[magicrat56]

Ok, I found this on the power valves.

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"
Begin by hooking a vacuum gauge to an intake manifold-vacuum port. Warm up the engine and note the vacuum reading at idle. Automatic transmission equipped vehicles need to be in the Drive position for this test. Once you have a proper reading, divide the vacuum reading number in half. The divided number will determine the correct power valve that you need.

As an example, a vacuum reading at idle of 13-inches needs to be divided by two, which results in a number of 6.5. Therefore, you should have a number 65 Holley power valve installed in the carburetor. If your divided number falls on an even number, you should select he next lowest power valve number. For example, a vacuum reading of 8-inches, divided by two and you come up with a number of four. In this case, you would use a 35 power valve.


However, if you decide to remove the power valve, then bigger main jets must be installed. Since the power valve is for fuel enrichment, if it is missing, the engine needs to get the extra, required fuel from somewhere. So, If you decide to do away with the power valve, you must increase the main jet sizes considerably (typically 6 – 10 jet sizes)."

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Don't base your P/V on idle vacuum! Base it on your vacuum readings when you're at cruise r.p.m., if you do it off of idle you're going to open it up late.

 

[Malibu ss 64]

I would start with a 6.5 power valve.

 

[Redmanf1]

Well numbers? The one in the red block is what I used for now. Not sure what either number is. Pictures attached.



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