Hi Trevor,
Thanks for filling in the gaps,
I have only seen the 4 cast lug frames on RGS's on this side of the world
Does your "Big valve" have the battery platform big or small gap?
Steering lock ? or other features??
On the subject of big valve heads I recently got a 1549 head from USA, It is in fantastic condition and as far as I can make out was never removed since it left BSA, the valves have BSA pt numbers and there is no wear on the seats /guides etc.
However it has /had the standard size inlet valves fitted ?? and the intake is 1 and 5/32in.
I fitted another 1549 head to the bike in the workshop (money pit
) that had the A7SS head on,
this one had a 1 and 3/16in. inlet ????
Cheers
John O R