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The process for measuring duration is similar to finding lobe centerline, except you measure when the lifter is raised 0.050 off the cam's base circle, or zero lift, (A) and again when the lifter is 0.050 away from being on the base circle again (B).
Camshaft 101 - Timing Tech

 The process for measuring duration is similar to finding lobe centerline, except you measure when the lifter is raised 0.050 off the cam's base circle, or zero lift, (A) and again when the lifter is 0.050 away from being on the base circle again (B).  View Related Article

 

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