okay here ya go..... print this wheel as large as you can make it, then use a peice of thin plastic/aluminum, wallboard and make a wheel and adhere this printout to it..
http://machinerycleanery.com/DWCounterClockwise.htm
the STS 30's timing
238 crank
112 transfer and boost
176 exhaust.
and she's a screamer of a mill big time