YOOFORMULA

iTrader: (6)

Any ideas what could cause this? Hotcam with 918's and hardened pushrods. I dont know when it happened, but I drove probably 30k miles on that cam. There were only 2 valves that looked like the one on the left.

M6HuggerSS

maybe valve float? did the piston hit the valve?

YOOFORMULA

iTrader: (6)

There wasnt even so much as a nick in the piston or the valve when I cleaned them all up so I have no clue.

CaptUSA

iTrader: (5)

That's really weird. Glad you're okay though. Could have been much worse.

Juiced

iTrader: (2)

that could have been real bad

Juiced

iTrader: (2)

glad to see that your still running

kenkaru

i wonder if that could that happed if the seal was not installed all of way, allowing the spring seat to bounce around?

marc_w

Besides the seals(?), I'm not quite sure what I'm looking at...

EDIT: I get it now. Possible valve float hammering down on the seal...

Another_User

When you changed your springs, did you use the new spring seats?

marc_w

Didn't crank down too hard with the spring tool, right?

DaddySS

I assume you're talking about the mushroomed seal? Probably compressed the spring too much during the install.

Classic

iTrader: (3)

Did you put 30K miles on a single set of 918s or have you changed them out?

CaptUSA

iTrader: (5)

Even if he had 30k on those 918's, they should have been just fine on a hotcam. TR's had 918's go over 60k with no issues.

YOOFORMULA

iTrader: (6)

Sorry about the confusion, but the springs only had about 10-15k max. The cam and the rest of the valvetrain had about 30k on em. The guides were fine when the springs were installed and I never went past stock rev limiter so I have no clue. Oh well, got some duals in there now with LS6 valves so now if I could just get the damm clutch fixed again, I might be able to drive it...

PREDATOR-Z

You know LS6 valves are a bit longuer right?

SAPPER

iTrader: (10)

^^^^^^^ This is one of my votes, but also having 15+ yrs working cyl heads, I have seen where the valve guides aren't the same height. as little as .050 can cause this. I always cut the top of my guides down .100" just to be safe and the PC seal still has clearance at the bottom and I make sure they are all the same height from the spring seat.

YOOFORMULA

iTrader: (6)

Yeah, I figured that one out about 10 miles after the install and compensated with shorter pushrods.