Peter - Many of Bill's 4-cam articles appeared in the 356 Club of Southern California magazine. Bill may have been a contributor to the Registry magazine also in years past, but I'm not aware.
There is a reference to the 356 Club aricles in this forum from about 4-5 years ago.
http://www.abcgt.com/forum/5-4-Cam-Foru ... ranks.htmlI did try a google search and found quite a few posts on Hirth cranks in the Registry Forums, but none by Bill
forum.porsche356registry.org "Hirth"
The 356 Registry magazine is not searchable by a word search, as such, since the old copies are saved as pictures of the pages and not as text. At least I'm not skilled enough to do it =8^)
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Here is the cover of a 356 Club mag from 2012 - not sure if that is a Hirth roller crank or not, but a good place to start.
You may be inquiring about the Hirth crank made in the 50's for the pushrod motors - that is a different animal.