Eric's cam challenge

junkyardhero said

it's the diameter of the roller lifter wheel.

different diameter will give different duration numbers.

there's also a whole bucket full of other things involved on wheel size, but that's the basics of what's being discussed here in regards to measuring out a cam.

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No. That's not what I was speaking about. The industry standard for the given in the formula for calculating duration @ .050" is .750. Mopar performance used .850 for that given instead of .750. I used to know the formula off the top of my head, but I don't anymore. It's in the MP engine manual, which I am too lazy to go dig out.