My mechanic said to set my valves at a tight 11. So I just set mine to that a week ago. I also changed the plugs to NGK and new distributor cap, rotor and 8mm wires from Kingsbourne. My car idles very smooth and runs smooth as silk. Right now I could not be happier.
I saw that the book said 12 but Jake has been doing this for about 35 years. YMMV.
Mike Holbrook
Meridian, Idaho
1992 535im, 17", Euro M5 Throwing Stars 8's & 9's, FK-451 235/45s & 255/40s, M5 Sway Bars 25/20, Conforti chip, Lowes Ram Air, glass sunroof