[Z06] AHP Package 4 or Lingenfelter Heads?
03-19-2017, 07:45 PM
#21
Team Owner
I'd rather have my Ferrea F2042p one piece hollow stems versus the OE exhaust valves. Coupled with my PSI 1511 beehive springs w/Ti retainers, my valvtrain is virtually the same weight and is spintron tested to be stable beyond the factory redline.
03-19-2017, 07:53 PM
#22
03-19-2017, 08:04 PM
#23
Le Mans Master
None of the above - simply a personal preference expressed by that individual.
AHP for the win. I had low mileage 2013 heads reworked, I kept the slightly used OEM exhaust valves and that did allow me to trade the savings in on some hand porting.
For the OP, exhaust valves are too old and too many miles, he needs to buy new.
AHP for the win. I had low mileage 2013 heads reworked, I kept the slightly used OEM exhaust valves and that did allow me to trade the savings in on some hand porting.
For the OP, exhaust valves are too old and too many miles, he needs to buy new.
Last edited by Dan_the_C5_Man; 03-19-2017 at 08:59 PM.
03-19-2017, 08:07 PM
#24
Instructor
Running LPE heads with Katech 116 cam. Have had no problems at all. My tuner/engine builder has used them for years. I have seen valve/guide problems from other manufactures not even make it off the dyno after being refurbished. Just sayin.....
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11BtoPA (07-27-2021)
03-19-2017, 08:43 PM
#25
Safety Car
My issue is not with their work, it is the softness of the stock guides which factually do not hold up as well as harder guides. Their heads better then stock because your assured all your guides are in spec.
No reason to choose soft guides when better choices can be had for a better price.
Do you love the 116? I sure do
03-19-2017, 09:43 PM
#26
Instructor
My issue is not with their work, it is the softness of the stock guides which factually do not hold up as well as harder guides. Their heads better then stock because your assured all your guides are in spec.
No reason to choose soft guides when better choices can be had for a better price.
Do you love the 116? I sure do
No reason to choose soft guides when better choices can be had for a better price.
Do you love the 116? I sure do
By the way, I used to live at Lake Tapps prior to moving a little bit south. Just a little trivia....
03-19-2017, 09:57 PM
#27
Instructor
My issue is not with their work, it is the softness of the stock guides which factually do not hold up as well as harder guides. Their heads better then stock because your assured all your guides are in spec.
No reason to choose soft guides when better choices can be had for a better price.
Do you love the 116? I sure do
No reason to choose soft guides when better choices can be had for a better price.
Do you love the 116? I sure do
03-19-2017, 10:16 PM
#28
Safety Car
Elk Grove is pretty close
. I also asked him about changing springs every 20-30 thousand miles.....His comment was "don't worry about it". He has many sets of these heads that have been running for years without problems
While im sure starting with perfect specs, unlike GM did, would make a huge difference. I just wanted more peace of mind with harder guides.
03-19-2017, 10:50 PM
#30
I understand the sensitivity of this post in light of recent (and ironic timing) events with the AHP heads. I would like any recommendations to NOT consider the AHP failure discussed herehttps://www.corvetteforum.com/forums...nds-fishy.html My car will not see similar usage.
Bought my 2008 Z06 last month, came with a 3 month warranty. I am looking to get the heads reworked to prevent the valve drop problem in April or May (before the car comes out of the aftermarket warranty).
The car is stock with 46K miles except for the Corsa Sport axleback. I will not be doing any track days with this car (have my S2000 setup for that). I may install a mild cam in a year or 2, but have not fully committed to it. Car will mainly be used for cruising, some occasional drag racing, and back road aggressive driving.
Couple options I have found: Lingenfelter & American Heritage Performance
Lingenfelter is slightly cheaper at $1250. Uses OEM type valve guides, and reuses the OEM 76g valves. Their shop is within an hour of me, so I can save on shipping by dropping them off myself.
AHP is about $1400 with shipping and uses a custom hardened PM valve guide with the Ferrea 85g valves. Can AHP reuse the OEM valves if they pass inspection and drop a little off the price of the Package 4? If not, what is limiting the reuse of the OEM valves?
What else is recommended to be replaced in the valvetrain or vehicle during this overhaul? Keep in mind I just dropped a chunk of change on this rocket and my wife is not thrilled that I immediately need to through more money on it.
Thanks CF members!
Bought my 2008 Z06 last month, came with a 3 month warranty. I am looking to get the heads reworked to prevent the valve drop problem in April or May (before the car comes out of the aftermarket warranty).
The car is stock with 46K miles except for the Corsa Sport axleback. I will not be doing any track days with this car (have my S2000 setup for that). I may install a mild cam in a year or 2, but have not fully committed to it. Car will mainly be used for cruising, some occasional drag racing, and back road aggressive driving.
Couple options I have found: Lingenfelter & American Heritage Performance
Lingenfelter is slightly cheaper at $1250. Uses OEM type valve guides, and reuses the OEM 76g valves. Their shop is within an hour of me, so I can save on shipping by dropping them off myself.
AHP is about $1400 with shipping and uses a custom hardened PM valve guide with the Ferrea 85g valves. Can AHP reuse the OEM valves if they pass inspection and drop a little off the price of the Package 4? If not, what is limiting the reuse of the OEM valves?
What else is recommended to be replaced in the valvetrain or vehicle during this overhaul? Keep in mind I just dropped a chunk of change on this rocket and my wife is not thrilled that I immediately need to through more money on it.
Thanks CF members!
