Taking It To The Track

SpeedThrills said

I may be confusing the possible PV issue with having a blown PV? Is that when it'll run rich at idle?
I shifted about 5800, but it was going to about 6500 in the traps, and maybe is pulling vacuum and closing the PV, if I'm thinking right.

Post #9 explains my fuel system, of course, there still could be an issue.

Yeah, I know about the tires.

Click to expand...

You really need to read this thread to understand how a power valve operates. Vacuum keeps a power valve closed.
Power Valve Selection: The Definitive Answer
A blown power valve will pull fuel through the vacuum port and make an engine run pig rich at idle.
I run a 9.5 valve in my 340. Cruise vacuum is 14-15, roll the throttle and the power valve opens. This allows you to run a smaller primary jet at cruise. My PVRCs are .064 and 72 jets up front on a Demon 750DP