So all of the Mopar purple shaft cams listed in the linked document the .050 is a number calculated as a fixed percentage of the quoted duration. That is not an accurate method to quantify the ramp on the lobe.
Exactly. Using the multiply-the-listed-duration-by-.85 to calculate the duration at .050 of the big block 676 cam (272 duration, .455 lift), just for one example, you get 231 duration at .050. Actual @.050 duration for that cam is 224.
