Good/Bad story about heads
04-27-2018, 01:37 PM
#1
Intermediate
Thread Starter
Member Since: Apr 2016
Location: Denver
Posts: 27
Likes: 0
Received 0 Likes
on
0 Posts
Good/Bad story about heads
Hello,
Well here is my story about my heads. 07 zo6 54k. Drop a valve 4 months ago. Got new block, ok new everything from gm. That is its own story, anyway got my new heads from AHP. Still have my originals so these are all theirs. Had a very good shop do the work. Put the heads on drove 5 miles heard loud tick noise, shut it down towed car back to shop, pull valve cover.
.
Not sure if video worked but the valve is wobbling back and forth so the guide came out. Sent heads back to AHP they are saying installers fault. I asked for ms90 guides did not get them and one head is the same, other head with damage is new, I think. They are not reimbursing me any money for labor, piston, hone cylinder( lucky cyclinder wall is ok) and clean motor up with all kinds of metal
, and everything else, oh they did send new gaskets and bolts. I am sure they will be on here arguing there side and AHP is very good at that. Bottom line, head failed, not my fault but it sure feels like it $. Good news car is back together and running for now. Only things is I ran out of money so my car is sitting outside in hold until I pay shop to release it back to me. Can I get a go fund me page 
.
Got the money going to pick it up.
Well here is my story about my heads. 07 zo6 54k. Drop a valve 4 months ago. Got new block, ok new everything from gm. That is its own story, anyway got my new heads from AHP. Still have my originals so these are all theirs. Had a very good shop do the work. Put the heads on drove 5 miles heard loud tick noise, shut it down towed car back to shop, pull valve cover.
Not sure if video worked but the valve is wobbling back and forth so the guide came out. Sent heads back to AHP they are saying installers fault. I asked for ms90 guides did not get them and one head is the same, other head with damage is new, I think. They are not reimbursing me any money for labor, piston, hone cylinder( lucky cyclinder wall is ok) and clean motor up with all kinds of metal
, and everything else, oh they did send new gaskets and bolts. I am sure they will be on here arguing there side and AHP is very good at that. Bottom line, head failed, not my fault but it sure feels like it $. Good news car is back together and running for now. Only things is I ran out of money so my car is sitting outside in hold until I pay shop to release it back to me. Can I get a go fund me page . Got the money going to pick it up.
Popular Reply
05-02-2018, 01:10 AM
Supporting Vendor
Member Since: Sep 2013
Location: Harbor City California
Posts: 2,817
Received 1,012 Likes
on
533 Posts
We fully stood behind our product and sent the customer a replacement head and fully inspected the other head even know our failure analysis eventually lead us to the conclusion that the failure was caused by someone other than us (the failure was caused by driver/tuner/installer).
Our goal is to help the corvette/LS community and to have happy/fully satisfied customers. We do this by providing excellent products backed up by excellent customer service.
It is sad to hear what happened to the OP but the main issue/ignition point here is that the customer/OP wanted us to pay for damage to parts that we never sold him, touched or ever had anything to do with...
We send out 200+ sets of LS7 heads a year all over the world and never have a problem with any of them. We take great time and effort to make sure our product is right before it ever leaves our facility.
In no way are we avoiding this thread or any discussion but we are point blank extremely busy. There are only so many hours in the day and when you sell as many heads and long blocks as we do in combination with a booming install and dyno tuning side my days get very long. Anyone that knows me (or get my 2am emails) knows I put in 16 hour plus days and am one of the most dedicated individuals to my craft that you will find. Even my GM (general manager) puts in 12 hour plus days at our facility.
As stated in our first post if anyone has any questions regarding this feel free to email me/us. We are in no way avoiding any discussion about this or anything else as we have nothing to hide or to avoid. This failure was not caused by a failure on our part but instead on the installation end which was provided by another facility.
We are an open book that is here to help the corvette community. We have been saying this for 5+ years which is evident by our years of 5 star feedback. We are here to help.
Our goal is to help the corvette/LS community and to have happy/fully satisfied customers. We do this by providing excellent products backed up by excellent customer service.
It is sad to hear what happened to the OP but the main issue/ignition point here is that the customer/OP wanted us to pay for damage to parts that we never sold him, touched or ever had anything to do with...
We send out 200+ sets of LS7 heads a year all over the world and never have a problem with any of them. We take great time and effort to make sure our product is right before it ever leaves our facility.
In no way are we avoiding this thread or any discussion but we are point blank extremely busy. There are only so many hours in the day and when you sell as many heads and long blocks as we do in combination with a booming install and dyno tuning side my days get very long. Anyone that knows me (or get my 2am emails) knows I put in 16 hour plus days and am one of the most dedicated individuals to my craft that you will find. Even my GM (general manager) puts in 12 hour plus days at our facility.
As stated in our first post if anyone has any questions regarding this feel free to email me/us. We are in no way avoiding any discussion about this or anything else as we have nothing to hide or to avoid. This failure was not caused by a failure on our part but instead on the installation end which was provided by another facility.
We are an open book that is here to help the corvette community. We have been saying this for 5+ years which is evident by our years of 5 star feedback. We are here to help.
