ok just wondering what you all think. i have heard this same noise once come from my motor. i was watching some videos and i came across this video of a turbo 3.8 camaro and it made the same noise. can anyone tell me what they think it is that made this noise. my motors getting rebuilt but i always wondered what this sound was. here is the video its the run that starts at 25 seconds around 31 seconds he let out of it then it makes that clunk clunk sound from 32-34 seconds. any ideas?