The LS7 Valve Guide Issue Is 100% VERY REAL!!! (How to remove and check your LS7 heads)
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- Опубліковано 28 сер 2024
- Get your heads checked and "fixed" ladies and gentlemen. I really wanted to prove this myth wrong but sadly, no. Even my heads fell victim this notorious guide wear. Luckily, none of my valves dropped and cause a catastrophic failure but boy was it on its way.
From additional research Ive done, it looks like the cause of the excessive wear of the guides is from a poor machining of the valve guide bores relative to the valve seat. Any competent machine shop with experience dealing with the heads should know how to permanently remedy the issue. Just installing new guides is only a bandaid. The guide bores themselves need inspection and remedy.
After seeing your video I believe GM should have paid to redo these heads, that is an engineering flaw.
I understand that the factory didn't machine the valve seat cutouts to be concentric with the valve guide bores, thus causing the valve seat inserts and the valve guide guides to also not be concentric. Apparently, this would cause side loads on the valve stems with consequent excessive wear of the guides.
Can the guide bores and valve seat cutouts be remachined so that they are concentric before installing new seats and guides? Otherwise, just replacing the guides would put you back to square one with this problem and reset the clock on this engine destroying itself.
Great video and great info brother. Good luck with the process. I promise it’ll be all worth it when she’s all together and back up and running!
You know your stuff man, I wish I was brave enough to do this to mine
Yolo bro
Awesome video man, this is a great build series, keep the videos coming
Eric Loya thanks man, filming this week!
@@daniel1997gsx why not just buy better aftermarket heads where they dont suffer from the same manufacturing defects.
Gm pretty much ended sae it late 80's. Why you keep saying its standard and not metric? Its metric. Lugnuts some might say sae but they are metric. If need be check corvette forums. Wiggle test is done with the springs off using dial indicator. Its what a mechanic would use. Valve seated in head is when you wiggle not halfway out. LS life????
Was also planning to get a c6 z06 Le Mans edition blue
Found one with the heads done and cam and really wanted to buy, till heard about the heads still having the issue after having them worked done :/ don’t really have the money for big maintenance issues within 5 years if I were to own. In the process of finding a 6th gen SS with magna ride unfortunately but will for sure love the camaro once I cop :D
Thanks for the video, can't wait to see it back together..i plan on doing this myself if i buy a ls7, very helpful video
Thanks mate, cars been back together for about 3 months now. Just gotta upload my videos now
You MUST run the lash caps man. It's because the valves are titanium and the rockers are steel. They would wear rapidly and fail without them. The ONLY way to not run them is if you swap to a steel valve...but then you're sacrificing RPM. LS7 life bro...get used to it.
I know you do, I was just debating if I was going to reuse my old ones on the engine or buying new ones. I ended up reuses my old ones on the new fixed heads
Nice, I’m glad you did a video on this. Waiting for next video!
I think he must have muffed the rebuild and had to send it out to a shop for the rebuild .... 4 months now and just excuses on the completion video.
Thanks for posting your experience. 57k on mine and getting nervous after seeing all these things out of spec. I’m thinking I’ll be doing mine this summer. Probably do the cam as well. How many hours did it take you to get to this point? If you had to do it again, would you, or would you pay someone to do it?
Yeah man definitely get them done sooner than later. It took my about 10 hours it get to this point. I took my time and would have done a few things different but overall pretty easy job. I would do it again if I had to
Thanks! Sadly if you use the car much it sounds like you'll get the opportunity to do them again... I keep hearing even reworked heads don't last either. I was talking with a guy that works these heads, he said he's never seen a set of reworked heads make it past 15k miles without being out of spec again! Fu@k, this issue really pisses me off!!! I really wish there was a perm fix, other than switching to LS3 heads and intake (with a significant power loss...
SS OFFSHORE yeah... I go into detail about that subject in my next video, but I don’t plan on touching these heads again until my bottom end needs to be reworked
Yeah my 09 had many out of spec valves but one exhaust valve that was 3x the serviceable limit of looseness at 23k mikes. Kohle at AHP said it was as bad as he’d seen back then in 2015 he said like throwing a hot dog down a hallway.
SS OFFSHORE yeah, I might skip the C6 Zo6 and go to a c6 Zr1 instead
Great video! I have my heads, but have to install them soon.
Is it necessary to remove the lifter trays if not messing with cam? or maybe just to inspect them? Brave on those fenders:).
i noticed you said to rotate the motor to relieve tension off valve spring to remove rockers. What about reinstalling them when its all fixed? Do the rockers just bolt back on after dropping in the push rods or do you have to rotate motor again to make it bolt up correctly?