04-27-2018, 02:45 PM
#2
Supporting Vendor
Hello,
As we covered with you in via email and over the phone after we inspected the head and spoke with many of our trusted industry professionals it was determined that a mechanical overrev had occured that cuased the exhaust valve to kiss a piston, slighlty bend the exhaust valve which caused the exhaust valve to go back into the guide, jam in the guide and on the next down stroke of the rocker cracked and pulled the valve guide out of the heads.
This is not a failure of our heads and or valve guides, etc...
This was a failure on the part of who ever was drving or running your engine when the mechanical over rev occurred.
We verified valve guide ID bore size when the head in question was returned to our shop. The portion of the valve guide bore that was not damaged by the guide getting pounded in and out of the guide bore measured within spec which means that the valve guide in question had the correct press making it impossible for it to just fall out of the head as you say. We verified this ourselves and then brought in other industry experts to verify which all confirmed our findings.
This was a failure due to installer/tuner (who ever was revving the engine) and caused a mechanical over rev to occur which bent a valve and caused a failure.
This was not in any way a failure we caused or as a result of any of our work.
If any one has any questions about this please feel free to email me @ HP@americanheritageperformance.com
We will gladly answer any questions anyone has that emails us regarding this matter. Please do email as we do not have alot of time to get on the forum to post reply's or PM's... Email is typically the best form of contact for any questions.
As we covered with you in via email and over the phone after we inspected the head and spoke with many of our trusted industry professionals it was determined that a mechanical overrev had occured that cuased the exhaust valve to kiss a piston, slighlty bend the exhaust valve which caused the exhaust valve to go back into the guide, jam in the guide and on the next down stroke of the rocker cracked and pulled the valve guide out of the heads.
This is not a failure of our heads and or valve guides, etc...
This was a failure on the part of who ever was drving or running your engine when the mechanical over rev occurred.
We verified valve guide ID bore size when the head in question was returned to our shop. The portion of the valve guide bore that was not damaged by the guide getting pounded in and out of the guide bore measured within spec which means that the valve guide in question had the correct press making it impossible for it to just fall out of the head as you say. We verified this ourselves and then brought in other industry experts to verify which all confirmed our findings.
This was a failure due to installer/tuner (who ever was revving the engine) and caused a mechanical over rev to occur which bent a valve and caused a failure.
This was not in any way a failure we caused or as a result of any of our work.
If any one has any questions about this please feel free to email me @ HP@americanheritageperformance.com
We will gladly answer any questions anyone has that emails us regarding this matter. Please do email as we do not have alot of time to get on the forum to post reply's or PM's... Email is typically the best form of contact for any questions.
Last edited by American Heritage 3; 04-27-2018 at 02:47 PM.
04-27-2018, 04:25 PM
#3
Instructor
Just out of curiosity, about what kind of RPM range would you consider to start being a "mechanical over rev?" Is there a fuel cutoff at a certain RPM that would prevent an over-rev?
04-27-2018, 04:31 PM
#4
Racer
04-27-2018, 04:45 PM
#5
a mechanical over rev is when you’re supposed to shift from 3rd to 4th but you miss it and actually shift back to 2nd at a high speed. It mechanically over revs the engine to maximum possibly 8-9k rpms and there is nothing you can do but pray the engine stays together in tact. You can seriously tear up some parts doing that
04-27-2018, 05:22 PM
#6
Drifting
a mechanical over rev is when you’re supposed to shift from 3rd to 4th but you miss it and actually shift back to 2nd at a high speed. It mechanically over revs the engine to maximum possibly 8-9k rpms and there is nothing you can do but pray the engine stays together in tact. You can seriously tear up some parts doing that
04-27-2018, 08:31 PM
#8
Team Owner
a mechanical over rev is when you’re supposed to shift from 3rd to 4th but you miss it and actually shift back to 2nd at a high speed. It mechanically over revs the engine to maximum possibly 8-9k rpms and there is nothing you can do but pray the engine stays together in tact. You can seriously tear up some parts doing that
04-27-2018, 08:45 PM
#9
Too many AHP heads out there (including mine) that have taken some serious abuse with no issues , not saying they can't messa set of heads up but if they spent the time and resources to verify a cause it wasn't like they just said screw you
The following users liked this post:
Brandon619 (04-27-2018)
The following users liked this post:
Blackship (05-17-2023)
04-27-2018, 09:42 PM
#12
so what are you trying to say? It’s ahps fault or just many other reasons could be the reason for it to cause ptvc without a over rev. Not being aggressive just curious. Especially that it lasted 5 miles? Maybe it had to do with the installers fault or maybe the owner got trigger happy when he got his car and was driving home and just missed a shift and knows. But just doesn’t want to say......maybe something fell inside the intake
Last edited by 427V8BB; 04-27-2018 at 09:46 PM.
