Haynes manuals are around $20, and this proceedure is covered, including tollerance specs. I don't remember exactly what the "correct" proceedure is, but I do know that there is a table for intake and exhaust correspondence, and it tells you which valve to adjust when another valve is open, so you only have to rotate the engine once! Running tight valves is dangerous, you can burn a valve if you are a little too tight. Besides, for less than the cost of spark plugs you could have a book to tell you how to do it correctly!!!!