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

[PG01]

Where'd you find them? Jy? We need details!

Escalade?

 

[Bear77]

I’m thinking a Cadillac...


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[PG01]

???

 

[rgosart]

Where'd you find them? Jy? We need details!

They were on ebay. I was looking for the bottom left button because mine does not work and I came across these. No details on what they came from.

 

[mattbta]

Discovered cracked Castech heads right at the start of the COVID lockdown (mid March). Ordered a pair of refurbs from a place in CA that got good reviews. One was a castech, the other not. Took my sweet time installing, some weeks I wouldn't even work on it. Buttoned back up mid June and drove less than 500 miles by mid July. Noticed coolant level still lowering...not good. Emptied new catch can - milkshake. Pulled valve covers - milkshake.

Depressed and dejected, I let her sit until this week. I didn't know at that point if I did something wrong installing or got bum parts or both.

Got some coolant dye for Dex and circulated it. Pulled the valve covers again and cleaned up the heads so no dye was visible. Pressurized the system and waited. Found a crack in the Castech refurb in the same damned spot as the original head. Very strange. Waiting on response from vendor about warranty replacement. Sucks, but I'm still not in a hurry.

You can see the crack under the blue bubbles.

 

[Sam Harris]

Discovered cracked Castech heads right at the start of the COVID lockdown (mid March). Ordered a pair of refurbs from a place in CA that got good reviews. One was a castech, the other not. Took my sweet time installing, some weeks I wouldn't even work on it. Buttoned back up mid June and drove less than 500 miles by mid July. Noticed coolant level still lowering...not good. Emptied new catch can - milkshake. Pulled valve covers - milkshake.

Depressed and dejected, I let her sit until this week. I didn't know at that point if I did something wrong installing or got bum parts or both.

Got some coolant dye for Dex and circulated it. Pulled the valve covers again and cleaned up the heads so no dye was visible. Pressurized the system and waited. Found a crack in the Castech refurb in the same damned spot as the original head. Very strange. Waiting on response from vendor about warranty replacement. Sucks, but I'm still not in a hurry.

You can see the crack under the blue bubbles.

View attachment 254782

Do not like. Sounds like the seller is just taking advantage. How do you sell a cracked head as a replacement for a cracked head..?!? Bastards.

 

[mattbta]

Do not like. Sounds like the seller is just taking advantage. How do you sell a cracked head as a replacement for a cracked head..?!? Bastards.

That's the kicker. Their site is very specific about using a Sunnen pressure tester to make sure no bad ones go out. I'm kicking myself for not inspecting them super closely before installing....because now I don't know if it was already cracked (presumably) or developed in less than 500 miles (unlikely).

 

[Keviebear86]

I was finally able to install and set up my Stinger Heigh10 head unit. Once I get the time and motivation to install the amps speakers and build a box for my sub I'll post more updates. Anyone else doing anything for HD audio in their NBS?

 

[Tonyrodz]

That's the kicker. Their site is very specific about using a Sunnen pressure tester to make sure no bad ones go out. I'm kicking myself for not inspecting them super closely before installing....because now I don't know if it was already cracked (presumably) or developed in less than 500 miles (unlikely).

Not only that, how can they give you 2 different heads??

 

[mattbta]

Not only that, how can they give you 2 different heads??

They are both 706's...just different casting manufacturers.