396375

Did you diagnose the problem?What broke.Was it a rod,rod bolt ,piston etc...
Just wondering what is the weakest link in the bottom end.
Thanks.

BLOWNBLUEZ06

Rod bolts and #7 piston seem to be the weakest. Most typical to break the ring land on #7

Drewstein

Snapped a rod.

0Rob@ChampionMotors

All depends on application. H/C high RPM change rod bolts/rods and if your going this far you may as well change the pistons. For FI up to 550-600 rwhp you need to run a really safe A/F ratio and timing as the piston ring lands can't take any rattling.

HP_Addict

ring glands on #5 and #7 got me

01Tim

ring land #5 got me 2 times 1stock 1forged

Toby Van Horn

I bought one forged, but the prev owner cooked the factory block, not sure what happened.

Shinobi'sZ

It's called Hyperuetetic Alloy Pistons. The silica content makes them very brittle and the ring lands tend to snap like a cracker if you get any detonation....no room for errors with them at all.
About 7 years ago I found this out. It's really easy to tell when the pistons break...if the dipstick doesn't pop up and spray oil all over the place..you can do a compression test and the cylinders that come up 70-100 psi lower then the rest....are toast. I broke 4 piston ring lands.

For a bent rod I have only heard on at the track...it was knocking really loud.

Chris.Shea

All started with #7. most likely piston failed first and managed to take everything else with it.

VetteFish

ringland 5 and 7. cracked pistons. didn't "blow", but it was time for a forged bottom end and a new tuner!

Fastbird

Didn't shred the bottom end, but tore the valvetrain apart. Cam gear ripped out of the camshaft, PTV contact on ALL ehxaust valves, bent six exhaust valves to the point of being stuck open. Number 7 was a little loose in the cylinder upon teardown but that's it.

BLOWNBLUEZ06

Is that anything like a sweat or saliva gland??

396375

I'm surprized no one has had a broken rod bolt or main cap even though sometimes it's hard to tell what went first.

Shinobi'sZ

I think earlier LS1's had some rod bolt failures until after the C5R effort exposed the weakness...trying to remember but I think there were some rod bolt factory fixes around the 2000 model year. But there has been people on here in the earlier days that experienced rod bolt failures.

madmatt9471

For me it was the #7 piston ring that went!

I started to have excessive crank pressure/blowby and at times would blow the valve cover gasket out and then finally it blew out the ring

here's a couple of pics:





Thanks,Matt

Z06PSI

All piston ring lands for me... I'm not kidding.

Z06wanted

number 1 for me.

0EPP

Breaking the number 7 ring land is indeed the most common. Bob

0EG@EnglandGreen

Melted #7 & #5.

greekc6

im workin on it. prob post pics on the site sometime this year