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03-30-2011, 02:28 AM | #1 |
Senior Member
Join Date: Aug 2010
Location: Whangaparaoa New Zealand
Posts: 263
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Holley 390 carb
Hi guys, I've just installed a new out of the box 390 holley on my 59a in my 37 pickup.It runs great,but I can't get the idle speed below 800 rpm.I've checked that the choke ,fast idle screw are not touching,nothing interfering with the linkage etc,I can back the idle speed screw right out.The butterflys look completly shut.If I clamp the pcv hose the revs drop by about 100 but still not enough.I have good steady vacumn of around 20 whatsits,I can't belive it's getting enough air to rev so high.If I lean out the mixture screws the speed drops,but it then runs like a sack of shite.I don't believe I have any vacumn leaks but am open to any and all suggestions.Thanks in advance Kiwi Tony.
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03-30-2011, 04:50 AM | #2 |
Member Emeritus
Join Date: May 2010
Location: Fitzgerald, Georgia
Posts: 2,204
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Re: Holley 390 carb
I have played with a number of Holley 4 barrel carbs and had 2 instances where the secondary throttle stop screw did not allow that set of throttle plates to completely close. I do not remember whether these were 390, 600, 800 or whatever size carbs, but it is worth checking.
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03-30-2011, 12:06 PM | #3 |
Senior Member
Join Date: May 2010
Location: Southern Maine
Posts: 1,498
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Re: Holley 390 carb
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