a good tool is to put a vacumm gauge on ur car in drive at idle and see what the reading is go with the lowest reading is and what i do but everyone is different split it in half anf thats the correct powervalve.. ..
at idle I run about 5" of vacuum. So 2.5 is what I want?
Also what is the difference between dual stage and single stage power valves. What exactly does a power valve do.
