I'm pulling between 12 and 13 for vacuum in park. But I pull 10 while in gear. So i guess i need to drop to 4.5 PV since its recommended to check it while in gear with an automatic. Just watched a Holley video that said check in gear
The Holley video is wrong. Always was wrong, always will be wrong. Shame on Holley for producing ignorant **** like that. It's moronic. Anyone who tells you to pick power valve opening by idle vacuum is wrong. And always will be wrong.
Idle vacuum has ZERO affect on power valve opening. The later you open the power valve, the bigger the hole in the fuel curve you have to fill with pump shot.
Set your power valve opening by CRUISE vacuum. I'm betting you can use a 10.5 power valve. Probably a 12.5 if you can get one.
Again, don't drop to a 4.5 power valve. Start over, and forget everything Holley says. If they can't get that right, it's no wonder they had to buy Quick Fuel before they went broke.
