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-   -   Yella Terra Rocker Snapped advice on what to do Picture attached (https://www.corvetteforum.com/forums/c6-tech-performance/3271627-yella-terra-rocker-snapped-advice-on-what-to-do-picture-attached.html)

royalmike 05-15-2013 03:03 AM

Yella Terra Rocker Snapped advice on what to do Picture attached
 
Driving my 2007 LS2 vette 23,000 miles quite gently when all of a sudden start hearing loud banging noises :ack: from engine so dip the clutch and pull over get a tow back home.

Now engine has a few mods Lingenfelter: Cold Air Intake, GT11 cam 215/231 .631/.644 118.0 C5R timing chain. LPE Large valve ported heads. 2.055" / 1.57". Yella roller rockers. Manta pushrods. Ported throttlebody and Fast 92mm intake. TB Spacer. 47 lbs. injectors. Kooks 1 3/4 headers with High Flow converters. Lingenfelter: Cold Air Intake, GT11 cam 215/231 .631/.644 118.0 C5R timing chain. LPE Large valve ported heads. 2.055" / 1.57". Yella roller rockers. Manta pushrods. Ported throttlebody and Fast 92mm intake. TB Spacer. 47 lbs injectors. Kooks 1 3/4 headers with High Flow converters.

I was just about to change the dual valve springs which I had just received along with spring compressor and airline fitting to keep valves up and fault this may have been problem as existing had close to 12,000 miles on them.
So removed valve covers and find one rocker snapped in two push rod looks ok on first inspection and can’t see any other stress marks on the other rockers. After a bit of a search round the internet looks like there have been a few failures of these rockers and he manufactures have recently upgraded them.
Link http://ls1tech.com/forums/generation...failure-5.html
So questions
• Is there likley to be any damage to cylinder heads vales from a snapped rocker?
• Best replacement for my car or use these updated Yella rockers.
• I have new double springs and compressor tool to stop valve dropping is it much of a job to change the rockers at the same time, and DIY wright ups.
http://i1082.photobucket.com/albums/...ps8d49e543.jpg
http://i1082.photobucket.com/albums/...psab2d776b.jpg
http://i1082.photobucket.com/albums/...psd0e836a7.jpg
http://i1082.photobucket.com/albums/...psc294f478.jpg
http://i1082.photobucket.com/albums/...ps9d158986.jpg

SK360 05-15-2013 06:57 AM

Honestly I would go back to stock rockers with the trunion bearing upgrade. All brands and models of aluminum rockers have had failures at the pushrod cup. Scorpion revised their rockers many times and each time to new revisions had failures. Not sure about YT.

Stock rockers won't break and have been used in high power builds without issue.

KLLRVET 05-15-2013 07:02 AM

How old are the rocker arms?

royalmike 05-15-2013 10:49 AM

rocker arms installed 2007, still have original rockers with less than 1,000 mikes on them so that is an option if they will work with my high lift cam?
http://i1082.photobucket.com/albums/...ps1960bb17.jpg

SK360 05-15-2013 12:46 PM

Stock rockers worked fine on my .624 lift cam in my GTO.

I wouldn't hesitate to run them

tlove32 05-16-2013 06:30 PM

YT had a batch of older rocker arm failures, and they've replaced them free of charge. I'd get in touch with them

EuroRod 05-18-2013 08:14 AM

Should be no damage issues on the combustion side of the valve. Might pull valley cover and take a quick look to see if anything is amiss in there, but doubtful.
I'd replace the rocker and 'Rock On'.


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