Valvetrain + eddy heads ?

My experience is that swapping from 1.5 to 1.6 rockers on the dyno has the motor sound like the cam is bigger.
It’s instanly noticeable.

My one “however” is...... I have never done that rocker test on anything that had a cam so small that it wasn’t kinda lopey already.

Power wise?
For the stuff I’ve tested, the gains are usually quite small.
The instances where the gains were fairly noticeable were combos that were designed to run the higher ratio from the beginning.

I would say at least 50% of the tests I’ve done ended up with no worthwhile gains..... or losses.

The trend for me has been, if the cam is kind of “too small” for the combo, you’ll see a gain.
If the cam is big enough, and fast enough...... gains will be minimal...... or it can actually show less power with the higher RR.

An example of the “no gain” is when AndyF tried 4 different ratios on one of the 470’s with TF heads.
1.5, 1.6, 1.65, 1.7....... all made the same power.