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

[Tonyrodz]

Any updates on your Tahoe?

Nothing yet. I'm not gonna bust his chops--yet!

 

[Dantheman1540]

Nothing yet. I'm not gonna bust his chops--yet!

I might finally be pulling the motor out of my Silverado next week so don't let me beat you to the burnouts!

 

[Tonyrodz]

I might finally be pulling the motor out of my Silverado next week so don't let me beat you to the burnouts!

What're you doing to it? What's the plan?

 

[Dantheman1540]

What're you doing to it? What's the plan?

Pull out to tear down and identify the point of failure. Which I honestly have no idea what happened Long WOT pull from 2nd through 3rd gear and just a bit into 4th at about 90mph or so and it completely nosed over. I didn't hear a pop or anything but it was just holding a rough idle of about 150-250rpm and low oil pressure around 5psi. However I think that's all the pressure it should have at 200rpm. Tried to start it once and It sounded like something was grinding. Pulled it home and checked plugs, they looked good so I bored scoped the cylinders which also looked good. Drained oil and it looked good, cut open the filter and it looked good. So I have no freaking idea. I need to pull the blower and valve covers and see if anything obvious is wrong before I pull it.

My assumption is cam bearing spun and block is likely trashed as that is what happened to this block originally. If that's the case then I will likely build a forged 408.

 

[Dantheman1540]

I had a solid 70psi of Oil pressure throughout the pull before it nosed over and was only running about 8-9psi of boost. AFR also looked good.

 

[Tonyrodz]

Pull out to tear down and identify the point of failure. Which I honestly have no idea what happened Long WOT pull from 2nd through 3rd gear and just a bit into 4th at about 90mph or so and it completely nosed over. I didn't hear a pop or anything but it was just holding a rough idle of about 150-250rpm and low oil pressure around 5psi. However I think that's all the pressure it should have at 200rpm. Tried to start it once and It sounded like something was grinding. Pulled it home and checked plugs, they looked good so I bored scoped the cylinders which also looked good. Drained oil and it looked good, cut open the filter and it looked good. So I have no freaking idea. I need to pull the blower and valve covers and see if anything obvious is wrong before I pull it.

My assumption is cam bearing spun and block is likely trashed as that is what happened to this block originally. If that's the case then I will likely build a forged 408.

I had a solid 70psi of Oil pressure throughout the pull before it nosed over and was only running about 8-9psi of boost. AFR also looked good.

That def doesn't sound good. I'm wondering what my guy is gonna find when he pulls out my old cam.

 

[Dantheman1540]

That def doesn't sound good. I'm wondering what my guy is gonna find when he pulls out my old cam.

Maybe with a little luck one of us can salvage our cams.

 

[Tonyrodz]

Maybe with a little luck one of us can salvage our cams.

I'm not gonna hold my breath tho. On another note--just ordered the Fleece hi/low mod.

 

[Dantheman1540]

I'm not gonna hold my breath tho. On another note--just ordered the Fleece hi/low mod.

I like my Fleace hi/low a lot. easiest mod every.

 

[ivin74]

I'm not gonna hold my breath tho. On another note--just ordered the Fleece hi/low mod.

I installed mine today. I didn't like the rigged 4hi, so I bought the fleece module. P&P