Hi all this is a question for people who may know more than me.

Has the head on the new go engines been completely re-designed or is it more of a 'cosmetic' change?

The reason i ask is that the head on my 'silver top' version the cooling fins are breaking away from the central tower, the four lower fins on the head closest to the bottom (below the body). The same has also happened to my friends cooling head on his go engine.

Both of these engines were purchased in australia, i emailed mark at massive mods but did not get a reply.