04-27-2018, 09:43 PM
#13
maybe it was running stupid rich. How do the spark plugs look
04-27-2018, 09:58 PM
#14
Drifting
so what are you trying to say? It’s ahps fault or just many other reasons could be the reason for it to cause ptvc without a over rev. Not being aggressive just curious. Especially that it lasted 5 miles? Maybe it had to do with the installers fault or maybe the owner got trigger happy when he got his car and was driving home and just missed a shift and knows. But just doesn’t want to say......maybe something fell inside the intake
The following 2 users liked this post by 03BlkZ:
Blackship (05-17-2023),
ZeeOhSix597 (07-16-2019)
04-27-2018, 10:04 PM
#15
Drifting
so what are you trying to say? It’s ahps fault or just many other reasons could be the reason for it to cause ptvc without a over rev. Not being aggressive just curious. Especially that it lasted 5 miles? Maybe it had to do with the installers fault or maybe the owner got trigger happy when he got his car and was driving home and just missed a shift and knows. But just doesn’t want to say......maybe something fell inside the intake
Last edited by 03BlkZ; 04-27-2018 at 10:06 PM.
04-27-2018, 10:09 PM
#16
Intermediate
Thread Starter
Member Since: Apr 2016
Location: Denver
Posts: 27
Likes: 0
Received 0 Likes
on
0 Posts
There was no over rev. New motor, nothing over 3500-4000 rpm. Car went 5 miles. Spark plug was full of metal. I think it stopped working. They need to own up to it and reimburse me for all expenses. Whats the warranty?
04-27-2018, 10:11 PM
#17
Team Owner
so what are you trying to say? It’s ahps fault or just many other reasons could be the reason for it to cause ptvc without a over rev. Not being aggressive just curious. Especially that it lasted 5 miles? Maybe it had to do with the installers fault or maybe the owner got trigger happy when he got his car and was driving home and just missed a shift and knows. But just doesn’t want to say......maybe something fell inside the intake
No idea who assembled the motor, and if this "5 miles" was its maiden voyage...but I highly doubt a pressed in valve guide just "fell out" of its bore.
Last edited by MTPZ06; 04-27-2018 at 10:47 PM.
04-27-2018, 10:57 PM
#19
Safety Car
Hello,
As we covered with you in via email and over the phone after we inspected the head and spoke with many of our trusted industry professionals it was determined that a mechanical overrev had occured that cuased the exhaust valve to kiss a piston, slighlty bend the exhaust valve which caused the exhaust valve to go back into the guide, jam in the guide and on the next down stroke of the rocker cracked and pulled the valve guide out of the heads.
This is not a failure of our heads and or valve guides, etc...
This was a failure on the part of who ever was drving or running your engine when the mechanical over rev occurred.
We verified valve guide ID bore size when the head in question was returned to our shop. The portion of the valve guide bore that was not damaged by the guide getting pounded in and out of the guide bore measured within spec which means that the valve guide in question had the correct press making it impossible for it to just fall out of the head as you say. We verified this ourselves and then brought in other industry experts to verify which all confirmed our findings.
This was a failure due to installer/tuner (who ever was revving the engine) and caused a mechanical over rev to occur which bent a valve and caused a failure.
This was not in any way a failure we caused or as a result of any of our work.
If any one has any questions about this please feel free to email me @ HP@americanheritageperformance.com
We will gladly answer any questions anyone has that emails us regarding this matter. Please do email as we do not have alot of time to get on the forum to post reply's or PM's... Email is typically the best form of contact for any questions.
As we covered with you in via email and over the phone after we inspected the head and spoke with many of our trusted industry professionals it was determined that a mechanical overrev had occured that cuased the exhaust valve to kiss a piston, slighlty bend the exhaust valve which caused the exhaust valve to go back into the guide, jam in the guide and on the next down stroke of the rocker cracked and pulled the valve guide out of the heads.
This is not a failure of our heads and or valve guides, etc...
This was a failure on the part of who ever was drving or running your engine when the mechanical over rev occurred.
We verified valve guide ID bore size when the head in question was returned to our shop. The portion of the valve guide bore that was not damaged by the guide getting pounded in and out of the guide bore measured within spec which means that the valve guide in question had the correct press making it impossible for it to just fall out of the head as you say. We verified this ourselves and then brought in other industry experts to verify which all confirmed our findings.
This was a failure due to installer/tuner (who ever was revving the engine) and caused a mechanical over rev to occur which bent a valve and caused a failure.
This was not in any way a failure we caused or as a result of any of our work.
If any one has any questions about this please feel free to email me @ HP@americanheritageperformance.com
We will gladly answer any questions anyone has that emails us regarding this matter. Please do email as we do not have alot of time to get on the forum to post reply's or PM's... Email is typically the best form of contact for any questions.
Or even who they work for. If they even exist at all?
I'd also like to see some pictures of your machine shop, don't recall ever seeing you post any.
Thanks , looking forward to hearing from you.
The following users liked this post:
~STOLEN~ (04-30-2018)
04-28-2018, 07:32 AM
#20
I'm not taking sides with anyone here but with 5 miles on it since rebuild. Most of the time A over rev will bend more than 1 valve from my experience. The guide could have come out the head first. These things are a press fit and if there is not enough interference the guide could come out, The guide had a manufacturing defect or the guide was cracked from installation.