Holley 94 Jets
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Tuned
Joined: Nov 2017
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From: Cicero, IN
Holley 94 Jets
I have a holley 94 carb on a 1953 flathead V8 (239 8BA). I have seen various recommendations for jet size depending on ambient temperature and elevation. My truck will be used exclusively at 1000 feet above sea level with most ambient temperatures between 50F and 90F. I have tried .051 and .052 jets and noticed little difference between the two. I would be interested in recommendations as to the optimum jet size for this truck and conditions.
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Tuned
Joined: Nov 2017
Posts: 302
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From: Cicero, IN
The power valves that I have don't seem to have any markings as to pressure spec. Shouldn't they have something stamped on them? I am going to try some different ones like you recommend. Thanks for the help.
Hotshot
Joined: Oct 2009
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From: Burbank, WA
With all the diagnostic gadgets available now, a handheld tailpipe sniffer might be a fun investment for you. It'll let you zero right in on optimizing your tuning by reading what's in your exhaust.
Fleet Owner
Joined: Jul 2004
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From: NM
Here's a short video of the AFM in action (actual speed is 62 mph on I-25):
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2nd Gear
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ALBUQ F-1, Can you tell me what Jets and power valve you are running at 5000 ft ? I am currently setting up a triple 94 carb set up for a Studebaker. I do have an O2 sniffer I will be using but what you are running would at least give me a good starting point?
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Fleet Owner
Joined: Jul 2004
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From: NM
I'm not running the Holley carb anymore, but the jets I was using when I had it were #51 (stock) and 6.5 power valve. I tried as low as #49 mains and there was little difference. The power valve makes a bigger difference, and I would go as low as 5.5 with your setup, IF you will be driving at 5,000' and higher.
Setting the idle mixture screws as lean as you can without poor idle quality makes a big difference all the way thru mid-range.
Setting the idle mixture screws as lean as you can without poor idle quality makes a big difference all the way thru mid-range.
2nd Gear
Joined: Oct 2024
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I'm not running the Holley carb anymore, but the jets I was using when I had it were #51 (stock) and 6.5 power valve. I tried as low as #49 mains and there was little difference. The power valve makes a bigger difference, and I would go as low as 5.5 with your setup, IF you will be driving at 5,000' and higher.
Setting the idle mixture screws as lean as you can without poor idle quality makes a big difference all the way thru mid-range.
Setting the idle mixture screws as lean as you can without poor idle quality makes a big difference all the way thru mid-range.
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