2 barrel to 4 barrel

Discussion in 'Jeeps with the Buick Heartbeat' started by spitzer625, May 13, 2010.

  1. spitzer625

    spitzer625 New Member

    Anyone done this and what si reccomended....adapter or swapping intakes. Any other must do mods when doing this???? cam, etc?
  2. moleary

    moleary GOD Bless America

    what are you working on? Intake swap is the way to go..
  3. geologyjeep

    geologyjeep Mr. Ed of Denver

    I've done this years ago for two '68-'69 Wagoneers with 350 cid Buick engines. Buick 4-bbl manifolds are pretty common and I swapped manifolds. For one I used the Buick Quadrajet carb that came with the manifold for the other I got another carb. Really pleased with results. Mr. Ed

    DEADMANSCURVE my first word : truck

    this is a 350 correct ? ( or did ya sneak in a 455 ) post questions threads up in the "small block" section for motor stuff - be sure and tell 'em its a jeep and they may want to know tire size , weight , gearing etc . a nice manifold will take $50-100 plus shipping ( cast - yike$ ! ) if needed . and if i'm gonna guess , they seem to be going up a little . a nice new TA dual plane will be $350.00 .
    oem cast mod steps would probably be :
    > basic port matching on the head side , and a little on the heads wouldn't hurt obviously .
    > grinding away/blending the area between the primary and secondary holes on the carb pad - compare like an TA intake or sbc edelbrock performer intake with the oem buick and you'll get the idea - a couple guys have some pics up showing how they did it . may not need for a lower rpm torque motor .
    > if ya run a holley/edelbrock pattern carb you will need an adapter ( 4 hole ) and if ya run a q-jet pattern carb you won't need an adapter but some suggest using a 1" spacer ( 4 hole with non mod carb pad , not sure if its been ground out ) .
  5. Macjeeper

    Macjeeper MAC

    I've been toying with the idea just to be different, about keeping my Rochester 2GV 2 bbl Carbs and getting the 4 bbl Intake Manifold and get the Vintage Speed multiple 2 bbl Carb adaptor and use them for 4 wheeling.

    Anyone have any experience on using this on Buick 350v8's?
    I don't want the bogging issues on inclines or descents on 4x4 trails.


    Thanks, Mac

    DEADMANSCURVE my first word : truck

    functionality wise , i would either use a mod'd 2bbl intake with a well prepped 2bbl carb - some of those you can get @ 500cfm - should be plenty of cfm for torque , or a 4bbl intake with a off-road prepped 4bbl carb - not too big - maybe like 650 cfm max . keep the response/velocity up . one of our customers runs propane in his rock crawler - he said no matter what carb he ran - steep angles equalled problems . and i think multiple carbs may be a hassle also to keep set up perfectly . del
  7. sean Buick 76

    sean Buick 76 Buick Nut Staff Member

    I would use a TBI setup for extreme angle wheeling. In a wheeling mag they rated the Q jet above all other carbs for offroading, however they all have thier limits for angles.

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