Exhaust bolts

[roadiemanchild]

Should I replace the exhaust manifold studs now with better

quality studs before they fail?

[roadiemanchild]

I have a 2017, 6.2 Silverado 

[CamGTP]

It's up to you. I have 101k miles on my 2016 and all the bolts are still there.

[davester]

I would suggest doing it at say 100k miles, around when you would do the spark plugs.  It won't be that much money, and certainly a lot easier and faster to do if they aren't broken than if one or more have.

 

When I bought my truck, a bunch of the bolts were broken off (3 on each side).  I managed to get out all the broken ones in the middle of the heads, and bought Dorman exhaust manifold clamps for the end ones that I couldn't get out  and new 10.9 flange head bolts for the rest, and since then, the only problem I've had with them is one of the clamping bolts came loose and I got a loud exhaust tick happening (so far, put on about 100k km on the truck since then).  Put on a jam nut and it shouldn't happen again.

[Nitrousbird]

The question is do the GEN-V motors have the same garbage exhaust manifold bolts that were used in the GEN-III and GEN-IV motors.  If so, replace them.

 

I haven't researched it yet, but if they do I will be swapping to better bolts once the warranty is up.  My last truck had the L92 - previous owner had to pull the head on one side to have a couple extracted and I did the other side with new bolts and one of the fix-it solutions for a broken one.  Before than I had a truck with the LM7 and had several broken bolts.

 

So if these are garbage, it is very wise to replace before failure.

[cs15dah]

On 12/22/2019 at 4:09 AM, davester said:

When I bought my truck, a bunch of the bolts were broken off (3 on each side).  I managed to get out all the broken ones in the middle of the heads, and bought Dorman exhaust manifold clamps for the end ones that I couldn't get out...

Anyone know what part number Dorman exhaust manifold end clamps would fit for a 2015 Suburban? I’ve tried searching online, without any luck.

[davester]

7 hours ago, cs15dah said:

Anyone know what part number Dorman exhaust manifold end clamps would fit for a 2015 Suburban? I’ve tried searching online, without any luck.

best place would be dormanproducts.com   I think they also have a chat feature, but can't confirm as site is down for maintenance right now.

[swathdiver]

Dorman or ARP.  They will corrode because of dissimilar metals, the aluminum heads.

[L86 All Terrain]

I would if your already in there doing plugs or something. They are garbage studs. I had to change one that broke on my 2015 HD in 2018 for a commercial safety, so there isn't much of a longevity factor there. Truck only had 70,000km or 45,000mi at the time.