Question for LS7 owners
Thread Starter
Racer
Joined: Jul 2019
Posts: 385
Likes: 196
From: Jersey Shore
I spoke with Dave today and gave him a deposit. You guys did my C5 years ago so I'm completely comfortable with you doing this for me.
Advanced
Joined: Jul 2024
Posts: 63
Likes: 19
there is nothing wrong with re-working the factory heads. the problem is the term "rework" varies from shop to shop and person to person. some think you can just toss in valve guides and call it a day but that is not a proper fix... the factory heads need to be put on a CNC like a Newen, the valve guides will have to be remachined to the correct location and zero runout ensured in order to address the machining issue from GM.
Safety Car
Joined: May 2016
Posts: 4,672
Likes: 1,851
From: Erlanger, Kentucky
I just got off the phone with East Coast Supercharging. Dave over there is extremely knowledgeable and helpful.. The factory heads are not the issue, it's the internals of the heads that can fail. They are going to remove my heads and replace them with freshly machined factory heads with all new internal parts including lifters.
If anyone is interested I will update you as things move forward.
If anyone is interested I will update you as things move forward.
You could remove your stock heads send them to AHP and they would upgrade them and send them back to you. But doing it this way would likely take a few weeks.
I have no doubt that ECS does good work. But I have no confidence that just going back with heads that have stock internals will fix anything. People have done this and then found that the replacement heads are out of spec again and need to be replaced again. Maybe ECS is upgrading the heads to better than stock but that's not what it sounds like to me. Correct me if I am wrong.
Maybe purchase the AHP head package then bring your car to ECS for the head removal and install. I would 100% trust this for my car.
Thread Starter
Racer
Joined: Jul 2019
Posts: 385
Likes: 196
From: Jersey Shore
Seems like you are not understanding. The AHP heads are a factory head that has upgraded internals. What AHP does is provide a factory head with the upgraded internals. You purchase this to replace your existing stock heads with the AHP stock factory heads that have been upgraded. Then you send in your stock heads for a partial refund. AHP then upgrades the heads you sent in and these heads go to the next guy wanting to "fix" their LS7 heads. This process is smart as it would allow you to upgrade your LS7 in a single day and your car not be down for weeks.
You could remove your stock heads send them to AHP and they would upgrade them and send them back to you. But doing it this way would likely take a few weeks.
I have no doubt that ECS does good work. But I have no confidence that just going back with heads that have stock internals will fix anything. People have done this and then found that the replacement heads are out of spec again and need to be replaced again. Maybe ECS is upgrading the heads to better than stock but that's not what it sounds like to me. Correct me if I am wrong.
Maybe purchase the AHP head package then bring your car to ECS for the head removal and install. I would 100% trust this for my car.
You could remove your stock heads send them to AHP and they would upgrade them and send them back to you. But doing it this way would likely take a few weeks.
I have no doubt that ECS does good work. But I have no confidence that just going back with heads that have stock internals will fix anything. People have done this and then found that the replacement heads are out of spec again and need to be replaced again. Maybe ECS is upgrading the heads to better than stock but that's not what it sounds like to me. Correct me if I am wrong.
Maybe purchase the AHP head package then bring your car to ECS for the head removal and install. I would 100% trust this for my car.
Thread Starter
Racer
Joined: Jul 2019
Posts: 385
Likes: 196
From: Jersey Shore
there is nothing wrong with re-working the factory heads. the problem is the term "rework" varies from shop to shop and person to person. some think you can just toss in valve guides and call it a day but that is not a proper fix... the factory heads need to be put on a CNC like a Newen, the valve guides will have to be remachined to the correct location and zero runout ensured in order to address the machining issue from GM.
Supporting Vendor
Joined: Sep 2013
Posts: 3,102
Likes: 1,271
From: Harbor City California
Seems like you are not understanding. The AHP heads are a factory head that has upgraded internals. What AHP does is provide a factory head with the upgraded internals. You purchase this to replace your existing stock heads with the AHP stock factory heads that have been upgraded. Then you send in your stock heads for a partial refund. AHP then upgrades the heads you sent in and these heads go to the next guy wanting to "fix" their LS7 heads. This process is smart as it would allow you to upgrade your LS7 in a single day and your car not be down for weeks.
