Hey guys- trying to understand the impact of switching from 1.5 stamped steel rockers to 1.65 rollers. Besides the friction benefit, I thought I understood it that the bigger rocker had the effect of mimicking the lift of a bigger cam due to some geometry that I don’t understand. I found this page- Wallace Racing - Pontiac Factory Cam Specs I have the 540233 cam from a 1962 389 SD. This shows the change in lift by moving to 1.65. Is it that simple? Just drop them on? Any issues with valve to piston clearance? Appreciate the insights. Thanks...