1badassZ

Dropped a valve and sent the piston threw the other side. Popped around 6000RPMS in 2nd. Motor had a cam and headers at the time.





Luckily when it happened I was on the way to Quality Motorsports and was able to coast to within a block of the shop.

Replacement:
-Forged Lingenfelter 427
-WCCH heads
-Quality Motorsports Mamba cam



I was making around 550 with the Black widow cam and I'm now making 555 with 10:1 compression.

KLRBEE2

Sorry to hear brother; however, it was a great excuse for an upgrade! I'm assuming that the 555 is not with the new block, heads and cam...is it?

MTIRC6Z

Exhaust valve? And if so, was it stock?

Who did the tune?

Cheers, Paul.

sublime1996525

Damn man sorry to hear that. Should be a fun upgrade though

GMuffley

Ouch.

Larry Gonzalez

I'm sorry to hear about your motor I hate seeing these things happen, how many miles with the cam?

Turbooo2u

2005 big body

want to know the same.

Dirty Howie

Valve guides out of spec ??

Good luck with new engine


DH

Random84

Maybe the sky is falling.

Cheesecake 07

+1. Man thats ugly

MGP1

Ouch!

Rock36

Just curious why are you going with a lower compression ratio this time around?

z0sicktanner

The same thing is happening with stock motors...they are dropping valves...iit's got to be in the heads...to many failures. and I find it hard to believe that these shops don't know the root cause modded or not...I've had hotrods for 25 years and never dropped a valve untill my z....glad I'm out of mine

OnPoint

Good luck with the new mill.

Mopar Jimmy

Turbooo2u

I'm thinking of getting out of mine. Maybe a GS with the reliable LS3 engine.

1badassZ

Yes, 555 is with the new block heads and the smaller cam.

Yes, exhaust valve and the valve was stock.

roughly 8000 miles

Not sure what caused the failure


My plan is to slap a maggie on it next year.

FrankTank

And like I posted in your thread, I find it very hard to believe that out of all the failures we see, especially on modded motors, that none were caused by a faulty aftermarket part, install error, tune or abuse from the owner. Every single one was a "faulty" LS7

The stock ones, I'll give you, that is concerning to see, but pull out the modded and tuned cars like yours, AND this one in this thread that had a cam for 8,000 miles, and the % of failures is very small.

Look at the other thread of the guy who got 24,000 track miles out of his car until the motor blew, his engine was stock. Richie Rich Z06 same thing and countless others.

Bottom line, the motor was designed and engineered and tuned a certain way from the factory... you go out of that realm and you play at your own risk. I know you learned that lesson the hard way.


To the OP, very sorry to hear about your motor. What kind of springs where you running with that cam? You don't know what caused the valve to fail ? Just curious.

dcsteg

If I wanted more horse power from this engine I would leave in intact as it came from the factory and up grade with a super charger.

I like the Callaway SC 652 and as far as I know there are no issues with this set up. At least the last time I talked with Callaway there wasn't.

BS to all those mods that blow up in your face. To many hands in the pie to insure this thing will fail at some point. Sooner then later.