Holley Sniper EFI update

Discussion in 'High Tech for Old Iron' started by Kaule, Jun 12, 2018.

  1. Kaule

    Kaule Gold Level Contributor

    I have the Holley Sniper EFI on my 350 and problems with a slow start.
    but i read about it in the holley forum -> main and secondary opens at the same time.

    Now there is a firmware update and a rod:
    "Holley 4010 & 4150 Mechanical Secondary Linkage Rod"

    I have ordered this rod, but it is still traveling in USA
    so i tryed to build it self with 4 mm copper rod ( little more than 1/8" )

    the first one was to long, the second to short, the third was good :)

    the third on the picture was the original rod

    here is the new rod in place

    now i come out the garage without barking tires :D
    Briz likes this.

    NOTNSS Gold Level Contributor

    Nice work! About to finish up my Holley Sniper on my 70 GS. Is an external throttle return spring needed on the Sniper?

  3. Kaule

    Kaule Gold Level Contributor

  4. hunter7389

    hunter7389 Well-Known Member

    Holley STRONGLY recommends and external throttle return spring
    TheSilverBuick likes this.

    NOTNSS Gold Level Contributor

    Not finding a great spot to mount the spring.. I'll keep looking.

    Had the Holley Sniper out for it's first 10 miles just now. What a difference in throttle response, zero detonation, AFR looking good. Really feels like a different animal. Now to drive it and let it learn.
    TheSilverBuick and sriley531 like this.
  6. BillA

    BillA Well-Known Member

    My Holley Terminator came with a throttle cable bracket that had two small holes drilled in it for the throttle return spring(s). Does the Sniper not come with the throttle cable bracket?

    NOTNSS Gold Level Contributor

    There are holes for either 200 4R or 700 R4 kickdown but not finding anything with the correct geometry. The smaller holes won't take the bend in the end of the spring. Will get into it and figure it out.
  8. Kaule

    Kaule Gold Level Contributor

    after reading about the recommend external throttle return spring
    i have found out my old spring fits this way


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