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    Author Topic: 4 corner idle  (Read 621 times)

    Offline dodj

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    4 corner idle
    « on: June 19, 2014 - 08:29:03 AM »
    OK, I now have a carb with 4 idle screws. Are they all supposed to be adjusted equally? Like all 4 one turn counterclockwise?
    Right now I have the secondary screws at about 1/2 turn out and the primaries at 1 turn out and the AFR is reading at 12.5. Should they all be the same? The factory setting was 3/4 turn out at the secondaries and a little over one turn out primaries. I can adjust it so the afr reads 14-14.5 but the secondaries are only about 1/4 open, primaries 3/4 open :dunno:. Is that ok?
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    Scott
    1973 Challenger  440 4 spd 
    2007.5 3500 6.7 Cummins Diesel, Anarchy tuned.
    Good friends don't let friends do stupid things. ........alone.


    Offline inviolet

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    Re: 4 corner idle
    « Reply #1 on: June 19, 2014 - 10:05:38 AM »
    I have 4 corner Idle too and yes Holley does recommend they are all turned out the same amount.
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    Offline cudabob496

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    Re: 4 corner idle
    « Reply #2 on: June 19, 2014 - 11:20:51 AM »
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    72 Cuda, owned 25 years. 496, with ported Stage VI heads, .625 in solid roller, 254/258 at .050, 3500 stall, 3.91 rear. 850 Holley DP, Reverse manual valve body.

    1999 Trans Am, LS1, heads, cam, headers, stall, etc! Love to surprise the rice rockets with this one. They seem so confident, then it's "what the heck just happened?"

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    Offline Chryco Psycho

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    • 70 Challenger R/T SE 70 tube Chassis Cuda now sold
    Re: 4 corner idle
    « Reply #3 on: June 19, 2014 - 11:49:21 AM »
    Yes & no assuming the throttle plates are all open equally the idle screws should all be even , , if the secondary plates are closed down you would need less idle mix so if it runs right 1/2 turn out on the rear & 1 turn out on the front you are OK
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    Challenger - You`ll wish You Hadn`t
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