Explain this.

If the cam you have is a .500 lift at the valve, the. To find out the new lift, divide the lift (.500) by the rocker ratio of 1.5 and the multiple it by the new ratio of 1.6. The math looks like this.

.500 / 1.5 x 1.6 = new lift.
.500 / 1.5 = .3333333 x 1.6 = .533333333

You valve springs should be changed out for the new valve lift if they are not capable of the new lift.

In addition, the quicker lift intensify's the cam's duration by approx. 2*'s @ .050.

Is it worth the change? In the way you described?

Well, a lot depends on what your doing and what your engine combo is. On the whole I'd say no. But it is a worthy upgrade when you are looking to race. That would be for the aluminum rocker in either ratio. Having the valve open accurately to the full potential lift is a lot better than the sloppy OE rocker stamping.

No, you won't feel it and would be hard pressed to see it on the E.T. slip.