Quote Originally Posted by shine View Post
why are you running 7 psi on fuel pressure ? is it street driven or an 1/8 mile car ?

divide your vacuum at idle x2 . this will give you the size power valve you need. if you have 13-14 then the 6.5 will work . most likely the valve is blown .
Agreed, 7 psi is a little high, while the manufacturer may claim higher psi is OK, I, like you would not.

Also agree under normal circumstances this is the formula for power valve tuning, normally with a tuned carb this will allow the power valve to open under acceleration, and good a starting point to tuning the circuit.

However, and JMHO,
Not getting enough fuel at WOT is not the OP's case, and a lower value power valve may make matters worse until the cause of the way overly rich condition is sorted out. The power valve may be bad (blown), and why I recommended a higher value power valve to help source the cause for the problem.

Again, JMHO, I believe there is more going on here than the OP has the skills and knowledge for, and his continued hit and miss approach may cause damage to his motor before he sorts it out.

I reiterate my recommendation for the OP to seek the skills and experience of a motor tuner knowledgable in carbs to help sort this out. A few dollars spent on a skilled tuner now may save thousands of dollars later.