Tony, I think standard is 5/8in radius. Although I’ve used 2in radius on race engines, the wear rate is pretty unimpressive and I wouldn’t recommend on road cars. I’d go for standard and 1 1/4 in only. If anyone needs different there are people who will modify them. Worthwhile project though. I’ve just about run out.
Tony/Alan on standard engines 3/4" works it gives an increase in performance without any loss of torque and I have been using 1 1/2" for race engines without any cam wear problems 2"radius does cause wear. Decent s/h followers for reprofiling are getting harder to find. Terry.
I think Charles is correct. Two types will cover most applications and if you want something different then they can always be re-profiled. I had a set re-profiled this summer and I was able to put 8 good ones together. I do have a some good ones left but probably only one set at the most.
Robert is right, 3/8" radius is standard.
I'd suggest to offer these alongside 3/4" radius as a general 'tuning' mod.
People wanting anything more fancy will doubtless grind to their own specs anyway.
Hard to believe these are rare. A few succumb by being split. Any wear is correctable. Originals through hardened and if persons want to modify replacements will need to be the same. If 3/4 rad will bodies be made longer?
