I send a message to Blue, which is the editor of the well know UK mag 100% BIKER . she kindly send me few other pics of the entire bike and some info about that .
it was built
by a guy called Richard Tunstall. Front barrel and head from a 1340 Shovel with
BSA M21 crankcases and M20 crank and connecting rod. Because the pushrods are
now parallel, the rocker cover, pushrod tubes, tappet blocks and cam followers
all had to be machined and he reprofiled some BSA Gold Star scrambles cams to
replace the M21 cams.Thanks a lot for that Blue, it's an interesting concept to follow