Read somewhere... If you don't know the gaps, one way of doing it is the go-no-go way. If a .002" and a .003" feelers fit but a .004" feeler does not, the clearance must be .003". On most engines the intake clearances will be tighter then the exhaust clearances... but not always ! Sometimes they are the same. I have never seen an engine where the exhaust is tighter then the intake. If you are going to make an error, error on the loose side. I've found most engines prefer their valves a bit loose but only one or two thou... not much more. I like to hear just a hint of valve noise. Complete silence bothers me. I keep seeing valves roasting. If you have one rocker arm, operating two valves, with two screw adjusters, you will get a more accurate adjustment if you use two feeler gauges. Loosen both screw adjusters, put the right sized feeler gauges in each tappet and then adjust both at the same time. When both feelers gauges feel like they have the same resistance, when you pull them out, you are done.
