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08-05-2023, 03:03 PM | #1 |
Senior Member
Join Date: May 2010
Location: Plano, Texas
Posts: 872
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Which Power valve
I know this is a loaded question but after several searches here on the forum I came up empty. Asking the rebuilding experts, what power valve for a 94 do you recommend? I am at 500 ft. elevation and running a 59AB, so is 5.5 the correct PV? Thanks in advance.
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08-05-2023, 03:43 PM | #2 |
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Join Date: May 2010
Location: Lakeland Florida
Posts: 304
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Re: Which Power valve
I would use a 5.5. I'm at 800'
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08-05-2023, 03:51 PM | #3 |
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Join Date: Dec 2013
Location: Minnesota, Florida Keys
Posts: 10,405
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Re: Which Power valve
It's a good place to start. Not all engines respond the same to a certain power valve (economizer valve). I had the same problem with Holley 4-BBL on my Corvette (the power valves are almost identical to those in a 94 and work the same way). I drove around for a couple of weeks with the hood cracked and a quality vacuum gauge taped to the windshield wiper and swapped power valves until I found a combination that I liked. I think I ended up with a 6.5.
The number on the PV is the vacuum below which it is supposed to open to enrichen the mixture. I have found that many PV's these days are not marked (at least I can't find 'em). |
08-05-2023, 07:26 PM | #4 |
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Join Date: Jun 2010
Location: Detroit suburb, MI
Posts: 3,712
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Re: Which Power valve
I agree with tubman. I would use a 6.5, escpecially with a mild or stock cam.
I believe that's what charlie ny uses, and he's the best with Holley 94's. Sal |
08-06-2023, 08:36 AM | #5 |
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Join Date: May 2010
Location: Plano, Texas
Posts: 872
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Re: Which Power valve
Thanks for the feedback.
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08-06-2023, 10:10 AM | #6 |
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Join Date: May 2010
Location: Near Rising Sun, Maryland
Posts: 10,862
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Re: Which Power valve
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