My workshop manual, Sunbeam 260, issue 1964, lists, in the General Data section, the valve head sizes as 1.59 inlet and 1.39 exh. Stem dia is 0.3097 to 0.31. On checking my engine (1964 casting), which I think is original, the valves measure approx 1.68 and 1.45, and 0.344 respectively.
In my Ford Engine rebuild book by Geroge Reid, the head data section shows two sizes of valves for the 260 engine, only those of 62/63 years having small valves as per my WS Manual, but changing to 1.67/1.45 for 1964. Surely all 260 Tigers had the larger valves?
I wonder if any Mk1 Tigers had early spec engines with smaller valves?
Has anyone got a later issue WSM showing updated sizes? Also is the valve stem size in my WSM a mistake?
Is there a list anywhere of any corrections to the WS Manuals which Tiger owners would be well advised to know about?