Hi Robert,
I have just checked my heads, one has the 9E mark with 3 core plugs of which one is between plug 3 & 4 I have been unable to read the patent number without taking the paint off.
The other one does not have the 9E mark but has AF, it also has the same core plug configuration, this might be an Ulster Head ? again the patent number is not readable.
The basic combustion chamber shape is the same on both heads ( one has been slightly modified though )
I can see no sign of a patent number on your head.
Its an odd one !
I believe that the head design was moved on from the Ulster to the Type 65 then Nippy and Speedy so it highly likely that more than one foundry pattern was made. ( Blown and Unblown Ulster ? )
I also suspect that the markings were nailed to the wooden foundry pattern and not changed at each casting.
This seems to indicated at least three different foundry patterns by sampling the three different heads so far.
It will be interesting to see what other details arise from you question.
I have two 9E blocks, one marked CHROMIDIUM the other one without.
Another Mystery of the Sports parts !!?
I have just checked my heads, one has the 9E mark with 3 core plugs of which one is between plug 3 & 4 I have been unable to read the patent number without taking the paint off.
The other one does not have the 9E mark but has AF, it also has the same core plug configuration, this might be an Ulster Head ? again the patent number is not readable.
The basic combustion chamber shape is the same on both heads ( one has been slightly modified though )
I can see no sign of a patent number on your head.
Its an odd one !
I believe that the head design was moved on from the Ulster to the Type 65 then Nippy and Speedy so it highly likely that more than one foundry pattern was made. ( Blown and Unblown Ulster ? )
I also suspect that the markings were nailed to the wooden foundry pattern and not changed at each casting.
This seems to indicated at least three different foundry patterns by sampling the three different heads so far.
It will be interesting to see what other details arise from you question.
I have two 9E blocks, one marked CHROMIDIUM the other one without.
Another Mystery of the Sports parts !!?