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Purchased "fixed" heads from vendor, still dropped a valve <500 miles

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Old 04-19-2017, 11:35 PM   #1
BrandonScott
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Default Purchased "fixed" heads from vendor, still dropped a valve <500 miles

I have a 2006 C6Z that has about 41k miles on it. About a month ago I decided to order a stage 2 cam and fixed pre-assembled heads cause I've heard too many stories of dropped valves. I let an ASE certified mechanic install the heads/cam/tune. Well the other day I was in 2nd when I felt the RPMs hiccup and instantly fall to 0. I see white smoke coming from behind me. I let the car coast to the side of the road when I see a giant trail of coolant and some oil. I had the car towed to a mechanic here in town who inspected it for me. He says the car dropped a valve which went into the piston and pushed a rod thru the block. I guess my question is, am I just completely out an engine, or does the vendor hold any liability? I understand there's in inherent risk with these sort of things but I have to imagine there was some sort of defect on the supplied heads. Thanks for any input.



Last edited by BrandonScott; 04-20-2017 at 11:31 AM.
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Old 04-19-2017, 11:39 PM   #2
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what did the vendor say?
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Old 04-20-2017, 12:18 AM   #3
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what did the vendor say?
My mechanic just examined the car tonight so I haven't talked to the vendor yet. I was just wondering if other people had any sort of similar experience or advice.
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Old 04-20-2017, 12:25 AM   #4
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Valve float and valve head kissed a piston, or valve head broke off? Were the springs compatible with your cam and the valves that were installed in the heads? What valve broke (int/exh)? Were they reused stock valves? Were they inspected before reusing?
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Old 04-20-2017, 12:34 AM   #5
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Look for any witness marks on the top of the valve tips, retainers, etc.

Stock valves? What springs, retainers, exactly what cam, lifters and pushrod length? What vendor?
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Old 04-20-2017, 03:14 AM   #6
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The dropped valve issue impacts a small number of LS7 engines.

Sorry to hear about your engine failure OP. But some posters here have done a great job of creating hysteria for new Z06 owners.
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Old 04-20-2017, 05:00 AM   #7
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Quote:
Originally Posted by Datrojan View Post
The dropped valve issue impacts a small number of LS7 engines.
Stop spreading ignorance.

Last edited by lrobe22; 04-20-2017 at 05:00 AM.
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Old 04-20-2017, 06:48 AM   #8
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Quote:
Originally Posted by Datrojan View Post
The dropped valve issue impacts a small number of LS7 engines.

Sorry to hear about your engine failure OP. But some posters here have done a great job of creating hysteria for new Z06 owners.
Not more of this ****.
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Old 04-20-2017, 09:31 AM   #9
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So the following specs are for the heads/cam I had installed. Going to try and contact the vendor when they open up in a couple hours.

1.61" Hollow-Stem Exhaust Valve
2.200" Titanium Intake Valve
.660 Spring Kit w/ Titanium retainers
7.800 Chromoly LS7 Pushrods, 3/8 Diameter with 5/16 Ball Ends
Cam- 234/246 .635/.635 (w1.8 rockers) 115+3 LSA

This was all fully assembled prior to arriving to me.
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Old 04-20-2017, 09:48 AM   #10
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Wow, this sucks big time...
Who was the vendor???
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Old 04-20-2017, 09:58 AM   #11
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This sucks. Sorry to hear about it.....

Seeing how the vendor did not perform the actually head/cam swap, or tune it afterword, I think you are S.O.L. for any sort of compensation from the vendor. If the head is intact, and you can get some measurements off the head that proves gross error in the part of the machine work, you might have a good argument.

Your tune calibration should also be reviewed. Was the rev limiter increased?

The installer also shares some of this, until you can figure out exactly what failed, and why.
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Old 04-20-2017, 10:11 AM   #12
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Quote:
Originally Posted by lrobe22 View Post
Stop spreading ignorance.

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Old 04-20-2017, 10:30 AM   #13
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interested as to how this turns out.

sucks to hear, though....
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Old 04-20-2017, 10:33 AM   #14
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Not knowing anything about the Vendor, you or what was actually done for the tune. I would find it very unlikely that they will offer any compensation. Why would they or more importantly, why should they? If the vendor completed the install, tune, etc...yes, I would expect them to stand up. But, they didn't and you have no idea if it was something they did, if it was in the tune, or what? I wish you all the luck but all I see is people pointing fingers at each other saying "it wasn't what I did that caused it to fail". I don't have near the build knowledge that others have but it seems like common sense to me.

