PwrdbyLS1

iTrader: (5)

I destroyed my H/C LS1 at the track in 4th gear at 5500.. Sound like RRRRRAAAAAAaaaaa.....(smokkeeeeeee) The engine was dynoed at 420rwhp & 410lbs. I know I was beating it everytime I was behind the wheel but I was expecting more than 2k miles on the new H/C setup. Bought the car at 60k miles and dead at 71k... The #5 just disapear! Here's some pictures.
Intake view


#5 side head

other side

I supposed valve have been bent because it were block by somes bottom end pieces
Rod and piston


Someone rebuilding heads said that my heads are good, just need to change bent valves.

What cause this failure ?? piston, cylinder, rod bolts(katech)

So, I need a new engine.. I think about a LQ9 408. I supposed I need a new oil pump, but water pump, lifters, cam are still good I think.

Tell me what do you think! thanks !

aTeam

that sucks, good luck with it

98RedBird

iTrader: (77)

Ouch... well if you're going to do it do it big. Nice work man.

Those heads don't look okay to me. You're going to have to do more than simply swap out the bent valves. That chamber needs to be repaired.

As to what caused it I have no idea. It just let go. You'll need a new engine at this point.

MelScrilla

iTrader: (2)

Damn that hurts. Thats the reason I'm debating putting heads on my high mileage LS1. It seems like in most engine failures the heads end up getting hurt pretty bad.

BTW I dont know to much about head repair but I sure hope you can get it fixed because heads are a big investment.

tribaltalon

who tuned it? looks like your piston blew the hell up. detonation? how was ur af ratio?

hvyhttter

iTrader: (3)

detonation could be it, looks like the motor was taking in some oil from the looks of the combustion chamber

2000Z28AUG

I have a LS1 with 133k and I did my H/C swap at 122k... I run the car hard and recently blew a head gasket due to thermostat sticking and went to check over the motor and it still looks BRAND NEW! No leaks whatsoever. Matter in fact the car runs stronger now. My first questions would to be what parts did you replace on your H/C swap? I replaced all seals and checked piston rings, alongside with pistons and replaced lifters/rods/oil pump. Dude I am so sorry about your loss... But... You'll start great with a fresh beginning and get alot of learning about the motor if you do the install yourself. Take the time and do it yourself and do it right. Good luck!

black00ssFL

iTrader: (24)

What fuel pump? What injectors? What a/f ratio on the tune (verified by log or dyno, not just what the tuner says)? What WB was used? What was max timing wot? Timing at peak tq? Was PTV clearance checked during install?

maxspeed96ct

iTrader: (3)

ouch, good luck man.

conan

iTrader: (5)

Sorry to see. Time for a new forged SB, I would be replacing those heads too. Also if were me I would be a new oil pump, lifters, and timing chain. Hopefully the cam is ok but if you go to a 408 it will be too small.

00Formula00

iTrader: (6)

holy hell, that's a piece of work right there..

StreetSilverado

iTrader: (17)

Welcome to the blown **** club . Looks exaclty like mine, but I slung 3 rods . Time for a bigger and better build, I'm going with the 6.0L bored .030 over (370CI) and a 150shot .

Good luck with your new build

Evans752

iTrader: (29)

I am sorry to see anyone and feel your pain (been there and done that) and hate to see anyone mess there ride up. I see you have 420hp and 410tq so you ahd it on the dyno and I also see in your signiture you have 5.3 heads which if I remember correctly have a smaller compustion chamber which bumps up the compression. The Texas Speed Torquer 2 Cam you have is 232/234 dur 595/598 lift which I think makes the piston closer to valve clearance and I don't see any type of injector in your signiture which I would think you would be super lean especially since you have a 1999 model 26lb injector which should have been maxed out at 400hp or a hair less than that. My guess is you were SUPER, SUPER LEAN and the valve kissed the piston on top of that also. As far as reusing the head goes I wouldn't but thats me. Good Luck getting it fixed and I wish you the best of luck.

02*C5

iTrader: (1)

My condolences I removed my heads before any of that **** happened to me.

9secondsflat

dont worry, drag that hunk in and trade it for the 4500 offered by obama and get a nice smart car...

TooLateVTEC

iTrader: (2)

Thats freakin crazy dude...looks like someone put C4 in that hole and blew it the F up.

Good luck on the new build.

Jason 98 TA

iTrader: (4)

Youch that's some pretty healthy damage there. Sorry to hear your having bad luck! Is only 1 head destroyed? We can probably work you out a pretty good deal on a replacement just to get your heads back together. If you need a short-block give us a call, we'll help any way we can! It always sucks to see a stock short-block die! Makes me feel bad for the one in my engine dyno bay with over 200 pulls on it!!

allngn_c5

iTrader: (3)

Sorry to hear about the carnage man. At least now you got a good reason to go bigger, and lq9 408 sounds like a nice path to take !! Good luck.

PwrdbyLS1

iTrader: (5)

The heads need to be desassemble, clean, changing bent valve, removed and removed burrs in the chamber and mill the head. This is what the head builder said to me.

The car have been tune by a local tuner on a dyno, a/f was 13.5 because the wide band was after the cat. The tuner said you can tune 1 point leaner when the wide band is after the cat. The timing was conservatory because I run on 91oct here in canada. Sorry I didn't write I have 42lbs Lucas injectors on stock fuel pump. PTV clearance wasn't check on the installation because many people on the board done this combo without problem.

When I bought the car had detonation problem with the Diablo tune, I dont know how long the last owner run it on detonation but maybe the piston was a little bit weak.

I still dont know if I change the heads for L92 heads for my LQ9 with a L76 intake.