The Ford Barn - View Single Post - ANOTHER 94 dual setup question! (just a bit different)

Mart · 04-05-2011, 02:52 PM

Oh well, here we go again.

Here's my experience.

I got a vacuum gauge and watched the vacuum as I drove along. I get 20" plus at idle, and it runs along under light accelleration at about 14 - 15".
I can see no reason not to run stock 7.5" power valves.

I have holley 2100's with 1" venturi's, and use 52 jets.

I tried 4.5 and 3.5 power valves and the 7.5's feel better.

I'd say twin 94's on 21stud with 51 jets will be fine, and depending on your vacuum reading when just driving along or accellerating very gently, go with a power valve rated at about half that number.

One other thing - make sure you use the old type needle valves, the new ones leak and make the carbs flood - hence preventing accurate tuning.

Also a stock fuel pump will be more than adequate for your needs, if in good shape. Although an electric pump can be handy for priming if it has sat for a while.

Not just my opinion. but first hand tried and tested experience.

But others will have different opinions and combo's that work for them.

Mart.

04-05-2011, 02:52 PM	#2
Mart Senior Member Join Date: May 2010 Location: Solihull, England. Posts: 8,755	Re: ANOTHER 94 dual setup question! (just a bit different) Oh well, here we go again. Here's my experience. I got a vacuum gauge and watched the vacuum as I drove along. I get 20" plus at idle, and it runs along under light accelleration at about 14 - 15". I can see no reason not to run stock 7.5" power valves. I have holley 2100's with 1" venturi's, and use 52 jets. I tried 4.5 and 3.5 power valves and the 7.5's feel better. I'd say twin 94's on 21stud with 51 jets will be fine, and depending on your vacuum reading when just driving along or accellerating very gently, go with a power valve rated at about half that number. One other thing - make sure you use the old type needle valves, the new ones leak and make the carbs flood - hence preventing accurate tuning. Also a stock fuel pump will be more than adequate for your needs, if in good shape. Although an electric pump can be handy for priming if it has sat for a while. Not just my opinion. but first hand tried and tested experience. But others will have different opinions and combo's that work for them. Mart.