I found an Action Fours 4-1 in a yard in Phoenix. This old guy Stan used to race flat track going back to the 1960s and had a yard full of bikes in various states, maybe 30 or 40, with a few inside (with his dogs, who 5hi7 and pi55ed all through his house). I bought a few things from him over the years, 350 tank, CL175 for the exhaust, then got what was left running with other exhaust, etc. But the exhaust caught my eye and I pulled it off the bike without knowing what it was, but intrigued by how the headers collected way in front instead of below. Sold it here IIRC. Once I knew what it was -- and the Action Fours made cams -- I wanted to go back and open up that engine but I moved to Mexico and that was pretty much that. Saw Stan one more time -- didn't answer his phone so I rang his bell, and he came out buck naked and disoriented. Looked at his old bikes, looked for something in the yard, and talked to him about buying one of the 550s he had in the house, but he wanted something like $2k for it, and turn signals and side covers were broken, tank was dented up, etc. Tried to reason with him, but he told me his brother had come over and they looked at things on the internet and he wanted what he thought they were worth. Last time I saw him, and it was 8 years ago. Don't think he was long for this earth. Tried calling him once or twice, but he never picked up, and thought about going back every time I was in PHX but never got to it. Engine might've had that cam, but I'm guessing everything was scrapped if he's no longer with us -- or his brother tried to sell his stuff.