Dirty Howie

Mark

I certainly am not going to post or not post based on your predetermined intentions of when you decide to cease posting.

Next month I will have been here 10 years and you are the first to ever accuse me of being a troll ……….. thats pretty low

I will repeat what I said before. Get Jason to reopen the thread if thats whats bugging you guys so much !!! If someone is making personal attacks the MODs can delete those posts.


DH

nitrojunky

mostly agree, but disagree on a couple points.

to be clear, and this isn't just my opinion:

considering the low fail rates and few miles driven on the fixed heads, a 100% success rate does NOT indicate that the issue has been fixed. we need data on more heads and over more miles driven before we can begin to make that statement.

that said, i put my money on WCCH and have bet my engine on WCCH and hope it pays off they have a ton of experience and an extremely good reputation, and i definitely don't take their recommendations lightly. but at the same time, as an experimentalist, i need convincing data for proof.

ricky had some questions about what i thought would be necessary to define success. i am very busy with work for the next couple days, but i'll try to come up with a more precise quantitative statement of my conditions sometime this week. but basically for me, if doing a study, statistical significance is what does it for me. we're not there yet.

Vette @ 71

I have contacted several and received varied opinions from Excessive EGT (you know who they were) to poor surface finish on the oem valves.

Non of these suggested failure modes fit's with the facts and evidence.

Any one of these failure modes would represent a generic failure mode for all LS 7's not a few.

Perhaps you do not consider Katech a most respected engine builder.
They say the problem is attributed to badly machined heads. Nothing wrong with the OEM valves.

This is the only likely failure mode to explain the evidence and also supports what GM has gone on record. Yes, perhaps GM got the date wrong on when they caught it or some bad heads were in the supply chain and found their way in later year models.

If anyone is not hearing or pretending to not hear it's you..

'06 Quicksilver Z06

I look forward to seeing what you come up with.

Also, when I get time, I'll do some further research on the modified failures listed.

I recall one striking thing that I found when I initially searched those awhile back, and that was the "cam only" failures.

The "cam only" was almost like the kiss of death.

I found a few other failures of cam setups, using the stock exhaust valves in the heads.

In that subset, the car built like Paul's (MTIRC6Z) that popped, and another owned by scuba_steve stand out.

Both were heads and cam setups, but using the stock exhaust valves.

At any rate let us know what you come up with as you study the actual incidents and the various methods of management of the issue.

Good luck.

MTIRC6Z

Yeah that MTI stageII cammed engine that blew had rocker arms pads which were running off the edge of the valve stem (on the rocker side) as a result of having a greater distance between the rocker pivot and the valve stem center line than my heads do...this sort of knowledge comes from personal touch and NOT from being a simple internet guru

Like I've been saying to some deaf ears, there's a reason why my guides haven't worn out while my buddy's did even though we had the same cam. I have no doubt his will wear out again, but since the first set took over 40,000 miles and a huge amount of track time to blow we wont see the answer for a long time.

Cheers, Paul.

'06 Quicksilver Z06

Do your due diligence on this matter, talk to the cylinder head professionals who actually manage it, do what you need to do to manage it, and you'll get a lot more enjoyment from your vehicle.

In fact, you'll be in "hog heaven."

'06 Quicksilver Z06

Well, that's not very reassuring.

GM getting the "date wrong", and "bad heads" still making it into cars, I mean.

I won't bother asking what you think happened in the "earlier" models. The 2006 and 2007s.

What you say above is concerning enough.

But why is anyone to believe that they got these exhaust valves right, if they screwed up that which you are describing above and in the manner you're describing it?

If they couldn't get the bad heads out of the supply chain, and can't get dates right, then I can't explain why one ought to have confidence in their exhaust valves which have been failing.

I'm going to continue to wait for the next member to post up in the thread for inclusion onto the listing.

As some else already said, those interested in starting another thread or in reopening a prior one, should embark on that endeavor and leave this one.

If you want to offer anything else up in rebuttal to the methods discussed in here to manage this issue, well at this point, I think it better to start your own thread to do it.

And so I'm asking, because I think it's better this way, those who have a problem with this thread, or with me, or this approach to the management of the LS7 valve issue, please leave.

Dirty Howie

Tell you what I will give you a chance to remove your remarks addressed at me. It is unacceptable to refer to me as anyone's GF. FYI, that tatoo is on my son's arm with my initials within the flames. Its his only tattoo and was done out of respect to me. So why don't you remove your insulting reference immediately ............. or are you too PIG HEADED !!!


DH

lbzraptor

Has anyone had experience with running 2 cycle oil in their gas? I have run some in a gasser van and it has over 180k on it with no problems. Wonder if the 2 cycle oil would help to lube the exhaust valves on the LS7 or not.

Dirty Howie

Maybe you should tell me what you meant. I really don't have and didn't have an issue with yours. So I was bewildered as to why you were bringing mine into the fray ...............

Were you makin trouble or just makin beacon ???


DH

VetteNinja69

There are good arguments presented on both sides, after a lot of back and forth in my mind as well as the engine builder I have decided to now go OEM exhaust,beehive springs bronze guides and torquer cam. The cost is not as expensive as a new motor, but its still a substantial amount of money for me to have this work done. In two years I'm thinking of checking the guide wear to see if all is well. Thanks.

MTIRC6Z

Smart man

If your old guides were worn out, feel free to PM me and I'll give you a quick test/measurement to do which will give you a good idea on how much you need to worry about the new guides wearing out too.

Cheers, Paul.

'06 Quicksilver Z06

Good luck with it Nolimit.

Start a thread when the work on it starts up to keep all interested up to date.

At any rate, all the best and at the end of the day, you are the one who has to be comfortable.

VetteNinja69

Thanks for the well wishes. I hope this works for my engine. It's horrible that this issue affects us in the first place. I hope it never causes an injury or something worse. What surprises me is that in an ultra litigious country like ours how a class action lawsuit isn't in the works.

'06 Quicksilver Z06

Class action lawsuits cost money.

zcarbon

Good cause,No / Flappin' ones gums,Yes

MTIRC6Z

Recently a local kid's parents got a recall noticed for his GM product a week after the kid DIED as a result of the item being recalled. GM knew about the problem for EIGHT years before they issued the recall.

I figure GM must have a good hard laugh about all the rich Vette owners complaining about an engine defect which might cost them a few thousand dollars...not exactly a sympathetic defendant, particularly when many are attempting to get GM to subsidise their rich man's hobby

I've only owned my current C6Z since '07 so it still comes as a surprise to me how seriously many Vette owners seem to take themselves. I've been poor enough in my life to see how NOT screwed rich people get and how the opposite doesn't hold true if you are poor...it's all in your perspective

Cheers, Paul.

'06 Quicksilver Z06

We're not talking about saving 15% or more on our car insurance here.

A class action lawsuit, for this matter has been spoken about on this forum, but I very seriously doubt that one will be forthcoming with regard to it.

I believe that one of the more recent threads on this is here.

http://forums.corvetteforum.com/c6-z...post1586562104

ChevyCobb

A lawsuit would only benefit the lawyers anyway

lbzraptor

That's similar to what I did. Little different cam. 10k so far in around a years time. Haven't checked the wear though.