TheBudgetTuner, it seems that you did a terrific job of cleaning the surface of the block before installing the new heads. Would you mind describing the process you used?
Brake cleaner, wd40, straight edge
I would have loved to see the play from the stem side
I somehow missed how you found top dead center.
Wicked helpful video. Thanks 👍
My local performance shop that’s suppose to be the best in my area uses Reconditioned LS7 Cylinder Heads for the swap. Have you heard of that? Is that different than getting say AHP heads or Texas speed or is that what They all do too?
If you were beating on this car before you took it apart, more than likely for sure drop a valve. Ufff good thing none of that happened
TheBudgetTuner, thanks for making this video. I plan on doing my heads soon as well. I was wondering if it was necessary to remove the exhaust manifolds. Can't you just unbolt them from the head and leave them hang?
Yeah you can, I just removed them for more room
So which shop did you end up going with to redo your heads?
Nice video btw!
ron mor next video will answer all your questions 🤟🏻
Everything on that engine is in metric also. GM pretty much went all metric over 20 years ago!
Freedom Units!
What year is your Z06?
2009
TheBudgetTuner how come this recall wasn’t fixed?
Hi, bud, does the LS7 require lash caps on the rockers and if so on which rocker do you install the lash caps on? All the rockers or just the intake side or exhaust side???????
Intake only
TheBudgetTuner thanks buddy, but boss I bought a ZO6 that had a blown engine and antifreeze came out of the oil lines and drain plug aswell and a piece of metal came out! 😂 do you know what it might of been?
Is it a hardness issue of the valves guides ?
Did you have to deal with any exhaust leaks or other problems after these mods ?
Nope
no fender covers
Bro I just bought a 06 Z06 and it’s bone stock and I’m using my car as a daily and man I’m so nervous every time I drive it. I can’t wait for the money in a couple months to get the heads fixed. Did you notice any signs?
No signs whatsoever, I’d wouldn’t beat on the car until you get the heads fixed. Literally ticking time bombs 🙃
TheBudgetTuner btw when you gonna get the build video up here man you are keeping us waiting and I would love to see the finished product, can keep teasing us fam. I’m going to send my heads to AHP and I am betting you did too.
Orpheuss haha car has been done for about a month now. I’ve just been to lazy to edit, but videos coming very soon!
2006 ZO6 Corvette did not have the issue supposedly it start in 2008 through a vendor
@@richardcerritelli9657 All the z06 ls7's have the issue, none of them are safe
Im kinda confused, i worked on a motor one time and the guides were kinda loose ua-cam.com/video/11eXlFkZekM/v-deo.html and it must have been that way longer than a long time because i had it for a long and it was like that long before i got it. It was one of those L eight eight motors and even though the guides were a little loose it run fine. Bad guides break the valve?How can that happen?
What year is your car and was it modified?
2008 and nope, all stock
I might have missed it, how many miles on the car?
car made it to 80k like this
Great content! New subscriber at almost 3k subscribers and I’ll be here at 300k
bro your mic is too close to your mouth, can literally hear every little lip smack and swallow and nasty noise you make
How much cost to fix heads ?
1500-2000
Stock clutch?
yupe
Dam near watched all your videos 😂about to cam heads cam intake pulley injectors dsx pump headers. Ls stuff isn’t to bad tho
Updates?
lol just made a post on this channel IG about updates. Just got back from vacation, got a ton of footage i need to edit. Videos coming soon!
just had my ls7 heads replaced by vengeance racing
How much did you paid for the job?
@@CarlosMorales-lz9wc it was around 9200 but it was because I had them to put a bigger cam in it and headers and a x pipe
@@TheRockmart scammed
@@stunna_CODM ong bros wallet got milked😂😂😂
@@TheRockmart shoulda payed at least 6.5k
Waiting for next video 😭😢
Haha today!!!! I promise
5 months later
uploading right nowwwwwww lol
I Have 1⁰0146 On My Z06 Daily Drive r Prodic 4 06 Date
Don’t beat on your corvette, it might fall apart. 😂 no wonder a bunch of old dudes and old ladies own them, they don’t drive them the way they should be driven.
Speak for yourself, man. I'm 65 years old, and when I wanna run it, I leave the wife home and see how much rubber it lays from 40-65mph in 2nd gear.
Guy is a little boring but at the end he shows the actual valve guide ware. 80k mile motor