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Thread: help ID unique carb stacks

  1. #1
    Senior Member
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    Mar 2004
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    Castro Valley, Ca.
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    help ID unique carb stacks

    ID 47mm no taper. overall length 90mm top to bottom. not sure what the second flange is for.
    what effect would the extra length have ? (55mm stack for comparison)
    TIA
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    84102 purchased in '85 FINALLY started driving it (2/2015)
    '73 911T original paint sunroof coupe waiting in the wings
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  2. #2
    Senior Member BURN-BROS's Avatar
    Join Date
    Sep 2003
    Location
    Camarillo, Ca.
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    153
    It is provision for either air filter bases or for bodywork to separate the engine compartment from the induction/intake area.
    Aaron Burnham
    Burnham Performance
    1071 Avenida Acaso ste D.
    Camarillo, Ca. 93012
    805-240-6931

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  3. #3
    Oil Cooled Heart Bullethead's Avatar
    Join Date
    Jul 2008
    Location
    South Florida
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    2,195
    Yeah, the flanges are probably for air cleaners... regarding stack length, short makes power at high RPM, long is better for low to mid-range. Helps to tune the exhaust length accordingly.
    Russ

    ESR # 1537

    '62 356S Notchback Hotrod
    '67 S Das Geburtstagsgeschenk
    '68 T Targa Sportomatic
    '68 L SW Targa Sportomatic
    '70 914/6 GT

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