before i replaced the chain this time, i'd pull the cam out out and check the cam bearings. shine a flashlight into the cam tunnel and look for wear and make sure the oil feeds are lined up. you could be losing oil pressure to one of the bearings causing the cam to seize.

 

The journal on the cam would be gaulded so bad it wouldnt even be funny if the cam was seizing and if it was it would spin a cam bearing and lose all oil pressure. He needs to look elsewhere IMO.

 

you're most likely right, but with breaking 2 chains most likely because of a bind problem it doesn't hurt to check.

 

95% of the time engines suffering from timing chain failures are caused by defective or improperly installed crank dampers. In your case the failures occured with the factory assembled engine and reinstalled assembly, so I would rule out improper assembly. The likeliness of 2 defective timing chains is extremely remote. A defective crank damper pulley transferes harmonics to the timing chain and is almost always the cause for chain failure. Defective dampers will also cause oil pump pickup failures on the older gen SB Chevys and BB Chevys. Other related symptoms are front and rear crank bolts and converter bolts coming loose and falling out.
Don't spend a lot of time analyzing the front pulley on your engine, just change it when you replace the timing chain and move on.

Good luck.

Richard

 

Thanks guys..........today the FedEx came to my house to drop off my headbolts and the Ls2 timing chain set, but my mom wasan't home so I have to wait to tomorrow.


So Richard, you're saying that it might be that my pulley is a little unbalanced?

 

I couldn't tell which side of the chain was facing what side cuz when I opened the timing cover, the chain was at the back of the cam gear hugging it from behind broken so I just pulled it out.

Guys, you know what the messed up part was? This happened right in front of a guy that I passed by his house and reved at him,.....he must have been laughin his a$$ off my truck . I never do that but this guy does the same thing every time he passes by my house so I went and did the same to him........ain't that a B!t(#.

 

No, it's not a balance issue. It's the pulley's inability to dissipate the torsional (or twisting) energy that runs back and forth along the crank. Replacing the pulley is the only sure way to eliminate the problem from occuring again.

Good luck,

Richard

 

oh well it'll just get stronger now.

 

Hmmm never ever heard of this happening on an LSx engine. When you solve the problem please post what was wrong.

 

You need to pull the cam out. You may have a lifter with a bad wheel. When the lifter starts to wear out the lifter will pit then the cam will wear out and leave a dip in the lift side of the lobe. When the lifter hits the dip the chain gets jerked after a while the chain will break. I have seen this in many gm I4 engines and ford 3000 v6. Mileage doesn't matter it has more to do with metal quality and the hardening process. Good luck!!