On a side note...this has nothing to do with the LS7, factory valve/value guide issue. This is an aftermarket install not OEM. It's hard to lump them all together IMO.

Again Good Luck!

Last edited by MH663; 04-20-2017 at 10:57 AM.
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Old 04-20-2017, 10:43 AM   #15
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Old 04-20-2017, 10:57 AM   #16
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Quote:
Originally Posted by MH663 View Post
Not knowing anything about the Vendor, you or what was actually done for the tune. I would find it very unlikely that they will offer any compensation. Why would they or more importantly, why should they? If the vendor completed the install, tune, etc...yes, I would expect them to stand up. But, they didn't and you have no idea if it was something they did, if it was in the tune, or what? I wish you all the luck but all I see is people pointing fingers at each other saying "it wasn't what I did that caused it to fail". I don't have near the build knowledge that others have but it seems like common sense to me.

On a side note...this has nothing to do with the LS7, factory valve/value guide issue. This is an aftermarket install not OEM. It's hard lump it all together IMO.

Again Good Luck!
I find it unlikely they will do anything as well. I'm just trying to gather any advice people are willing to share, whether that be contacting the vendor or just taking the loss and moving on.

The car was bone stock prior to the heads/cam install, and that was all that was installed.
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Old 04-20-2017, 11:01 AM   #17
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Until the engine is disassembled and the cause of the failure is confirmed, you're just feeding the sharks.

If the valves were reconditioned or replaced by the vendor, then maybe you have a leg to stand on if the failure is from what most people have assumed. However, I'd think a vendor could legitimately claim their only responsibility is to replace the defective head(s). Collateral damage is usually not covered by any warranty.
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Old 04-20-2017, 11:45 AM   #18
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Quote:
Originally Posted by BrandonScott View Post
I have a 2006 C6Z that has about 41k miles on it. About a month ago I decided to order a stage 2 cam and fixed pre-assembled heads cause I've heard too many stories of dropped valves. I let an ASE certified mechanic install the heads/cam/tune. Well the other day I was in 2nd when I felt the RPMs hiccup and instantly fall to 0. I see white smoke coming from behind me. I let the car coast to the side of the road when I see a giant trail of coolant and some oil. I had the car towed to a mechanic here in town who inspected it for me. He says the car dropped a valve which went into the piston and pushed a rod thru the block. I guess my question is, am I just completely out an engine, or does the vendor hold any liability? I understand there's in inherent risk with these sort of things but I have to imagine there was some sort of defect on the supplied heads. Thanks for any input.
Sorry to hear that! I unfortunately had same thing happen to me after I had new heads installed. The vendor didn't refund or compensate me in any way. Hopefully you will have better luck then I did.
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Old 04-20-2017, 12:09 PM   #19
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Quote:
Originally Posted by Tech View Post
Until the engine is disassembled and the cause of the failure is confirmed, you're just feeding the sharks.

If the valves were reconditioned or replaced by the vendor, then maybe you have a leg to stand on if the failure is from what most people have assumed. However, I'd think a vendor could legitimately claim their only responsibility is to replace the defective head(s). Collateral damage is usually not covered by any warranty.
You were correct. I contacted the vendor and was told that I must have over-revved my car and broke a rod which then hit the cylinder head and broke the valve off. I'm 100% positive I didn't but like the vendor said, there is no 100% way to verify which part broke first. I was told at most, if I could prove the head was bad, that they would replace the head and nothing else that it affected and maybe give me a discount on a short block since mine is toast.
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Old 04-20-2017, 12:39 PM   #20
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Quote:
Originally Posted by BrandonScott View Post
So the following specs are for the heads/cam I had installed. Going to try and contact the vendor when they open up in a couple hours.

1.61" Hollow-Stem Exhaust Valve
2.200" Titanium Intake Valve
.660 Spring Kit w/ Titanium retainers
7.800 Chromoly LS7 Pushrods, 3/8 Diameter with 5/16 Ball Ends
Cam- 234/246 .635/.635 (w1.8 rockers) 115+3 LSA

This was all fully assembled prior to arriving to me.
I assume that the issue is with an Intake valve since the one that you are holding is not hollow.
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