Well that's no arguement !!!

"Duration" is ALWAYS measured and stated in DEGREES.
Duration is always measured at the cam (to avoid any confusion due to rocker ratio !!!).


0.050"x1.067=0.053"
I don't see degrees here, all I see is lift.

Those who argue that duration changes are measuring lift at the valve. Of course it will change there, due to the different ratio the valve will have .050" of lift sooner and later in the cycle BUT the actual duration from the time the valve starts to open and finally closes WILL NOT CHANGE based on the different ratio of rocker. Regardless of ratio, the pushrod, rocker and valve only start to move when the lifter is put in motion by the cam. You will see more lift through the entire cycle but if the cam spec says it has 284 degrees (total) of duration, no rocker on the planet is gonna change that.