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DaytonaTunnel I am running 5.5 for power valves in my 950 holleys. The motor is a 572 bbf with 8-71. It is still pulling vacume at 4500rpms when just cruzin. Sweet boat by the way.
 

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Anyone running power valves ?

I am running a brpv in my primary side and not in the secondary. I actually made mine out of a factory power valve and was kind of leary to try it but it actually works awesome. I thought i was going to have to screw with it a lot to make it work smooth throughout the rpm range but i was pleasantly surprised that it basically worked perfect with my guess on spring tension. It no longer leans out up top and never varies more than half a point on the wideband throughout. I am running a blow through setup and I can point you in the right direction if you are too, but..... if you have a roots type deal then I will be absolutely no help to you.

jake
 
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