14mm 12/4 crossflow cylinder head. Pressure tested and new valve guides have been installed with the valve seats re- cut 1" 9/16 inlet and 1" 7/16 exhaust.The cylinder head is also supplied Riley Register 1" 9/16 inlet and 1" 7/16 exhaust valves.
Heavy little devil at almost 12 kilogram. Could be from anything , title is just a guess . Very good condition. Might be NOS. Combustion chambers look like they still have paint. On the flat side under the centre heart shaped hole is a tiny octagon stamp . ( To faint to get a photo . ) Whats left of the outside colour is military greenish but it l..