Originally Posted by Barry_Hughes

I usually run 13.5 with a fixed timing end bell (Corally pro red 13.5 - 30 degrees) I am going to try 21.5 using a GM motor.
This motor has adjustable timing is it best to leave it std or put max timing on it and just run boost or should it the timing be retarded like the X-12 (putting it to 4 dot)?