vvlf

The stock ones work fine <- I would just use those

I believe the Comp kit works for all LS motors

Cman01

Looks like there is still a difference of opinion on whether to use the comp bolts or stock ones. I guess I will wait till my rockers are back on with the trunnions installed and see the difference in bolt length before deciding which to use.

Another question to those that have done the upgrade. Did you take the parts out of the plastic packages and install or did you clean them up a bit and oil them slightly with engine oil before install??

CanadaGrant

Cleaned the trunions prior to assembly and then stored the rockers in a tin of engine oil until I was ready to install in the car. I used the supplied bolts after measuring each hole to make sure they wouldn't bottom out. I used compressed air to clean any oil from the bottom of the holes and did not use thread locker as it is not recommended in the service manual.

Cman01

ok thanks, and did you also do any kind of cleaning on the caged brgs. or just install as is after cleaning the trunnions?

CanadaGrant

Bearings were clean but the trunions were coated with heavy sticky preservative type oil and were dirty.

vvlf

Keep in mind this is a universal LS trunion upgrade kit, its not specific to just our LS motors. Its not as though the bolts are supplied because the stock ones will no longer suffice in our particular scenario. My opinion is why change / fix it if theres nothing wrong with it. But to each their own

Just took them out of the package and installed. Nothing wrong with allowing the prepacked grease to do its job

ANGRY Z

Comp cams trunnion upgrade kit ordered.

Maligator

Im sorry, im lazy to read through all 41 pages; aside from addressing the bearing issue, will this kit help the sewing machine type noise?

John_P

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Maligator:

The "Comp Cam" Trunion Kit took away almost any and all of that "sewing machine type" noise that has been described in this thread on my 2007 Z06. However,... let me add that my car did not have as much "valve train noise" as some of the other CF members have described.

I think that CF member vvlf also said the kit quieted his engine considerably too.

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John_P

Maligator

thats excellent. I know vvlf said it was amazing how the noise was subdued, but I wasnt sure if he was specifically speaking of the sewing machine type noise..................definitely mod number 2!!!!!!

John_P

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Maligator:

Yes, the "Comp Cam" Trunion Upgrade is by far the BEST mod I have done on my 2007 Z06! I am sure CF Member vvlf will come in here and give you some more input. He and others helped me ALOT here on this forum with this particular issue on our Z06's and I am darn glad I became a member here. Being fairly new I look to the knowledge and experience of so many of these members and it has sure paid off!

Please let us know how the mod works on your Z06!

Bud Meyer

Just finished installation on a 2008 Z. Build date 06/07. 22,500 miles. All the rocker bearings looked good. I Re-used the orignal cap screws. I have read post that say do not use lock-tite. I'm telling you that I think the factory used some type of lock tite as I fractured a Craftsmen 8mm socket removing the rockers. Avoiod using a 12 point socket 1/4 or 3/8 drive, it doesn't matter...they can round the heads off the orignal caps screws during removal. Did note that the outboard bearing cage on the Comp (pt #outboard only) bearing appeared to look as if it was slightly thicker material that the stock cage. The only reason I went with the #13702-KIT was my machine was in the built during the date of some units with valve failure due to rocker arm trunion bearing failure. I enjoy all the post and love to put the hammer down....

Cman01

I see some red lock-tite material on my bolts too but I'll reinstall without it and keep an eye on things. If I have to pull the covers to retorque I might do the lock tite thing. Might be hard though since the bolt holes get oil in them and you need a clean area for the lock tite to really work. If it's torqued to specs it should stay there.

No problem getting my stock bolts off with the 8mm socket. Tried to do it with my regular 3/8 drive ratchet wouldn't budge. Went to the johnson bar and it cracked them all loose very easily. Loved the "ting" sound that you hear when the bolts cracked loose.

Might be a good idea to try that tape lock-tite sells now????

Cman01

My install was just completed, the thread:

http://forums.corvetteforum.com/c6-z...has-begun.html

Cheesecake 07

Just did my CHE's this week...re-used stock bolts. Checked them 250mi later after 5-6 heat cycles and all were still torqued.

cosmer

Hi guys,

I am looking at purchasing a 2007 Z06 with 2200 miles that was built in October of 2006. Is it possible that this vehicle will have the rocker arm bearing issues also? I could not find any information on the site that talked about the problem on 2007 cars built before January 1, 2007.

Any help would be really appreciated,

Gary

John_P

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Gary:

Welcome to the website Sir!

Gary, the majority of the LS-7 rocker arm problems seem to be on the early built 2007 Z06's. But, with that being said, all of the LS-7's have the basic same designed rocker arms with the lousy set-up on the needle bearings as has been well covered in this thread. In fact, if I am not mistaken, I think all of the LS engines have this same basic design. Some of the more veteran CF Members will correct me on this if I am wrong.

If you are seriously thinking of buying that 2007 you are looking at, i would suggest running the GM Maintenance History on the car along with a CarFax. If GM did any work on that engine, it will usually show on the GM History.

Hope that helps you some Sir.

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John_P

KGjevre

From my recollection it seems like the range as indicated in the 2nd post in this thread still is the time frame where there was an increased failure rate of the rocker arms, which is build date of January 2007 to about July 2007, so the car you are looking at should be outside of that range.
However, even outside of the higher failure rate time frame there can be still be failures, but regardless, I would not let that stop me from buying the car.

Like John_P says, have the Chevy service department run the history on the car. If it is a private party sale, you may have to get the current owner to do it as sometimes the service department will not do it unless you own the car.
In the past there have been some people on this form that have had access to run the history, and when I was looking for mine I got it done that way on some cars, but ended up buying a new one instead. Don't know if anyone is still doing it.

If you are really paranoid about the issue, have the valve covers pulled and check the rocker arms.

gbruner

It happened to my 2007 Z06, with draining the pan, cost was 900.00. Replace 1 rocker.

Eddie1941

I know this is a old forum but I just know found it, my Z06 was built 11/06 but it just has 6200 miles on it, has anyone had problems with their rocker arms around this date. The dealer has not said anything about any problems with my car but I am going to have the oil changed tomorrow and tell them to check the drain plug .