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REDZED2 (03-20-2017)
03-20-2017, 08:56 AM
#32
The type of alloy used is less important than the quality and accuracy of the machine work. I wouldn't not get too worked up over guide type used. The finish on the valve stem is also very important. Whichever route you choose, I would highly recommend that you have someone verify the work performed (if you do not have the tools or experience to do so yourself). I've been bit too many times to blindly trust the work of others, that I cannot do myself. Reputation does not matter either, as **** happens and everyone has a bad day. I have a set of freshly rebuilt heads on my bench right now that are going back because a mistake was made. If I would not have checked the work, I would have eventually had a very bad day. If you intend to run a larger camshaft, I'd lean toward AI. Those heads consistently make good power.
03-20-2017, 09:22 AM
#33
Race Director
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03-20-2017, 09:50 AM
#34
My opinion, AI heads simply perform better and are proven with an RPM B3 cam/AI heads combo.
As I've stated in other threads, you cant really look at anyone as to resolving the head/guide issue because there's not enough in service to produce any kinda real data.
One or 2 sets of AHP heads have made it to 60k miles with no issues, ok 100's of pairs of stock GM heads have also made it to 100K miles with no issue so to me, the best way to look at this is performance return on your investment/cash. AI/RPM combo produces results, period.
AHP customer service has been great from what I've seen so thats a non issue.
As I've stated in other threads, you cant really look at anyone as to resolving the head/guide issue because there's not enough in service to produce any kinda real data.
One or 2 sets of AHP heads have made it to 60k miles with no issues, ok 100's of pairs of stock GM heads have also made it to 100K miles with no issue so to me, the best way to look at this is performance return on your investment/cash. AI/RPM combo produces results, period.
AHP customer service has been great from what I've seen so thats a non issue.
03-20-2017, 09:50 AM
#35
Team Owner
Performance.
AI consistently make great numbers, time and time again, shop to shop, user to user. They are the most proven high power head out there. Nothing else is close in a stock ported casting. WCCH is 2nd. Consistent proven results. If I'm doing port/performance work, then I want the ones that perform, and AI/WCCH are the two that perform.
If your goal is just to fix the guide issues, I would go with any of them or even a local machine shop. That part is easy. So if the only goal is new guides/etc flip a coin or go with whatever. If your goal is power, AI or WCCH.
AI consistently make great numbers, time and time again, shop to shop, user to user. They are the most proven high power head out there. Nothing else is close in a stock ported casting. WCCH is 2nd. Consistent proven results. If I'm doing port/performance work, then I want the ones that perform, and AI/WCCH are the two that perform.
If your goal is just to fix the guide issues, I would go with any of them or even a local machine shop. That part is easy. So if the only goal is new guides/etc flip a coin or go with whatever. If your goal is power, AI or WCCH.
Last edited by Unreal; 03-20-2017 at 10:13 AM.
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JShort (03-21-2017)
03-20-2017, 11:01 AM
#36
Supporting Vendor
Member Since: Sep 2013
Location: Harbor City California
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I would go with our heads over lpe or wcch. AI does very nice heads but at a higher price point.
We build some of the best LS7 heads money can buy and at a very reasonable price point. We fully stand behind all the products we sell and even offer support if your a do it yourself kind of person. Plus if you want to go with the amazing Moldstar90 valve guides we are the only ones you can get Moldstar90 guides from.
Give us a call and we would be happy to answer any of your questions:
310-326-2399
or if you like email better
HP@americanheritageperformance.com
http://www.americanheritageperformance.com/
We build some of the best LS7 heads money can buy and at a very reasonable price point. We fully stand behind all the products we sell and even offer support if your a do it yourself kind of person. Plus if you want to go with the amazing Moldstar90 valve guides we are the only ones you can get Moldstar90 guides from.
Give us a call and we would be happy to answer any of your questions:
310-326-2399
or if you like email better
HP@americanheritageperformance.com
http://www.americanheritageperformance.com/
Last edited by American Heritage; 03-20-2017 at 11:05 AM.
03-20-2017, 11:09 AM
#37
Safety Car
My issue is not with their work, it is the softness of the stock guides which factually do not hold up as well as harder guides. Their heads better then stock because your assured all your guides are in spec.
No reason to choose soft guides when better choices can be had for a better price.
No reason to choose soft guides when better choices can be had for a better price.
03-20-2017, 11:18 AM
#38
Safety Car
I know it does matter. How much is the question.
Enough for me to want the extra security, and since there are no 60,000 mile examples of these heads you speak of and there are 60,000 mile examples of moldstar guides not showing wear.
We will have to agree to disagree.
Its just like the claims of wcch heads producing more power regularly. Its not a supportable claim. Not only are dyno numbers different, very few before and after numbers are VERE produced on all sides here.
The .030 cut on all their heads may be the only difference here, where AHP gives the customer the choice. I like my .010 milled heads due to the terrible gas here.
03-20-2017, 11:26 AM
#39
Safety Car
I know it does matter. How much is the question.
Enough for me to want the extra security, and since there are no 60,000 mile examples of these heads you speak of and there are 60,000 mile examples of moldstar guides not showing wear.
We will have to agree to disagree.
Its just like the claims of wcch heads producing more power regularly. Its not a supportable claim. Not only are dyno numbers different, very few before and after numbers are VERE produced on all sides here.
The .030 cut on all their heads may be the only difference here, where AHP gives the customer the choice. I like my .010 milled heads due to the terrible gas here.
Enough for me to want the extra security, and since there are no 60,000 mile examples of these heads you speak of and there are 60,000 mile examples of moldstar guides not showing wear.
We will have to agree to disagree.
Its just like the claims of wcch heads producing more power regularly. Its not a supportable claim. Not only are dyno numbers different, very few before and after numbers are VERE produced on all sides here.
The .030 cut on all their heads may be the only difference here, where AHP gives the customer the choice. I like my .010 milled heads due to the terrible gas here.
03-20-2017, 11:26 AM
#40
Racer
