c4boom

iTrader: (1)

Car has ls7 lifters comp cam 235/239. All 16 lifers and lobes are warn at 30k 1 valve tip pitted. Rockers ar all warn.

RB04Av

Looks kinda like a combination of too much RPM and not enough valve spring.

wannafbody

iTrader: (2)

Probably bouncing off the cam due to springs not damping motion.

c4boom

iTrader: (1)

So what you're saying is that? Comp did an amazing job at specing Springs for it.

RB04Av

I'm not seeing either what springs they specified, what they supplied (both of those are blank on your cam card), what you used, or how they were set up. All I can see is a lifter roller that's got the classic beat to death from valve float. Whatever went wrong, if all 16 are like that, is universal throughout the engine. You do the math.

wannafbody

iTrader: (2)

I've read that with some aggressive cams the lifter can lift off the lobe at peak. Is that enough to damage a lifter, I don't know, maybe someone else would.

RB04Av

Valve float is mostly the valve bouncing off the seat at the moment it's supposed to close. It's INCREDIBLY destructive. It's like taking a hammer to the valve train. Hard to wrap one's brain around, until we realize that the MINIMUM spring pressure exists at ZERO lift; meaning 2 things: just when the valve needs MAXIMUM control, it has MINIMUM pressure; and, carefully setting up springs to get their "maximum" allowed lift, means the MINIMUM spring pressures at all times. It's not so much "valve toss", where the valve doesn't stop at the top of its lift and gets launched off into space, although that can happen sometimes. Again, reason being, that's when the spring pressure is at its MAXIMUM, meaning, at that moment the spring has MAXIMUM control of valve motion.

You can almost NEVER have "too much" valve spring, in the real world. Most especially, seat pressure. Sure, it's "possible", butt hardly ever happens. Almost always, problems of this sort are the result of using the "minimum" "adequate" valve spring, then over-revving the motor, to where the valves are out of control. "Over revving" in this case refers to the valve train, not the short block; that is, it can occur without spinning rod bearings or breaking cranks or whatever. It's about valve train stability. What's in your pic is what I've seen COUNTLESS times over the years, of more RPMs than the valve train is capable of sustaining, caused by inadequate valve springs for the RPM that the motor was forced to run at.

c4boom

iTrader: (1)

I'm not denying the fact that it's probably Springs. Like everyone is saying. I'm just surprised considering you would think they would be able to spec a spring for their own cam.

RB04Av

We still don't know about that. No idea what springs they spec'ed since that part of that cam card is blank.

Furthermore, if their spec gave some upper RPM limit, and the motor regularly exceeded that as it appears, and/or they weren't set up (installed) properly, then... I can't see where that's their fault, or how that's a defense for explaining the damage