help id this head

[glaser 31]

anyone know what bikes this head is made to fit 

[rogerwilko]

Try again a bit smaller with different angles please.

[chaterlea25]

Hi glaser 31 ,
Evan with the tiny photo it looks very like the head on this engine
What diamater is the combustion chamber?,
does it have twin exhaust ports? carb inlet diamater?
Do you have any more of the engine? cylinder etc??

Regards
John O R

[rogerwilko]

Bingo John!!

[glaser 31]

 
hi John,
it looks like the one you have ...
I will get the diameter later today,yes it has twin port.
I dont know how musch more I have fore this engine

[glaser 31]

diamater 3 1/2 "

[chaterlea25]

Hi again, glaser 31
If the combustion chamber is 3 1/2 in diamater or is that the spigot diamater where the lip on the top of the cylinder fits in?
Its more than likely a 500cc engine, a 350 would have a bore size of 71mm (2 and 3/4in. app) and a spigot size about of 80mm  (3 and 3/16in. app)
The head is from a Blackburne engine and this design came in from 1928 onwards engine type UT
Can you confirm the sizes I asked for in this and the previous message, this will tie it down better
The same design was used for 350 and 500 engines so photos are only so good
Regards
John O R

[glaser 31]

hi John,
here you can see where I took measurement on the head.the intake is around 27mm.

[chaterlea25]

Hi Glaser31,
I would think(nearly sure!!) its from a 500cc model

John O R

[glaser 31]

 
thanks John,
now I will see if I have more parts fore this engine
regards Glaser