I was always under impression that the clearance ramp was a gradual rise at the entry to the lobe to take up valve train clearance on a mechanical grind. Typical hydraulic grind not having such a clearance ramp.

Or are we talking about to different ramps? One that dips on front of the lobe and a second for solids that has a slow take-up at the entry to the lobe?

I'm mapping a hydraulic flat tappet as I write this and this one has "dip" coming off the intake lobe as well as the dip in front of the lobe. But the dip coming off the lobe is about .0009' and the dip in front of the lobe is .0011'. Difference is meaningless I'm sure, but interesting non the less.

Thanks