The full engine crankcase number could be DA10, in which case it's from a 1958 Golden Flash.
However, if the alloy head is originally part of the engine, then the case number should be DA10 R and it's from a 1960 Super Rocket.
Steel tube pushrods are standard and very light (A7 push rods weigh 37.9 and 41.9 grams, respectively). Use a magnet to see if yours are aluminum. ...
Thanks Dp
The push rod do not react to a magnet.
A friend dropped by yesterday, and he was sure they're made of duraluminum / duraluminium.
They were probably in bad shape, from the bike running very (too) hard valve-springs (se below)
As the rods are not hardened at the ends I polished them back into shape:
Several attempt were made to make this bike go-faster:
It has the 'Spitfire' cam,
the valves had
extremly strong springs and
the valve spring collars were made of some sort of ligth-weight alloy
(both of which I've replaced with standard items,
as the collars really looked like they could burst any minute.
They were slightly bend out of shape)
The pistons do look like some hi-comp. items.. don't they?
The bike has a few other non-standard go-faster upgrades (andshould I say
brake-faster upgrades:
...Grimeca double-sided double-leading front brakes (four (4) brake actuator-levers (terminology???)
and Ceriani front forks
...Triumph conical hub rear brakes
...Akront rims (the type with the high 'edges')
...Mikuni flat-slide carburettor
So I guess it was put together to go fast.