qndzia

Hi,
I noticed recently that my valvetrain become pretty loud, so I decided to see whats goining on. Under valve cover I saw that almost all guideplates are worn and some of rocker arms are not centered over valve stem, although there is no worn sign on pushrods. Here are pictures (sorry for quality - it's from mobile)
GP1.JPG
GP2.JPG
GP3.JPG

Do I have just bad luck, and should I change these guideplates with other GMPP or should I look for any other possibilities of this situation?

96ta(nick)

Mine did the exact same thing which resulted in a new motor.

qndzia

What do you mean? What exactly had happen?

Kurt Crosbie

Same thing happened to dhirocz. GMPP guideplates must just suck. Is it only happening on the driver's side?

96ta(nick)

The metal from the plates got in my bearings... Spun a bearing and had to rebuild.

qndzia

I've checked only passenger side.. but I suppose the same is on driver's one.

1racerdude

What lifter's ya got? Ya got a small base circle cam? Ya getting enough lube to the Top?How much oil pressure? Your push rods the right length? Rocker shaft's installed with the flat side up? Valve covers hitting rocker's causing a side load?

jsetzer

I think this is very possible in Nick's case...

1racerdude

Could be. Thats some of the things he might check.

stereomandan

Were the GM guideplates installed with the "05" stamped in the guideplate facing up?

Dan

qndzia

Good questions.. Answers below:
- Comp R,
- it's LE2 cam (by Joe O.), lift 0.569
- yes (800 rpm with slow flow from pusrod - didn't check higher rpm's)
- ok
- stock length 7.2" - didn't check but stock lt1 heads with stock GM gasket - so should be fine, i think ..
- I suppose so, although whole job was completed by mechanic
-I don't think so - valve covers were modified


guideplates has around 4k miles.

qndzia

I don't know, but this cannot be issue as far as rockers are well centered - whole material of plate is hardened IMHO.