSS the standard IM for the GenIV engines. It's kinda like how they made the compression ration and cam specs (minus the AFM lobes) in the LMG (GenIV) the same as the famed L33 (GenIII). There are minor differences you'd have to account for such as the combination of correct fuel rails for the injectors you're running and there was a minor change in the '09+ manifolds for a vacuum port.

I didn’t know they were the same, never heard that. Or else I did and forgot, totally possible. I remember I didn’t do any of that because I ended up supercharger instead.

 

[mattbta]

I'm curious about intake upgrades...I've got a return style system with two fuel lines. Not super interested in adding the corvette piece, but if my rails/injectors swap over and then it is just a matter of throttle body adapter, might be easier than I thought. Also not interested in the unobtainium/spendy electronic TB device at this point.

 

[iamdub]

I didn’t know they were the same, never heard that. Or else I did and forgot, totally possible. I remember I didn’t do any of that because I ended up supercharger instead.

Yaaas. Boosting circumvents a lot of small shortcomings in one fell swoop. Belt-driven intake manifold FTW!

 

[RAMurphy]

I'm curious about intake upgrades...I've got a return style system with two fuel lines. Not super interested in adding the corvette piece, but if my rails/injectors swap over and then it is just a matter of throttle body adapter, might be easier than I thought. Also not interested in the unobtainium/spendy electronic TB device at this point.

Yes, having the return style (two fuel lines) does complicate the install. I spent a significant amount of time trying to find a two line fuel rail that would fit the TBSS intake manifold. Supposedly they are out there but not in my area or anywhere I could find, so I went with the corvette filter and made it work. I also bought a new throttle body to take advantage of the bigger opening of the intake manifold. I do have the throttle body adapter which I purchased as a just in case thought. It's been installed now for 6-8 months now with a tweak tune from Black Bear Performance. I absolutely love it.

 

[Walchit]

Installed two new StrongArm (no, not Franklin D. Azar) liftgate struts. Now it raises by itself when I unlatch it. The cold temps in winter will be the real test.

View attachment 398064

I used to work out west, I remember the strong arm, lol

 

[ncalvo]

200!

 

[blueinkd]

Both heads at the machine shop for a valve job and cleaning. Having them replace the valve stem seals and new springs as well. Should have them back Tuesday. One of my lifters had pitting on the roller, causing the noise.

Well.....pulling the engine. Got the heads back and as we were pulling the cam, here comes a cam bearing. My buddy noted it was probably loose already. I was watching him baby the heck out of the cam as he pulled it and spinned it out. Can't really complain at +300k miles.

 

[MassHoe04]

200!View attachment 398308View attachment 398309

Welcome to the 200k Club! I'm about 213k now...

 

[Walchit]

Well.....pulling the engine. Got the heads back and as we were pulling the cam, here comes a cam bearing. My buddy noted it was probably loose already. I was watching him baby the heck out of the cam as he pulled it and spinned it out. Can't really complain at +300k miles.

#4 came out with my cam, started the whole scope creep thing, lol