Maxrr

I just wanted to thank this forum for all the "heads" up regarding dropped valves/wiggle test/valve guide wear. I took my '09 with 19,000 easy (mostly) miles to the dealership to have the wiggle test performed and the guides were out of spec to the extreme. The service manager seemed surprised they were so bad and was glad I brought it in when I did, even though he was skeptical at first and made sure I understood I'd be responsible for the $600 labor charge if they were in spec.

The heads were replaced under the GMPP warranty and Classic Chevrolet made everything pretty painless. I know I'll likely still have to have the heads reworked, but at least this starts me back at zero...

Thanks to the recommendations on this forum, I drove 3 hours to make sure Classic was the dealership to work on my car.

Don't listen to the naysayers, get your heads checked and/or fixed!

-Max-

Dirty Howie

Was your motor making unusual sounds or consuming oil??


DH

RegnaR

nice, did you get complete heads?

Too-Fast

NHRA95

Maxrr

The car was not making any strange noises nor consuming oil, but it did feel like it had lost a little power.

All the shop said was that my heads were being replaced; not sure about complete vs non-complete...

rockinSeat

Pay to have the new heads measured before you put them on. They could be out of spec as bad as the old ones. Check concentricity.

mxking

I recently changed oil myself on my 07 z06 (has been changed twice at dealership). I found metal shavings and like metal grit on magnets. I also found some more grit in old oil when i stuck a large magnet in it.
Reading this thread is there a recall of any sort about this. On another thread someone told me that it is normal to have these pieces on magnet upto about 15k miles. My Z has 8k miles on it and has never seen over 6k rpm. (rarely that, T just wanted to have a 427 )
Thanks Mike

2k Cobra

Very good advice! One of our members got a new complete set and some parts were out of spec. He paid to have the New GM heads fixed.

Maxrr

Here's the receipt showing the measurements and the repair that was performed...

Gary '09 C6

^ but can you confirm whether or not the clearances on the new GM heads were measured before installation ?
If not, this factor is still an unknown. Good all was replaced under warranty nonetheless...

WICKEDFRC

A "Good news" story is always good, especially given the reputation of the LS7 Valves.

Glad you were taken care of the the right way.

ATC399

Makes since 08-11 Z had/have this issue...

mxking

So ist this normal for a 07 z to have metal on drain magnet until it has around 15k miles on it. ( thats what another forum member said )

Mark2009

This does not sound normal. You need to send that oil off to a lab like Blackstone and have it analyzed.

I would refrain from driving the car until you get that report.

The metal 'paste' on the magnet is normal. Shavings probably are not normal. Grit in the oil is not normal.