[Jeff Higgins]

I think Wayne's book is a bit misleading on this. This is not a matter of camshaft profile, it's a matter of how the drive sprocket is secured to the camshaft. Early camshafts (what Wayne refers to as "high lift") have the protruding center "spud" with a big nut that goes over it and is tightened down to secure the sprocket. Later cams do not have that "spud", nor the big nut. They have a center bolt.

We put a special wrench over that center "spud' to hold it while we torque the big nut. That "spud" also allows us to turn the camshaft separately from the crankshaft. We take advantage of that and set the crank to "Z1", then disengage the camshaft sprocket and turn the camshaft to the timing spec.

Well, we cannot do that with the newer center bolt design. There is no way to turn the camshaft separately from the crankshaft. Now we are forced to use the crankshaft to turn the camshaft to the timing spec. So, we do that, then disengage the two and move the crank back to "Z1".

If we are running "high lift" camshafts in a 3.0, 3.2, or any engine with the center bolt design, we still have to use Wayne's "low lift" timing method. So, it's more a matter of Porsche having upgraded the design of the end of the camshaft where the sprocket attaches than a matter of lift. Kind of misleading the way Wayne describes it.