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3500 heads on 3400 stock

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  • #1

    3500 heads on 3400 stock

    Hi, I have a 3400 1999 in my Cavalier that i'm presently rebuilding and i also have a complete 3500 LX9, and I montana 2000 that I bougth for the newer intakes.

    What i was originaly planing to do was to keep my engine stock with the 2000 intake style and put an Aurore LX5 throttle body. Now i'm thinking to get the 3500 heads with the lower 3500 intake and the 3400 upper intake from my montana, also with aurora TB and probably with and injectors upgrade.

    My question is that with the hybrid the compression will drop to 9.1:1, so will I can gain something with this combo or due to the lower compression I will lost gain that the 3500 heads can give me?
    Last edited by Sleeper3400; 06-28-2009, 08:23 PM.
    Cavalier 1999
    3400 from an Alero
    Clutchmaster Stage 3
    Accel coils
    2.5" exhaust with only one Cherry Bomb Vortex
    Hybrid on the way
    Tags: None
  • #2
    You will still gain some over the stock 3400 setup. The 3500 heads flow much better than stock 3400 heads. plus your only going down .4 points of compression that's not a huge amount.

    Got Lope?
    3500 Build, Comp XFI Cam 218/230 .050 dur .570/.568 lift 113LSA
    Fully Balanced, Ported, 3 Angle Valve Job, 65mm TCE TB, S&S Headers.
    Stage-1 Raybestos/Alto 4t60e-HD, EP LSD, 3.69FDR
    12.61@105 Epping NH Oct 2015 Nitrous 100shot (melted plugs) 13.58@98.8 N/A 3200LBS

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    • #3
      Use the 3500 upper too. And you won't have to port out the neck for the TB too that way!
      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

      • #4
        ahh porting the neck isnt that hard. its the porting the other 6 openings thats the time killer.
        sigpic
        99 Grand Am GT
        3400/3500 -Solid trans mount--TCE 65mm T-body---85mm LS2 maf---1 1/4' TCE intake spacers with 3400 upper--SLP Catback with flowmaster 80--TOG headers
        Modded 3400 lifters with LT1 springs---Comp Cams 26986 Springs
        1357 cam 227 233 .050 dur         515 515 lift 112 lsa
        15.232@88.85mph on stock 3400---New time to come

        Comment

        • #5
          Even better reason to use the 3500 upper... No runners just open up the thin openings. Takes no time at all!
          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

          • #6
            My interest for keeping the 3400 UIM is for the Throttle Body (no need of an adapter) and also for all the other modification need with the 3500 UIM. We cannot forget to mention that the 3500 UIM is very ugly, lol. Sorry for my english i'm from Québec, Canada.
            Last edited by Sleeper3400; 06-28-2009, 08:23 PM.
            Cavalier 1999
            3400 from an Alero
            Clutchmaster Stage 3
            Accel coils
            2.5" exhaust with only one Cherry Bomb Vortex
            Hybrid on the way

            Comment

            • #7
              Pretty doesn't win races, that ugly UIM is worth 5-10 HP and a much better RPM range over the 3400 one.

              a little black paint makes it look pretty decent, or if you have enough clearance you can use the plastic engine cover.
              Past Builds;
              1991 Z24, 3500/5 Spd. 275WHP/259WTQ 13.07@108 MPH
              1989 Camaro RS, ITB-3500/700R4. 263WHP/263WTQ 13.52@99.2 MPH
              Current Project;
              1972 Nova 12.73@105.7 MPH

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              • #8
                why not put in the whole 3500. thats wat im puttin in my 99 z24

                Comment

                • #9
                  i painted my ol 3500 uim primer grey and i think it looked tits but to each is their own and i would reccommend the complete 3500 if i were you and get some headers and im sure you'll crack 12s with ease on that 100 shot of noz
                  94 BerrettaZ26 3400,5 spd, aluminum flywheel, stg3+ spec clutch, poly mounts everywhere, strut and strut to rad braces, s&s headers, euro mirrors, and taillights, E36 headlights, blk widow spoiler, GTU rimz, intrax, KYB, OBD2 swap rear disk swap with ss lines and ss clutch line, addco rear bar

                  07 Chrysler 300 Base, with C frt bumper blk halo headlights and foglights. Coming soon tinted taillights and 22". The Family ride

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