Dear Bert;
No there not. I looked into this in depth, in 2003 for one I was building.
The cams for those (216/235/261) are ground with this in mind and acording to the "top guy" @ Howards 'not to worry'.
Now; There's a guy in S. America that's making gears for the later 250/292 which are adjustable.
Does anyone know if 250 gears will work on a 261??
