Hello there! Long-time SOHC Honda fan and tinkerer here. I was a member on the old board a number of years ago, and I've rebuilt several mid-70's SOHC 4's over the years.
There's a very good probability that I'll be starting a rebuild on a '76 CB550F Supersport in the not too distant future, so I look forward to dipping into what the board has to offer and swapping tips with all you fine gents.