rattling noise

[ArjanRS]

Hello,

Since i replaced the rocker cover gasket, the engine/exhaust makes a rattling sound when revvin up.
The gasket is good, and i don't think it's de dephaser too?

We also jacked the engine up (for cambelt change), so maybe the exhaust gasket is leaking?

In free: Revving up slowly doens't make it rattle, but giving it a hard rev it does.
On the road: Rattles when i give some gas for acceleration, but at a steady speed you don't hear it!

What could be the problem?

 

[ArjanRS]

Anyone? ;D

 

[ArjanRS]

At cold (first 500 meter or so) is doesn't make any noise when revving up.
After that, it does

 

[ArjanRS]

Since i can't edit or change the main post, here's a vid from the sound!
http://www.youtube.com/watch?v=heY0BSSnG8M&feature=youtu.be

Sometimes you can't hear it very well, but i think at 0:40 you can hear it the best!