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afb manifold slots

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  • afb manifold slots

    Why are some of the afb manifolds slotted between the bores
    and some are not?
    64 Champ long bed V8
    55/53 Studebaker President S/R
    53 Hudson Super Wasp Coupe

  • #2
    Depends on the manufacturer.
    The 'balance slots' tend to even out any pulses at idle (high manifold vacuum).
    It cost's money to make slots, so some cut that corner figuring a performance intake manifold doesn't spend most of it's time idling.
    Removing the center divider hurts idle, too. At WOT and higher rpm, you can get away without one, but the idle to 3k range will suffer.

    quote:Originally posted by Kdancy

    Why are some of the afb manifolds slotted between the bores
    and some are not?

    Brooklet, Georgia
    '37 Coupe Express (never ending project)
    '37 Coupe Express Trailer (project)
    '61 Hawk (project)

    HTIH (Hope The Info Helps)


    Get your facts first, and then you can distort them as much as you please. Mark Twain

    Note: SDC# 070190 (and earlier...)


    • #3
      The word Jeff uses..."suffer" is a very "relitive" term.
      While he is technically correct why the slots are there, only those with the most sensitive butts will recognize any drivability or idle problems.
      And how many really care if it idles at 700 rpm or 725rpm?

      A "fully" divided manifold will perform better at lower rpm's.
      A divider that has been cut down ([u]OR</u> a spacer was added!!!) will give the advantage to the mid-range and upper rpm range.

      I'll bet all those who added a spacer to install an Edelbrock carburetor never even realized an idle difference once the tuning was done(!)!