99 WS-7

I have a noise that comes and goes. Sometimes when I hit high rpms It sounds like a baseball card stuck in a bicycle wheel. It also sort of sounds like marbles shaking in a can sometimes, alomost like a bolt is loose in the exhaust system. At first I thought that something was something contacting the drive belts or fans, but nothing is close. It does it somethimes when I rev up the motor while stopped as well. I recently had a new LS6 382 stroker installed with Hooker LT's with the ORP. I also did the AIR restrictor mod. It's not detonation because I was logging runs with a scanner at the time. No Knock was recorded. Can anyone help?? Thanks

SmaknaSS

iTrader: (1)

Anyone?

99 WS-7

A better way to describe it, is loose change in a washing maching bouncing around.

Silver WS6

I wonder if it is detonation? I read the other day detonation sounds like someone let a bag of marbles loose in your engine.

Venkman

iTrader: (4)

do you hear it at lower rpms...like around 2000-2500?

SmaknaSS

iTrader: (1)

I have a rattle sound at high RPM's too(5500RPM) with no regesterd detonation with EFILive scanner, My rattling sound comes from the front not the rear. I'm thinking It might either be valve train noise or the air pump valve loose on I'ts metal braket.