SideStep

Has anyone heard of LS7s (with LS7 heads) suffering valve-train failures from mild after-market cams??? (even with upgraded springs)

Haans249

iTrader: (24)

Do you mean the rocker arms failing and spilling their bearings? If so, i've heard it here and there, thats why I upgraded mine with the harland sharp mod.

NEVRLIFT

I haven't heard much. Most of the rocker arms failures I've seen have been on bone stock ones.

Katech_Jason

iTrader: (19)

We have never failed any of our aftermarket combos. They are all tested on the valvetrain dynamics cell for valvetrain control.

OneQuickCoupe

iTrader: (1)

Jason, Do you have stock LS-7 rockers on those combo's.

D.J.

Katech_Jason

iTrader: (19)

Every one.

SideStep

Are these LS7 rockers modified???

Ferocity02

iTrader: (60)

I've heard a few cases of the rockers failing, but it was due to insane spring pressures and improper geometry.

Katech_Jason

iTrader: (19)

Nope. We have never failed a stock rocker in all development, durability, and aftermarket testing.

SideStep

Very good news... thanks for the reply....

See5

iTrader: (53)

There have been TI intake valve failures however.

Louis

iTrader: (7)

And Lashpad failures as well as some valvespring failures, if you make it past the bearing issues that seems to be another engine killer.

bigblockb

iTrader: (4)

I just received my LS7 heads for my build. I was looking at a fairly aggressive cam. I"ve heard about some failures but, not the exact reason. What can I expect and what should I do to try to eliminate any possible issues? Or is it even anything to worry about. Is it something to do with the Ti intake valves?

gun5l1ng3r

Hey Louis,

What/where are lashpads? And which bearings are you refering to? Are these very widespread problems or just freak occurance(although with how few Z06s there are, there shouldn't be any freak occurances...)?

SideStep

I think Lou is referring to the steel caps (lashcaps???) that sit on top of the TI (intake) valve stems to protect them from the rocker... From what I have read this is not an issue on more mildly lifted cams... less than .615ish...

Haans249

iTrader: (24)

I'm running .646/.668 lift on my cam with no issues thus far. I did rebuild my rockers like I said just for extra insurance since I can't afford the R&D of running my cam on a valvetrain dynamics cell

Stang's Bane

iTrader: (22)

I have heard the same problem also. The lash caps wear, then the valve wears and then the valve drops

gun5l1ng3r

Which bearings was he refering too?

RC45

Hmmm.. so the valves are failing on stock heads with high lift cams? Is this fact or just rumour? And what are the lifts inducing these failures? Anyone run .700 lift?

GOaT Cheese

What? I've never seen a lash cap wear to the point of causing a valve to drop. The lash caps are hardened steel,and the valve train noise would be rediculous before anything of the sort could happen.