Weight blocks

[colclio]

I have found two cast iron blocks bolted on to the right side of the engine bay (car is RHD). One is bolted underneath the right top engine support and the other is seen between wheel well and engine (have pictures but can't find a way to upload them). I presume this are weights to compensate for driver.
Can they safely be removed? What is the easiest way to remove them?

 

[colclio]

I guess no one knows what I am talking about. Here are the pictures in case they might help.
http://www.flickr.com/photos/25287521@N05/2405890310/
http://www.flickr.com/photos/25287521@N05/2405890446/

 

[bmh.01]

They're part of the engine mounts afaik, leave them be.

 

[sideways danny]

they're noise/vibration damping ballast blocks. not noticed the one in pic 1 before and can't really see it properly, but the one in pic 2 can be removed safely

 

[colclio]

Weird I could only find it on one side of the engine and I can't seem to find any reference to them in the manuals I have. Can no. 2 be removed with front bumper in place? Would vibration/sound increase considerably?