Where was this one installed? Did you run this one on gasoline or alcohol, or maybe you tried both? Just curious. I forget if your son's car was on alcohol.
My target is always 4 degrees advanced. If I have to go 5 to get there no problem. His car has a 750 APD alcohol carb on it. I’m guessing under 11.1 for sure with the 1008 felpro gasket, open chamber 340 style Edelbrock head, plus chamber work that I do.
