IDing an unknown spe PurpleShaft?

[GoodysGotaCuda]

I have, what i have been told, is a '.509 MP purpleshaft'.  I know nothing more on it, There are a couple cast numbers and such, is there any markings on it that give away what the specs would be? If not, just use a mic and check the lift? anyway to figure out the duration?

Thanks 

[Chryco Psycho]

if you know it is a purple shaft mic the lift

[GoodysGotaCuda]

if you know it is a purple shaft mic the lift

]

Mic a lobe? or stick it in the motor and see how much the lifter goes up? micing a lobe i got .408...which cant be right x 1.5 = .612 

[tactransman]

Lobe measurement minus base circle X rocker ratio (1.5) = lift

[GoodysGotaCuda]

Lobe measurement minus base circle X rocker ratio (1.5) = lift

How do i figure out the base circle? thanx

[tactransman]

measure it ( 90 degrees from the lobe)  straight across in the first pic on the left

[GoodysGotaCuda]

So would the one on the left be the right spot to measure for the base circle? And the right would be the lobe measurement? 

[tactransman]

Yes and Yes

[GoodysGotaCuda]

ok well i either

A) cant totally read a caliper mic
or
B) cant totally read a caliper mic

Because i'm coming up with like .6xx lift  I'm getting, what i think is 1.684 total lobe height, and pictured...what i think is 1.261 (.5)

Is that whats pictured? or am i just totally 

[tactransman]

Maybe it is not a .509 cam?
Mopar Cam Specs: