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holley jets versus metering rods

Discussion in 'The Venerable Q-Jet' started by monkeyy337, Apr 24, 2007.

  1. monkeyy337

    monkeyy337 monkeyy337

    Has anyone used holley jets in a 4-barrel Q-jet versus the metering rods? I changed my 2-barrel (1/2 a Q-jet) over and it works fine but was wondering if the same combo will work OK on a 4 barrel version. Thanks
     
    monkeyy337, Apr 24, 2007
    #1
  2. Schurkey

    Schurkey Silver Level contributor

    1. The threads are different, if you screw Holley jets into a Rochester you're going to destroy the threads. Why not just buy Q-jet style jets?

    2. Metering rods are superior to Holley's on/off power valve. Metering rods allow a range of mixtures based on vacuum (load); the power valve has a lean and a rich setting with nothing in between.

    3. Are you saying that you take the metering rods OUT and don't replace them? I hope not; you'd be full-rich all the time. Your fuel economy and emissions would both be terrible.
     
    Schurkey, Apr 25, 2007
    #2
  3. monkeyy337

    monkeyy337 monkeyy337

    1. Yes the threads are alittle different but once you screw the holley jets in if you need to change the jets the next ones screw in OK. I didn't buy Q-jet style jets because I had a bucket of holley jets to work with.
    2. I obtained the correct mixture using different jet sizes, two 53 jets worked fine
    3. Yes I took the metering rods out along with the small spring clip that holds them. I left the hanger in the carb. I don't have any idea what the emissions are (there is no check here in Bowling Green, Ky) but my fuel economy is the same that it was with the metering rods installed except that I have a 3:73 gear now versus the 2:56 orginal gear. The carb has been set up this way for the past three years with no problems. I race it every weekend. I'm not saying this is the way to go but its the way I went. I was just wondering how it would work on a 4-barrel carb.
     
    Last edited: Apr 25, 2007
    monkeyy337, Apr 25, 2007
    #3
  4. Nicholas Sloop

    Nicholas Sloop '08 GS Nats BSA runner up

    Not that I would do it, but if it works on the DualJet (the half-a-Q-jet), I don't see why it wouldn't work on a Q-jet
     
    Nicholas Sloop, Apr 26, 2007
    #4

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