Rocker arms

[muscl car]

Coil bind can cause rocker arm failure like you experienced also to long of a push rod can do the same

 

[JordanZ28]

Several things come to mind, it could be an oiling issue. Was there any squeaking noise before this rocker broke? Does the ball or socket look like it's seen high temperatures? Post a picture looking down the center of the rocker, where it mounts on the stud. Do this on the broke ones and a couple still on the car.

Due to blown head gasket , I change the oil pump for a new one because the orginal has some grinding , the push rod still the orginal one piece, I did not run the engine yet but my plan to put together in the next few weeks, I will take e a picture as soon as I got home .
Thank again

 

[JordanZ28]

Coil bind can cause rocker arm failure like you experienced also to long of a push rod can do the same

As far as ak kow still the one piece push rod which I think the orginal. I will research for the coil binding and check mine , just to let you know the roker arm still the orginal one. So maybe due to milage,

 

[krabben1]

Could be some foreign piece inside the spring,could be the pushrod centers are clogged preventing oil from passing thru......have to inspect it all.

 

[CorkyE]

I can't see coil bind with a stock camshaft. While a possibility, something foreign getting into two springs and breaking the rockers is out there.

 

[Fwyflier]

One thing to think about if you decide to which to roller rockers. 1 the push rods actually seat to the rocker so it is recommended to replace the push rods. 2 when replacing the rockers it is also recommended to check the alignment on the top of the valve where the rocker rides. It should be centered there. If it is not you will need to adjust the length of the push rod to get it centered. Thus they make an adjustable push rod so this can be done. If you’re using the original drive train chances are no need for this however I would inspect all you rockers to see if there is lack of oil type damage. If so, might be time to replace all.

 

[sandlapper]

Neither do I --- but Does it have a stock cam? (I haven't noticed JordanZ28 mention cam)
Or has some "expert" shimmed the holy heck out of the springs ?
Or has some "expert" tightened the valve lash Way Too Much ?
Start at the beginning and begin measuring.

another suggestion: choose a single discrete valve and when valve is at MAX lift-Fully open, measure ALL the gaps between that spring's coils --- COMBINED TOTAL of those GAPS should TOTAL a Minimum of 0.060"
(make those measurements on AT LEAST one intake and exhaust from EACH of BOTH cylinder banks.)

I can't see coil bind with a stock camshaft. While a possibility, something foreign getting into two springs and breaking the rockers is out there.

 

[krabben1]

I think this is the 2nd one this year which broke of from the center , I found one with coil pin ingrraved to it. What you recommend to start looking for?

Do you have half round metal pads under your adjuster nuts?

 

[HOGDADDY]

Roller rockers are not worth it alone for HP gains.