I just wonder if the LS6 spring might have floated and let the valve hit the piston. You might have tight piston to valve clearance, and combined with the high rpm nature of the 4.8L and light springs it may have hit. If so others should show signs.

 

I've seen valves break at the valve steam retainer groove. No ptv clearance issues....

got any pictures of the valve?

 

that sucks man. ive never heard of the valves being junk

 

How does a valve even snap if it doesn't hit the piston? Wouldn't it require some sort of force that's not in the direction of the valve's movement?

 

Let me get this straight.....you are bitching about GMs parts breaking after you installed a cam, springs and other valve train mods? Sounds to me like a valve kissed a piston, a spring took a dump, or the motor was over revved. Either way, I don't think its GM's fault, and it is certainly not their responsibility to replace or repair that under warranty.

 

 

This is seriously making me reconsider using LS6 springs.

 

All in all your slapping a bigger motor in your truck so all's well that ends well!

 

i understood that warranty probably wouldnt cover it, i just needed to rant about it.

i wouldnt have even bitched to start with, until my friend at the dealer told me that he has seen this happen quite a few times on STOCK vehicles with under 100K miles on them.

in my case, i figured some part would fail eventually. just not this soon. it shouldnt be happening on bone stocks vehicle though.

oh well, i have another power plant going in, and everything is alright. i woke up this morning and got out of bed on my own two feet, so it cant be THAT bad right.

life goes on.

 

I've been working at the same Chevy dealer since before the 99' up body style trucks were released and this is the first I've heard of a valve breaking when not attached to a Comp 918. Hopefully your new setup will make you happy enough for forget about your misfortune.