The1N_only

iTrader: (7)

Me and my wife went to get some dinner this evening and on our way home I heard a familiar ticking sound. I pulled the valve cover when I got home and found a rocker arm broke. This makes 2 broken Intake rockers and 1 cracked exhaust rocker.

Is anyone else having bad luck with these rockers?

The Dragon

iTrader: (6)

That's why I never installed my set years ago.

I purchased a set 4 years ago and sold them a few months later after reading a bunch of horror stories.

Tainted

iTrader: (9)

Are you sure your valvetrain geometry is correct?

JMBLOWNWS6

iTrader: (17)

I have beat the crap out of mine and no issues. Man that is weird I agree with post above to check for proper wipe and geometry. I did have to shim mine inorder for it to be correct. If I wouldnt have it would have put it in a bind and a failure would be inevitable.

KCS

iTrader: (20)

You may want to check for coilbind.

FryZ71

No probs. w/ my YTs...been in the car for almost 5 years.

SideStep

Which Yella Terra are these... the first series? or the newer revised version?

dr_whigham

iTrader: (49)

Scorpions are sounding better and better. Granted, they initially had issues to, but those have supposedly been resolved.

MikeFSKSpeed

iTrader: (37)

Go with the Scorpions and dont look back!

built408

iTrader: (10)

what cam and springs?

The1N_only

iTrader: (7)

Cam is a custom grind Solid roller Cam motion 257/266 .649/629 112 on a set of Morel tie bar lifters. The rockers are shimmed to correct the geometry and get the wipe pattern where I wanted it. I'm running PAC-1521, We shimmed the springs are well but i cant remember off the top of my head what the seat pressure and open pressure ended up at. Ill have to pull the build sheet I did up on the heads. The springs are no where close to coil bind nor am I running into valve float.

To be honest with you, it appears that the rockers reached their fatigue rate and sheered.

DietCoke

iTrader: (18)

You're brave to run those rockers on a solid roller. Fatigue on the AL and eventually they let go. With no oil cushion like a hyd it isnt surprising.

The1N_only

iTrader: (7)

They are Hyd lifters.

CamaroZ28_LS1

iTrader: (5)

so you have a hydraulic roller cam then?

The1N_only

iTrader: (7)

Negative, It is custom Cam Motion ground on some of their milder soild roller lobes. FYI they are about on par with Comps LSL just a little more aggressive off the seat.

BlackBird87

iTrader: (6)

my buddy had a problem with one of his. the roller got pinched on two of his. He got new ones but dealing with yella terra is a nightmare. good luck with the problem though

The1N_only

iTrader: (7)

I've talked to a few people now and from what i've gathered they had a bad batch of rockers. These where purchased back in Late 09 when I had my LS2 H/C set up. I put 1300 miles on them before upgrading to the big motor.

The1N_only

iTrader: (7)

FYI you can not run a solid set up on a non adjustable rocker... There would be no way to adjust lash

driver56

I have the adjustable version of that rocker on a solid roller with just over 600lbs open pressure and no issues yet.

DietCoke

iTrader: (18)

You'd be surprised some of the **** people do on here.



Or maybe you wouldn't.