My fingers get oily when I an adjusting preload. I adjust the slack out of the valve train then turn it on quarter turn. I have run mine as loose as 1/8 turn (experiment) but you run the risk of loosing a pushrod unless your rockers have deep pockets. Adjusting vales solids or hydraulics is about feel as much as it is about numbers. Unless you got a valve real tight the adjustment is not your problem. Hydraulics are real forgiving. Forgiving enough that you can actually use this chart and get them adjusted in two turns of the crank. Yes it says MOPAR but they have the same firing order. And this actually works believe it or not. I run the vales on a 355 that we race just rolling the crank until the valve is closed, you are now on the heal of the cam and can adjust the preload. Someone is going to doubt my method, no looking for tension and etc. Last we run it we were turning 7200 in the lights on a cam that redlines ( according to the cam card) @ 6200. I got an idea that my method works well enough.