Other I need degree numbers for a motor from port map numbers

[jetski9010]

I know I have seen some of the pros talking about this on here before but I cant find the post. I have a port map layout of a motor I am playing around with right now and I am trying to find out the degrees of the ports. Can someone tell me how I get those numbers?

 

[jetski9010]

found one. Here it is if anyones else needs one. http://modelenginenews.org/design/tcalc/TCalcForm.php

 

[SUPERTUNE]

Here's another one...

http://john.rushworth.com/Pics/Piston/