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Hydro locked #1 cylinder

Old 01-02-2019, 09:28 PM
  #21  
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Originally Posted by Che70velle View Post
Iíve never seen a valve stem go up the intake. Thatís a first for me personally.
Its impossible to put into words how fast everything moves around during an event like this. There will be witness marks on stuff that shouldnít have them. Having said that, is there a mark on the bottom of the valve cover, directly above the suicidal intake valve by chance?
Nope, no damage at all to the valve cover.
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Old 01-02-2019, 09:31 PM
  #22  
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Some more pictures with the heads off, looks like I wont have to get the cylinder resleeved.


c


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Old 01-02-2019, 09:40 PM
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It's ugly but it could have been worse.
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Old 01-02-2019, 11:40 PM
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Originally Posted by 01CamaroSSTx View Post
It's ugly but it could have been worse.
For a fact! Looks like the head got the worst of it.
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Old 01-03-2019, 01:45 AM
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Originally Posted by 01CamaroSSTx View Post
It's ugly but it could have been worse.
Definitely got off easy, I've seen the damage that it causes when they let go at 7,000+ rpm and it's not pretty.
I don't see any obvious signs of piston the valve contact prior to the valve breaking but I would double check piston to valve clearance when it gets put back together.

As far as the cause it could have be one of several, Usually it involves piston to valve contact but it can also be just plain ol fatigue. On race engines it seems to happen when you run to many rpms. Sometimes the cause is obvious like a missed shift or shifting into the wrong gear and over revving the engine.
Sure does suck but at least it's fixable and not a $60,000 engine lol
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Old 01-03-2019, 09:42 AM
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I’d be really interested to know what caused the valve to break with only 20 miles on it.
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Old 01-03-2019, 10:52 AM
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Originally Posted by KCS View Post
Iíd be really interested to know what caused the valve to break with only 20 miles on it.
That was my thoughts as well.
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Old 01-03-2019, 01:03 PM
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Originally Posted by KCS View Post
Iíd be really interested to know what caused the valve to break with only 20 miles on it.
The short block had 20 miles on it, I bought the heads used, had a local machine shop clean and pressure test them, and install the valve springs on them.
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Old 01-04-2019, 06:59 PM
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I contacted the seller I bought the rocker arms from, turns out there are not stock and that they're aftermarket arms.

I've seen a thread in the past where a guy had a failure with the aftermarket ls3 intake rocker arm with low miles. I think that the rocker might have broke first, which pushed down on the retainer, which allowed the valves to drop into the cylinder
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Old 01-04-2019, 09:56 PM
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Originally Posted by lawrenq View Post
I contacted the seller I bought the rocker arms from, turns out there are not stock and that they're aftermarket arms.

I've seen a thread in the past where a guy had a failure with the aftermarket ls3 intake rocker arm with low miles. I think that the rocker might have broke first, which pushed down on the retainer, which allowed the valves to drop into the cylinder
Possible but not likely. Looks like the typical valve failure.
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