We put an original 67 Commando cam with 50,000 miles on the odometer on a cam doctor at Racer Brown and got the .050 duration numbers. I'm satisfied those are correct minus .010 lift from wear. Next, what lobe masters are available? Racer Brown came pretty close. The Isky E-4 is close with .425 lift but has 216 duration @ .050. A 340 cam has how much duration@ .050? 210? 212?