from Ted Harbit:


"The original R 1 and R 2 cam has about 224 degrees duration @ .050" with advertised or running duration of 260 degrees. The lobe lift is .2833" with gross valve lift of .425". Centerline installation is about 110 degrees. Lash is .024" hot.

The R 2+ has about 229 degrees duration @ .050" and about 268 running. The lobe lift is .298" with gross valve lift of .447". You also gain some lift as the lash is set tighter (can be set as low as .010" but suggest starting at about .020" and if too much lifter noise, tighten a couple thousandths at a time until quiet enough to suit you. Most find .020" satisfactory. The .020" will give a little more idle vacuum."