Here's a way to find lobe separation, lift, duration, etc. using a 
couple simple tools (dial gauge to find lift measured at the top of 
either your intake or exhaust valve spring retainers with each rocker 
arm correctly set and a crank degree wheel to find degrees of rotation 
at the crank) and a little math 101.  

By following all these steps you should also be able to determine most 
of the important cam profile numbers ground into the cam as it is 
installed in your engine... without removing it to find out.

Step 1 - Put cyl at TDC with both valves CLOSED; i.e. lifters are
         riding on the cam base circle, not on either of the lobes.

Step 2 - Zero the CRANK degree wheel as staring point.

Step 3 - Rotate CRANK until computed lifted is achieved on the
         exhaust lifter/valve, LIFT = (advertised duration x rocker
         arm ratio); e.g. LIFT = .050 x 1.7 = .085. <---
Step 4 - Record how many degrees of CRANK rotation it took to
         get the exhaust valve to start to open by LIFT = .085;
         e.g. Point A = 115 degrees of rotation.

         NOTE: At .050 or .085 lift it is possible both measurement
               points for the exhaust being closed and the intake 
               starting to open will be about the same.  Thus
               Steps 5/6 and 7/8 may be real close together (or
               they may actually be reversed in order) so keep
               your eyes open...

Step 5 - Continue to rotate CRANK until computed lifted is achieved 
         on the intake lifter/valve, LIFT = (advertised duration x 
         rocker arm ratio); e.g. LIFT = .050 x 1.7 = .085. <---
Step 6 - Record how many degrees of CRANK rotation it took to
         get the intake valve to start to open by LIFT = .085;
         e.g. Point B = 335 degrees of rotation.

Step 7 - Continue to rotate CRANK until computed lifted is again 
         achieved on the exhaust lifter/valve, LIFT = .085. <---
         (On its way back towards being fully closed again).
Step 8 - Record how many degrees of CRANK rotation it took to
         get the exhaust valve to start to close down to a 
         LIFT = .085; e.g. Point C = 385 degrees of rotation.
         (Starting on the second full crank rotation cycle, thus
          360 + 5 degrees).

Step 9 - Continue to rotate CRANK until computed lifted is again 
         achieved on the intake lifter/valve, LIFT = .085. <---
         (On its way back towards being fully closed again).
Step10 - Record how many degrees of CRANK rotation it took to
         get the intake valve to start to close down to a 
         LIFT = .085; e.g. Point D = 605 degrees of rotation.
         (Starting on the second full crank rotation cycle, thus
          360 + 245 degrees).

Step11 - Compute Exhaust Duration = Point C - Point A = 385 - 115 = 270.
         This is value XD (for eXhaust Duration).
Step12 - Compute Intake  duration = Point D - Point B = 605 - 335 = 270.
         This is value ID (for Intake Duration).

Step13 - Compute apx Exhaust peak lobe point = (XD / 2) + Point A = 
         270/2 + 115 = 250 degrees (peak lift for exhaust lobe happens
         at apx 250 degrees of CRANK rotation).  This is value XP
         (for eXhaust Peak).

         NOTE: You could also try to note this point by finding 
               the point on the CRANK wheel when the max exhaust
               lift happens and simply note that point along with
               Points A, B, C and D.  The computed point will be
               apx the same IF both sides/faces of the cam lobes are 
               the same.  If the lobe profile(s) is/are not equal or 
               centered around the base circle then finding it via
               max lift may be your only valid option.

Step14 - Compute apx Intake peak lobe point = (ID / 2) + Point B = 
         270/2 + 335 = 470 degrees (peak lift for intake lobe happens
         at apx 470 degrees of CRANK rotation.  This is value IP
         (for Intake Peak).

         NOTE: You could also try to note this point by finding 
               the point on the CRANK wheel when the max intake
               lift happens and simply note that point along with
               Points A, B, C and D.  The computed point will be
               apx the same IF both sides/faces of the valve are 
               the same.  If the lobe profile is not equal or 
               centered around the base circle then finding it
               via max lift may be your only valid option.

Step15 - Compute CRANK rotation between XP and IP = IP - XP = 470 - 250 =
         220 Crank Degrees.  This is value CD (for Crank Degrees).

Step16 - Cam shaft lobe separation = CD / 2 = 110 degrees at .050.