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whats the size of the 3.4 dohc throttle body?

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  • whats the size of the 3.4 dohc throttle body?

    i just picked one up at the salvage yard, want to know if its going to be good for my 3500. ive got a 70mm on there right now, and i fear its too big
    3500, 1280 cam and PR, ls6 valve springs, port and polished heads, ported lim, ported uim, 4.3 70mm tb, ported trueleo headers and y pipe ALL FOR SALE (minus the car)
    96 LT4 6spd corvette. 355, AI 215cc LT4 Comp CNC Heads, Prope SRS pistons, Ported intake, ARH long tubes, Corsa Indy Pace 4:10 gears
    2012 Chevy Sonic Turbo 6spd
    1970 M35A2 Deuce and a Half, Spin on filters, Turned up IP, HIDs, Flat Black, 11.00x20 singles.

  • #2
    64mm
    Ben
    60DegreeV6.com
    WOT-Tech.com

    Comment


    • #3
      thanks
      3500, 1280 cam and PR, ls6 valve springs, port and polished heads, ported lim, ported uim, 4.3 70mm tb, ported trueleo headers and y pipe ALL FOR SALE (minus the car)
      96 LT4 6spd corvette. 355, AI 215cc LT4 Comp CNC Heads, Prope SRS pistons, Ported intake, ARH long tubes, Corsa Indy Pace 4:10 gears
      2012 Chevy Sonic Turbo 6spd
      1970 M35A2 Deuce and a Half, Spin on filters, Turned up IP, HIDs, Flat Black, 11.00x20 singles.

      Comment


      • #4
        Just wondering why you feel it's too big. Stock is 65 but you got headers, cam, etc. Not sure at what point that 65mm would be a bottle neck though. Are you feeling no increase from mid-throttle to WOT in power or something?
        sigpic New 2010 project (click image)
        1994 3100 BERETTA. 200,000+ miles
        16.0 1/4 mile when stock. Now ???
        Original L82 Longblock
        with LA1, LX9, LX5 parts
        Manifold-back 2.5" SS Mandrel Exhaust. Hardware is SS too.

        Comment


        • #5
          Originally posted by IsaacHayes View Post
          Just wondering why you feel it's too big. Stock is 65 but you got headers, cam, etc. Not sure at what point that 65mm would be a bottle neck though. Are you feeling no increase from mid-throttle to WOT in power or something?
          crazy reasons. large plenum, smaller tb. long story and entirely too much to explain. but weve covered it here before.

          also im getting a huge hesitation when going from closed throttle to WOT. like the rpms dip to around 500 and then it revs a second later. if i mash it all the way, the engine will die. not fun for driving.

          either way ill have the 70mm and the 64mm for testing this larger plenum - smalller tb thing ive read about. if i can finally get to the dyno well have some hard data on differences between tb's and thier size vs plenum volume
          3500, 1280 cam and PR, ls6 valve springs, port and polished heads, ported lim, ported uim, 4.3 70mm tb, ported trueleo headers and y pipe ALL FOR SALE (minus the car)
          96 LT4 6spd corvette. 355, AI 215cc LT4 Comp CNC Heads, Prope SRS pistons, Ported intake, ARH long tubes, Corsa Indy Pace 4:10 gears
          2012 Chevy Sonic Turbo 6spd
          1970 M35A2 Deuce and a Half, Spin on filters, Turned up IP, HIDs, Flat Black, 11.00x20 singles.

          Comment


          • #6
            If it bogs, you can tune for that. Still too much TB to me for but it should be touchy, not bogging.
            Ben
            60DegreeV6.com
            WOT-Tech.com

            Comment


            • #7
              ill talk to ryan gick more, im waiting on my data logging shit to get here so i can show hime whats going on

              70mm too big? why do you say (i agree, just want to hear your insight)
              3500, 1280 cam and PR, ls6 valve springs, port and polished heads, ported lim, ported uim, 4.3 70mm tb, ported trueleo headers and y pipe ALL FOR SALE (minus the car)
              96 LT4 6spd corvette. 355, AI 215cc LT4 Comp CNC Heads, Prope SRS pistons, Ported intake, ARH long tubes, Corsa Indy Pace 4:10 gears
              2012 Chevy Sonic Turbo 6spd
              1970 M35A2 Deuce and a Half, Spin on filters, Turned up IP, HIDs, Flat Black, 11.00x20 singles.

              Comment


              • #8
                Heh, how about me? I have a 3500 plenum and 52mm TB on right now! LOL. Talk about big plenum small TB!
                sigpic New 2010 project (click image)
                1994 3100 BERETTA. 200,000+ miles
                16.0 1/4 mile when stock. Now ???
                Original L82 Longblock
                with LA1, LX9, LX5 parts
                Manifold-back 2.5" SS Mandrel Exhaust. Hardware is SS too.

                Comment

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