You could remove your stock heads send them to AHP and they would upgrade them and send them back to you. But doing it this way would likely take a few weeks.
I have no doubt that ECS does good work. But I have no confidence that just going back with heads that have stock internals will fix anything. People have done this and then found that the replacement heads are out of spec again and need to be replaced again. Maybe ECS is upgrading the heads to better than stock but that's not what it sounds like to me. Correct me if I am wrong.
Maybe purchase the AHP head package then bring your car to ECS for the head removal and install. I would 100% trust this for my car.
You could remove your stock heads send them to AHP and they would upgrade them and send them back to you. But doing it this way would likely take a few weeks.
I have no doubt that ECS does good work. But I have no confidence that just going back with heads that have stock internals will fix anything. People have done this and then found that the replacement heads are out of spec again and need to be replaced again. Maybe ECS is upgrading the heads to better than stock but that's not what it sounds like to me. Correct me if I am wrong.
Maybe purchase the AHP head package then bring your car to ECS for the head removal and install. I would 100% trust this for my car.
We have over 3,000 sets of our Package 4 reworked gm casting LS7 heads out there running strong!
Or if you dont want to use GM LS7 heads we have our Archangel heads that are based on aftermarket Brodix castings.
As someone else mentioned above we even have large bore LS3 heads if you wanted to go that route. A few different good options are available
And yeah our rework is not just installing new parts... ALOT of work goes into correcting the LS7 heads which includes new parts/materials, high end top of the line machines & processes along with highly skilled machinists.
Feel free to shoot me a text 310-326-2399
or an email at HP@americanheritageperformance.com
https://americanheritageperformance...._by_popularity
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Supporting Vendor
Joined: Sep 2013
Posts: 3,102
Likes: 1,271
From: Harbor City California
Pleasure doing business with you!
https://americanheritageperformance....cylinder-heads
Drifting
Joined: Feb 2001
Posts: 1,539
Likes: 63
From: new ulm mn
I also had a stock low mile Z06 and considered the AHP heads and decided to go with Katech. Katech not only redid the original heads but I had them install them also. That was a deciding factor as there were no shops I knew of that could do the install and I did not have the time myself. Katech did the original factory LS7 race motors so I assume they know what they are doing. My only regret would be that I maybe should have gone with their Stage 2 plan to add more HP. As it is, I got about another 50 HP. Good luck!
Supporting Vendor
Joined: Sep 2013
Posts: 3,102
Likes: 1,271
From: Harbor City California
I also had a stock low mile Z06 and considered the AHP heads and decided to go with Katech. Katech not only redid the original heads but I had them install them also. That was a deciding factor as there were no shops I knew of that could do the install and I did not have the time myself. Katech did the original factory LS7 race motors so I assume they know what they are doing. My only regret would be that I maybe should have gone with their Stage 2 plan to add more HP. As it is, I got about another 50 HP. Good luck!
Glad you got all squared away 😉
Thread Starter
Racer
Joined: Jul 2019
Posts: 385
Likes: 196
From: Jersey Shore
Well, the car is back together at ECS. They now have to road test it and tune it and make sure everything is as it should be. I should have it back early next week. I'll give an update when I get it back.
Melting Slicks
Joined: Apr 2017
Posts: 2,296
Likes: 386
From: Jersey
ECS pretty much always has LME Heads in stock. They would put them on and send yours out for the next guy. Basicly an exchange, unless you wanted something special.
Thread Starter
Racer
Joined: Jul 2019
Posts: 385
Likes: 196
From: Jersey Shore
Apparently they didn't have any in stock so they had to order them. I'm in no rush so no biggie. Yes, they use LME heads and I'm fine with that.
Melting Slicks
Joined: Apr 2017
Posts: 2,296
Likes: 386
From: Jersey