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Broken Valve Seat in LS6 engine

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Old Jan 27, 2007 | 03:06 AM
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Default Broken Valve Seat in LS6 engine
I develop a metallic noise in my engine last week so I removed the heads and found damage all over the piston and in the head chamber. After removing the valves for that cylinder I could see that a chunk of the valve seat (about 1" long) had broken out and been chewed up in the cylinder.

Anyone ever heard of that before? The engine was running pretty hot at the time.

Are better valve seats available?

Do I need to rebuild the bottom end of the engine now?

Thanks

Coolvet
Last edited by Coolvet; Jan 27, 2007 at 07:51 AM. Reason: adding pics
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Old Jan 27, 2007 | 04:07 AM
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Any photo's? What was the valve damage?
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Old Jan 27, 2007 | 06:43 AM
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I don't know how to attach pics in this forum. Can I send them to your email address?
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Old Jan 27, 2007 | 07:01 AM
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I've seen seats fall out of heads. It usually takes a lot of heat to loosen the interference fit.
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Old Jan 27, 2007 | 07:11 AM
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the whole seat didn't fall out. A piece of the seat fell out. The piece was about 20% of a whole seat.
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Old Jan 27, 2007 | 07:47 AM
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Originally Posted by Coolvet
I don't know how to attach pics in this forum. Can I send them to your email address?
I will PM you my e-mail and then post the photos for you.
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Old Jan 27, 2007 | 08:14 AM
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Here is the damage.

How is the cylinder wall?






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Old Jan 27, 2007 | 08:17 AM
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Thanks for your help posting the pics Vettenuts.

There doesn't appear to be any damage to the cylinder wall.
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Old Jan 27, 2007 | 08:26 AM
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I guess I would always wonder if there were any unseen cracks in that piston. How many miles? It might be worth dropping the pan and replacing that one piston. You never know in these situations unfortunately.
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Old Jan 27, 2007 | 06:04 PM
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has anyone else seen this kind of broken valve seat before?
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Old Jan 27, 2007 | 09:21 PM
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I haven't. You might want to crosspost on LS1 Tech as well.
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Old Jan 27, 2007 | 11:11 PM
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That sucks. I wouldn't run that piston. Even if it wasn't cracked, it's probably going to develop hot spots now.

Why risk damaging the new head(s) you're going to be putting on there?
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Old Jan 28, 2007 | 07:59 AM
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I also posted recently about the fine job GM did on my valve seats. Yours may have been the same or worse.

My Intake Valve
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