Zuordnung Zylinderkopf....

Auf folgender Seite steht: http://www.austin-rover.co.uk/index.htm?ado15ado50f.htm

The engine capacity was 1071cc and the Downton developed cylinder head (12A185, and later AFG163) featured nimonic valves. The engine also featured a nitrided crankshaft, and all these performance goodies resulted in peak power of 70bhp

und folgendes:
The original 1275S cylinder head (the AFG163) was prone to *****ing between the valves, so the 12G940 employed smaller exhaust valves which cost around 2-3 bhp, although BMC continued to claim 76bhp in their publicity brochures. The 12G940 was an open chamber design like the 12G295 fitted to the 998cc Cooper/MG1100.

Cooper S Kopf?

Grüsse

In Tuning the A-Series Engine steht was dazu:

12A185, AFG163
Brennraumvolumen 21.4 cc
1.4 in Einlassventile
1 5/32 in Auslass

AFG 163
early casting coded "yellow" AFG is later colour coded brown or blue.

Scheint also wirklich ein "S" Kopf zu sein!