That seems to me to be a sensible method. If the valve has enough clearance at 10BTDC it MUST have enough clearance at 24BTDC unless the camshaft has a hump in its curve (joke).
Isky used to post VOTDC figures but I wasn't aware the others did that, too.
R.
Comp has the info in the master lobe listings. Usually tappet lift at 106 and 110 ICL's IIRC.
