Thats the head off a Norton Nomad ( or any 600 ?). Has to be late 1950s.
Isn't it identified in Roy Bacons
book as such ?
(Its just reproduced from out of a Norton brochure ?)
He mentions they gained more finning around the front - from 1958 ?
Yup, the 58 brochure has this head, on page x
For a 600, so that would make it part number - xx
So is your manifold pic for a Nomad, for the splayed twin carbs option - it was on fleabay ?
Or aftermarket - the Nomad used a pair of parallel mounted carbs, on stub inlets.
P.S. I've got a late featherbed parts book - somewhere.
Haven't seen it lately, put it on my list of things to find.