Having run out of any definite information in my files, I have only references to "Standard", I have resorted to Google. I've found a number of forum posts by Phil Beresford who is referred to as "Technical Sales Co-ordinator" At Burlen Fuel Systems.
The earlier link gives more detail. He states that the Standard was 1065, but it is no longer available and is commonly replaced by a 106.
So it seems that at some point, either under Amal or Grosvenor Works who took over from them..or maybe even Burlen, the 1065 was discontinued and only a 106 supplied, for reasons that we don't know...Did it work better ? Could the change even have taken place in the 1950s prior to the Monobloc appearing?
Whatever, although there is no stock listed on the website, it seems that they are in production again.
It's possible that Nortons were used in the 276 testing and that was why the half size ended up as the unmarked standard. The 16H was at the end of the 1930s the most produced model in Britain. Norton were making little else and, like Hawker with the Hurricane, may have been turning out as many units as they could afford prior to the Ministry actually ordering them. Both Amal and Norton were based in Birmingham.
Pursuant to the above Wiki states that Monoblocs use of idle jets meant they just had one standard jet block, and that that was a significant change from pre monoblocs, simplifying production. So it's very possible that a new [or even just later] carb set up for a 106 would not work as well with a 1065. My carb is however a war era one.
