Thread: Holley 390 specs

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  1. #1 Holley 390 specs 
    Little Brit
    Join Date
    Jan 2014
    Location
    Lakes region of NH
    Posts
    13
    Am interested to know what 8 owners with Holley 390's might be running for carb internals, or recommendations. My engine is:

    3.5
    9.65:1 CR
    small Erson cam
    Edlebrock Performer intake
    stock TR8 cast exhaust manifold

    My Holley 390 specs are:

    Main jets - 54
    secondary metering plate (do not have the Holley # handy but jet equivalent is) - 56
    power valve - 9.5 (reading a good 17.5 HG at idle)
    squirter - .18
    accelerator pump cam - white
    secondary vacuum are as supplied, not sure what it may be.

    I'm just curious as to where I may be in the tuning department, car runs well, could always run better.
    Thanks
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  2. #2  
    Little Brit
    Join Date
    Jan 2014
    Location
    Lakes region of NH
    Posts
    13
    Hmm, does no one have this carb or doesn't anyone really know what's in theirs?
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  3. #3  
    I never really got mine dialed in before I went with a FiTech. But I believe I upped the squirter, and may have gone with an 8.5 power valve. I think my pump cam was red or pink. I may have ended up with 52 mains.
    ---------------------------------
    Darrell Walker
    66 TR4A IRS-SC CTC67956L
    81 TR8 SATPZ458XBA406206
    Vancouver, WA, USA
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