I have a 2001 GT with a Vortec supercharger, bigger injectors, larger fuel pump, full exhaust, and a built ECU. There is a noice comming from the engine, almost sounds like a raddle or a grinding. Could it be the rockers comming loose? Or the lobs on the cam going flat? anybody have a problem like that, or know what could be causing it?

 

http://img688.imageshack.us/img688/76/stngh.jpg

Hopefully this is the solution to your problem

 

It's not a Cobra motor. It's a SOC motor and the noise only happens at the higher rmp's anything above 4,000

 

Probably a hydraulic lash adjuster. Basically like a lifter.

 

I had a noise like that once. Mine ended up being the timing chains were stretched out and loose. There were marks on my timing cover from the chain hitting it. Once I replaced the chains, chain guides, and chain tensioners the noise went away... It was a good time for a PI swap for me, too.