Has anyone done it? I thought I remember these shafts being hardened. A friend is trying to decide what direction to go with his valvetrain and looking for options as you cant buy cranes in a complete set for SB, at least as of right now...

I have been running Probe rockers on 273 shafts for 4 years now. The shafts do have banana grooves. Just a flat tappet cam with around 530 lift running on a dirt track. 7200RPM. I am sure aftermarket shafts would be better, but so far we have not had any problems. Bob P.

Good to know...Thanks!