Hey, how do you know if you need a high flow power valve or a standard one? My motor makes around 460 fly HP, around 350 at the wheels. I idle at around 6" of vac. and I have an out of the box 750 Holly DP. I hear these have 6.5s so my PV must keep opening. I want to get a 4.5 but am not sure if i should get the high flow one. What do you guys recommend?

 

I can't say I know what makes a PV "high" or "standard" flow, but looking through the Holley numerical listing, the only application they use high flow from the factory is alcohol carbs.

 

You lost 110 HP through your drivetrain?

 

Well something like that. I am not sure since I never dynoed the motor. But I have bog parts on the car, they make more friction and have more rotating mass. The moser 12 bolt is HUGE. And the T-56 is also heavy and big. I also have an extra thick flywheel that needed to be custom made to fit the T-56 to the Gen I block. I have herd you lose like 20%-25%, so I guess more like 430, something like that. I dunno. I am also running a stock ignition and just tossed it all togeather. I got my MSD digi box, dizzy and coil yesterday, I should be making a bit more after that.