C6Z Rocker arms and mileage question

[seamus2154]

I have an o8 Z and have read about the roller bearing failures on the rockers still happening. Has anyone installed the Harland sharp rockers on the ls7 as cheap insurance. I plan on keeping this one and don't want to keep looking for the problem. I'm pretty hard on the Z and expect trouble. How hard was the install after the removal of everything of course? Second question is related--- Are there any high mileage LS7 C6Z owners w/ a report of other issues that are arising. How are these babies holding up long term regarding the motor? So far everyone I speak to w/ this LS7 has less than 10,000 mls on it. Thanks guys

[extanker]

33k no issues

[seamus2154]

Thanks for the reply. No one has installed the Harland Sharp rockers on the LS7 and no one has high mileage or info on the LS7????

[extanker]

i would be worried if ya had problems with anything else in the motor and the dealer opens it up and finds the aftermarket rockers.we have 100000 quarentee

[seamus2154]

That's a good point. I was really considering it if it comes up. The thought of one of those video jockeys opening up my motor send chills down my spine! And from what i hear there is no NEW rocker arm for the fix. Also they fix them one by one as they fail from what I hear. Imagine them opening your moter several times for a known condition and putting in the same low quality weak point part! I still can't believe this is how they handle this. They know most owners are not putting big miles on these cars and are waiting out the 5 years. It's a cost saving issue for them. Just venting, I still don't know why every car in my garage is a GM car, knowing what I know of this corporation! That's why I asked of anyone w/ high miles on the LS7.

[extanker]

ive 32k on my 07z and bounced off the rev limiter more times than i can tell ya.i dont worry about the rockers besides is the one they replace an improved one? some have caught it [no pun] when they change the oil ,they find a needle bearing. i worry more about snapping an axle stub when drag racing

[08 Z06]

Found 4 needle bearing on 1st oil change....dealer replacing with Harland Sharp in 30days...none in stock for 08's...30 day waite

[seamus2154]

Who's buying the Harland Sharps you or the dealer? And why is there a wait on 08 rockers if this isn't a common problem?

[No Doubt]

All C6 Z06 ('06-'08) rocker arms are the same as far as I know. This issue does not affect only the LS7 and has been reported as far back as 1997 with the introduction of the C5. It also affects other GM engines besides those used in the Corvette.

As you can see below, I had one fail in my '07 Z06.

Although the Harland Sharp rockers appear to be a better design, one should assume their use could potentially result in warranty issues if something else were to occur. For example, if a valve spring were to break causing a valve to drop resulting in an engine failure, and aftermarket rocker arms were discovered.*

Note: although all of the reported rocker arm failures below were with '07 vehicles (out of the 8,149 produced) it does not preclude '06 and '08 cars.

James E...... - 2007 Z06 - built JAN 07 - ______ @ 3450 (one rocker starting to fail, engine built 1/7/07)
KGjevre...... - 2007 Z06 - built JAN 07 - intake @ 3797 (cyl #7 & #8, stock, 1st oil change, engine built 1/22/07)
jan eric..... - 2007 Z06 - built JAN 07 - ______ @ ____
tigerwho..... - 2007 Z06 - built JAN 07 - ______ @ 4800 (all rockers with excessive play)
Pistol Champ. - 2007 Z06 - built JAN 07 - ______ @ 5000
Av8terZ06.... - 2007 Z06 - built JAN 07 - intake @ 2846 (cyl #8)
ronin8181.... - 2007 Z06 - built FEB 07 - ______ @ 3226 (dealer found no broken rocker arm...)
Pkw333....... - 2007 Z06 - built FEB 07 - ______ @ ____ (other forum)
Tamulinas2... - 2007 Z06 - built FEB 07 - intake @ 3266 (cyl #8, deliv. MAR so est. FEB build)
Cloaked...... - 2007 Z06 - built MAR 07 - intake @ ____ (cyl #2)
No Doubt..... - 2007 Z06 - built MAR 07 - intake @ 5400 (cyl #7, engine built 2/21/07)
Bigbucks..... - 2007 Z06 - built MAR 07 - intake @ ____ (one failed, one about to fail, car buit 3/15/07)
jbp8653...... - 2007 Z06 - built MAR 07 - in&exh @ 9900 (intake failed, exhaust about to fail)
greendot..... - 2007 RFZ - built MAR 07 - ______ @ 5800
Ken Olson.... - 2007 Z06 - built MAR 07 - ______ @ 6000 (dealer replaced 3 rocker arms)
90sundevil... - 2007 Z06 - built MAR 07 - ______ @ 6500 (5th one with same issue at this dealer)
ryuz06....... - 2007 Z06 - built MAY 07 - intake @ 12000 (stock, 2nd oil change)
Patsfan67.... - 2007 Z06 - built JUN 07 - ______ @ ____
NavyVet...... - 2007 Z06 - built JUN 07 - intake @ 2500 (cyl #5 & #6)
Beast350..... - 2007 Z06 - built JUN 07 - intake @ 8000

AtomicZ...... - 2007 Z06 - built ______ - ______ @ ____
NOSZ06....... - 2007 Z06 - built ______ - intake @ 3000 (cyl #6)
RichieRichZ06 - 2007 RFZ - built ______ - ______ @ ____ (customer's/"her" car)
roadking se.. - 2007 Z06 - built ______ - ______ @ 3000 (sold)
silver93vert. - 2007 Z06 - built ______ - ______ @ ____ (boss' car)
Z06Norway.... - 2007 Z06 - built ______ - ______ @ ____ (cyl #8)

Total=26


* Although it would be incumbent upon GM to show said aftermarket rocker arms led to the failure of the valve spring in the above example scenario, it's a battle an owner may have a difficult time winning.

[seamus2154]

[b]Thanks, I wonder what the real#s are. I agree if you change out the rockers trying to avoid this and then have a related problem, could be a nightmare. I don't want to throw a 100,000 ml warranty out the window, it was part of the reason I made the purchase.

[08 Z06]

Originally Posted by seamus2154

Who's buying the Harland Sharps you or the dealer? And why is there a wait on 08 rockers if this isn't a common problem?

The dealer is replacing the OEM rockers with OEM rockers for now...then will order Harland Sharp rockers for me and replace them for the cost of the rockers. $400+ ...My suggestion, he checked with a race engine builder on brand of rocker that was best.... I will continue to check for foreign objects on drain plugs