Hello!
I would say there isn't such an animal.....During the last 15 years that I have been the Swedish distributor of MVVS engines no gold head MVVS beside the .40 "Q-500" engine that was launched 2 years ago has been produced. The .45 (7,5cc) engine was first made with a polished aluminum head, then a red anodized head and now a blue head.
Are you sure that it isn't a .40 "Q-500" engine you have?? Or a .45 with a "Q-500" head?
Could you show us some pictures please!
Regards!
Jan K
Sweden