LeftLane Z06

What year(s) Z06 are having issues with blown motors due to dropping a exhaust valve?
Are there any 09 on up with blown motors?

Uncle Meat

LeftLane Z06

Reason being, the 09 on up got a larger oil capacity and wondering if a few internal parts got revised during the change in 09 with the larger oil capacity.

Frans96ss

They all have the problem

HyperX

They all have what problem? Didnt we establish that the problem is less than 2% of all LS7s?

KevinZ51C6

How could you possibly establish that? Less than 10% of ls7 owners are members of this forum.

Turbooo2u

All you have to do is extrapolate out. If 2% of the people on the this forum have an engine problem, then you have to figure that the 2% exists for all owners.

vray

flawgic!

MTIRC6Z

09 and later represent roughly 15% of total LS7 production so there's an 85% lower probably that 09 and later engines will drop a valve. Increased oil capacity might help with oil starvation in high G-load left turn, that's it.

So what other "internal parts" do you think "got revised"?

Cheers, Paul.

HyperX

Corvette Club surveys was another posted method. Out of 100 plus owners, I found 1 with blown engine. This is calling about 8 corvette clubs, exchanging emails with their presidents, etc.

If the issue would be that drastic, do you think GM would keep pumping out LS7s?

Go ahead and call any Corvette club. You will, on average, have 8-12 people that own C6 Z06s. You will then see that none have any issues. Actually most Clubs are not even aware of this supposed issue. You will have people with bad rear ends on C6s - but those were early years. I also found more people having transmission issues on automatics (on regular C6s).

This is not an epidemic.

HyperX

Well, how does Rasmussen do it? I understand that if you see a new member logging on, and posting about the LS7 issue, that members sole purpose is to inform us of the issue. However, lets just eliminate those. Lets look at long term members that joined to just join. Compare how many of those had issues, you will see that number is 1 in 100. If you add in people who join just to inform us of an issue, that number is around 2.5% (roughly 3 people per 150 or so z06 owners).

LS9Drew

You have a real reputable shop on the LSx community, out of curiosity how many LS7s have you had come in blown up and how many roughly have you worked on?

PHXAZ06

Nobody, including GM, knows how many motors have blown.
So, any extrapolation of the frequency is purely conjecture, and supposition. Call your local Corvette Club - that's certainly scientific
I can say one thing with absolute certainty, though, there are a hell of a lot more dropped valves in the LS7 than the LS3, and there's way more LS3's out there.

160KTS

I'm willing to bet if there is 1% of all Corvette owners on CF, that there are at least 2% of all Z owners are here. I say that because the Z is more of an enthusiast car and I am a firm believer that those types spend more time on forums. So even if 2% of all C6Z owners are on this forum, and only 1% of those owners have had a failure (modded or stock) those are pretty solid numbers. We're talking just 1% of a population of 2% have failed.. not even that many. And how many people weren't posters until they blew up? All food for thought. Also remember that the Z owners more than likely are harder on their cars than the owner of a Grand Sport... Also half (ish) of GS are auto there isn't a chance of over-revving.... The sky might be falling, or some people might mis shift. It happens.

JoesC5

Since the Z06 was released, I've known owners of approximately a dozen of them(including me). Not a single failure of their engines occurred while they owned them.

HyperX

If you back this with emotion, and the amount of forum responses to a single failure, it may seem so. But in all, there were like 55 failures on this forum. Out of those, most were modded, tracked, etc. Maybe 20 or so stock LS7s had failure. I have not followed the LS3 or LS2 engines. I have done some LS9 tracking, and I found 4 cases of stock engines with the dropped valve. I know that LS3 also had blown engines, but like I said, I didnt dig into that.

I was in Bowling Green about 3 weeks ago. I talked to some GM engineers, and there is no epidemic. The flying roof issue was an epidemic and there were a lot of people having issues with that. That also included Z06 owners.

One more data point. Resale value. If the LS7 had a widely known issue, the resale value would not be as high. The Z06 has some of the best resale value of any car out there. Keep in mind, when the flying roof issue was publicized, you got phenomenal deals on Z06s (I bought mine for 51k - it was 1 year old with 1600 miles on it). I could turn around and sell it today for 45k. This is a 2008 model. I bought it in 2009.

GMuffley

LS9Drew

By mis shifts do you mean trying to go 2 to 3 or 1 to 2 and hitting the limiter or going say 3 to 2 trying to hit 4th?
Isn't the rev limiter there for a reason incase of a missed upshift

FrankTank

and how do you know that about the LS3?? How many total LS3 Vette owners are registered on this forum..and how do you know there are people that have had an LS3 go down and not report it?

peolple might laugh at him calling Corvette Clubs....but people who are coming to a conclusion about the LS7 based on the small fraction of ownership here on the forum are doing the Same thing

I think it;s also interesting that a lot of these failures, people just by default blame the motor...out of all the failures posted here...not 1 was caused by installation error...do you think a vendor is going to come on and admit they screwed an install and it blew LOL I highly doubt it. .. not one failure was driver mistake, over revved, mis-shift? Not one failure was a faulty aftermarket part?? or a tune?

LSX_NUT

When you shift into 2nd at the top of 3rd gear you experience a mechanical overrev. The rev limiter does not protect you from those. Ask me how I know.