Fitted to early BMC 1500cc engines up to engine number 7201. This early type has a pear shaped water hole.
For later engines see part number JAM1202 Head Gasket
Cylinder head nut torque = 71 lb-ft (9.8 kg-m).
See item 16 in the illustration.
See attached image for the BMC 1.5 cylinder head nut tightening sequence.