its easy, buy a Mr.Gasket Degree wheel from Summitracing.com take them to a lathe, and chuck up the cam between the 2 points w/ the degree wheel sandwiched on one end. put a surface micrometer on the base circle of a lobe. then put a magnetic pointer on the lathe and point it to the degree wheel. now, you can turn the cam in the lathe, and mark on the degree wheel where the surface micrometer deflects. this is the beginning of the "advertised duration". turn the cam thru the end of the lobe and mark where the surface micrometer zeroes back out. this is the end of your "Adv. Dur.". Now, go back, and disregard the number of degrees that it takes to get from 0.00" of fluctation to 0.020" of fluctuation. Begin to measure the Cam duration via your pointed on the degree wheel thru the end of the lobe and record when the pointer comes down back to the 0.020". this is your "Actual duration"... the duration that actually serves a purpose. to measure total lift, put you surface micrometer on the base circle and zero it out. then rotate the cam to the peak lift, and record the measurement.
its pretty easy once its rigged up. i measured the 2jzgte cams back in the day.... or was it the 1jz cams? i think i measured the 2jzgte. my friend has the pics/specs somewhere, i hope.
