Yes I raised that one a while ago and they have fallen into the trap of charging close to new list for some of their parts. I heard it's the daughter that runs that side of things so maybe its her estimates that are even more optimistic than the old mans.If you want to see some really shocking E-BAY prices , just look at anything that (Norvilmotorcycles) are selling!
The danger is they could buy the bike listed & end up breaking it for 10K plus on their pricing.]
This is a very rare part! Don't you know that? :?Have a look at E- BAY item number 350466973554.from Norvilmotorcycles.
A USED, BARE ,Cylinder Head for a Norton Dommie SS with all the Top Fins Drilled (Lightened)
A snip at £650.