Can anyone explain how to do this or have pictures of this? I’m putting in a solid roller and was told that I should banana groove my shafts to deal with the added spring pressures.

67 Barracuda street car, 408, e85, 1.38 60', 6.44 @105.9 in the 1/8 mile, 10.19 @130.5 in the 1/4...so far....