The Ford Barn

Planojc · 08-05-2023, 03:03 PM

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.

Angledrive · 08-05-2023, 03:43 PM

I would use a 5.5. I'm at 800'

tubman · 08-05-2023, 03:51 PM

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).

scicala · 08-05-2023, 07:26 PM

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

Planojc · 08-06-2023, 08:36 AM

Thanks for the feedback.

JM 35 Sedan · 08-06-2023, 10:10 AM

Sponsored Links (Register now to hide all advertisements)

Talk to Charlie ny/Charlie Schwendler. He is a great source of information for your needs on these type carburetors. Unfortunately, he has been band from posting on this website.

08-05-2023, 03:03 PM	#1
Planojc Senior Member Join Date: May 2010 Location: Plano, Texas Posts: 1,121	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.

08-05-2023, 03:43 PM	#2
Angledrive Senior Member Join Date: May 2010 Location: Lakeland Florida Posts: 310	Re: Which Power valve I would use a 5.5. I'm at 800'

08-05-2023, 03:51 PM	#3
tubman Senior Member Join Date: Dec 2013 Location: Minnesota, Florida Keys Posts: 12,132	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
scicala Senior Member Join Date: Jun 2010 Location: Detroit suburb, MI Posts: 3,801	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
Planojc Senior Member Join Date: May 2010 Location: Plano, Texas Posts: 1,121	Re: Which Power valve Thanks for the feedback.

08-06-2023, 10:10 AM	#6
JM 35 Sedan Senior Member Join Date: May 2010 Location: Near Rising Sun, Maryland Posts: 10,876	Re: Which Power valve Sponsored Links (Register now to hide all advertisements) Talk to Charlie ny/Charlie Schwendler. He is a great source of information for your needs on these type carburetors. Unfortunately, he has been band from posting on this website. __________________ *John* *"Never give up on what you really want to do. The person with big dreams is more powerful than one with all the facts". Albert Einstein*