You're going to be exasperated! The picture has passed through various unknown hands and some that are no longer with us. Like all these things, if I'd known about it ten or twenty years ago it would have been easy - but then it wouldn't be mysterious!
All I can tell you is that its original owner was involved with motor racing in the fifties - which I think we could all have guessed. The only other piece of information that seems consistent is that the head was made by Derrington. I was hoping that might just ring a bell with someone.
I've tried to confine myself to fact but it does strike me that, as soon as Climax produced a twin cam, any market for the head in the photo would evaporate - but that's just my idea, not fact.
Regards, Stuart
Edited by stuartu, 23 May 2014 - 08:14.