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Old July 16th, 2009, 01:19 PM   #1
eswiger
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?tuning truck avenger?

I am about to pull my hair out. I have a holley 670 truck avenger on a mild 401 jeep. Can't seem to get the thing to run good at WOT. Any suggestions on jetting would be greatly appreciated. It runs great at half and 3/4 throttle but as soon as I give it there is a hesitation before it comes to life again. Hope there is some one running this carb on a jeep 360 or 401 that can tell me the correct jetting.
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Old July 16th, 2009, 01:24 PM   #2
360cj579
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PM V8CJ... he had a similar problem and called Holley, they sent him some new parts to fix something that went wrong during production. All was well when he installed them.
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Old July 16th, 2009, 01:39 PM   #3
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I have talked to Holley several times and changed both metering blocks. Still not much better. I have heard changing the accelerator pump nozzles or jetting helps but would like to hear first hand from someone.
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Old July 26th, 2009, 11:09 AM   #4
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not trying to hijack your thread but i am having the same problem with my 670 ta. brand new and it and bogs bad at WOT and will not pump fuel to start on it's own. pour fuel down the carb and it fires right up and idles nice but still bogs bad.

i too am stumped.

if you figure it out could you post your findings?

i'm going to work on mine some more today so if i get it i'll post it.
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Last edited by creeping death; July 26th, 2009 at 11:16 AM.
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Old July 26th, 2009, 05:53 PM   #5
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Throw them away, you'll save your sanity.
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Old August 4th, 2009, 12:16 PM   #6
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i called holley and the told me exactly what to do to fix my problem. for mine, if you look down the secondaries there is a large philips head screw i took it off of there, sprayed some wd40 to loosen up the needle and pumped it a few times and and she broke loose. they wet test them with mineral spirts and they said it dried up causing the needle to stick. it dose not bog too bad anymore but still needs a little tuning.
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