I don't know what the actual physics are. I do know that I've chased rocker arm ratio on the dyno several times. It costs a ton of money to do and the results are iffy at best. I think it cost me more than $5000 last time I chased rocker arm ratios. Rocker arms cost close to $1000 per set these days with shipping and hardware. So if you round up four sets and then pay for the dyno time to run all the tests you can easily burn thru $5K. Last time I did that I found zero power. I'm not in a hurry to do it again.