1.72 Roller Rocker Questions

Not sure how much additional lift the bigger ratio roller rockers give you exactly...but I think my B-303 cam has something like a .494 lift. The 1.72 rollers I installed brought it up to a .512 lift I believe. As far as I know, the bigger rockers will not increase your duration...just the lift. As for what's the difference between 1.7 & 1.72 rockers...I would say next to nothing. The difference would be very minimal being that they are only .02 inches longer. I guess the 1.72 rockers might give you 1-3 thousandths more lift, lol. The increase in lift #s that I listed may be a little off...but I'm sure someone else will chime in with better specifics.