One of first 500 of contract C14498 with leg shields
Here's the G&S info; B4 valves, reference for these is V144 Head dia 1.625 stem dia 0.342 and length 5.042 inches. £9.88 ea inlet and exh. same. http://www.gsvalves.co.uk/index.html The V144 is not listed as such in their online catalog, just email, and ask. Cheers, Lex