proform rockers ?

hi, you can modify the 273 rockers your self!!!! run a tap through it. then grind a flat spot on rocker arm. I did mine years ago, being careful you can do a good job on them, its not rocket science!!! I run 345 # pressure, 7400 rpm in traps. those rockers have been in use about 20 years now.. you do need to have grooved shafts like 273 came with.