Quote Originally Posted by metalchips View Post
Your drawing is goofy, the center line of the lifter bore should intersect with the pivot point or arc center of the cam shaft.
I was under the impression that the lifters sat "ahead" of the cam center line, that way, the lobe pushed them in a more upward direction instead of relying on the wall of the bore to direct the lifter up. I could be wrong.

I had always assumed everything was in line untill a buddy of mine said otherwise... since then, I haven't been able to check.