20) When you're looking at a cam spec card and you see open at 7 degrees BTDC, is that 7 cam degrees or 7 crank degrees?
21) Just to verify, 90 degrees on the cam is a single stroke while 180 degrees on the crank is a single stroke. Therefore, if you wanted to have an even exactly half-way through a stroke (just as an example) the event would be at 45 cam degrees ATDC (again, just for an example) or 90 crank degrees ATDC. Right?

 

Crank degrees. LSA is the only cam measurement made in cam degrees.

Yes. Id refer to it as 90* ATDC since TDC is a function of the crank and not the cam.