Just a casting number rather than a part number.Nothing on the underside Speckydude. On the topside left there is the Leyland logo with HR1230 and the topside right RMIS
Have you looked inside the manifold to see what you have ?Seems my options are:
ETC5330 2.5L PETROL PARALLEL SIDED BORE MANIFOLD.
ERC9071 2.5L 4 CYL L/R PETROL CONICAL END DOWN BORE MANIFOLD