A quick minor correction to my previous post-the ORIGINAL Cox 049 reed valve head was the #302 (up till 1955) and the #302-1 afterwards-(the only difference was the 302-1 had a larger diameter threaded portion) -both with a 'hemi' head profile, the ca 1975 replacement I mentioned earlier was the #325 head, which had a shallow cone profile and was also produced in Texaco (5-fin) and car (1-fin) variants-with different part numbers. My earlier post might not have been quite clear on the distinctions......
ChrisM
'ffkiwi'