Bonjour!
I have two flat tappet camshafts. Different manufacturers, one solid, the other hydraulic. different applications but same engine series (BBM).
I have found both camshafts have a a base circle that drops .001" approximately 50 crankshaft degrees (25 camshaft degrees) prior to the ramp.

Q. #1. Is this drop prior to the ramp what is referred as the heel? I think the answer is yes, but seeking a second opinion is always a good thing.
Q. #2. What's it's purpose? To put oil under lifter base?
Q. #3. When mapping a camshaft should the dial indicator be zeroed at the base .000, or the drop (heel) prior to the ramp? I assume the base and not the heel, for valve adjustment EOIC puts the lifter at the base and not the heel.
Q. #4. What is the typical length of the take-up ramp on a solid (mechanical) 7*, 8*, 15* of camshaft degrees??? And, again is this measured from movement zeroed on the heel or zeroed on the longer base?

OK, Thanks.