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Old 05-15-2013, 04:03 AM   #1
royalmike
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Member Since: Jul 2007
Location: Summerland BC
Default 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 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.
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Old 05-15-2013, 07:57 AM   #2
SK360
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Location: Pittsburgh PA
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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.
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Old 05-15-2013, 08:02 AM   #3
KLLRVET
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How old are the rocker arms?
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Old 05-15-2013, 11:49 AM   #4
royalmike
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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?
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Last edited by royalmike; 05-15-2013 at 11:51 AM.
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Old 05-15-2013, 01:46 PM   #5
SK360
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Stock rockers worked fine on my .624 lift cam in my GTO.

I wouldn't hesitate to run them
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Old 05-16-2013, 07:30 PM   #6
tlove32
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YT had a batch of older rocker arm failures, and they've replaced them free of charge. I'd get in touch with them
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Old 05-18-2013, 09:14 AM   #7
EuroRod
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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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Old 05-18-2013, 09:14 AM
 
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