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Hybrid 3400 / 3900?

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  • #1

    Hybrid 3400 / 3900?

    I recently replaced a 3900 engine on an '06 Impala that was seized up. I thought I remembered reading about a 3400/3900 hybrid (3900 heads, intake, plenum [maybe exhaust manifolds?] on a 3400 block, IIRC). How's my memory doing? Will the parts bolt up to my '01 3400 Impala? Any *major* interference with the different front covers/power steering pumps, etc? Looks like it might take some "convincing" it to fit, I'm not afraid of a little grinding/welding/beating the hell out of it with a hammer if need be.

    I know I'll have to deal with the drive-by-wire and the return-less fuel system on the '06... and probably brackets, mounts, sensors, wiring, etc.; those won't be a problem. I'm just worried about whether or not the parts will bolt together using all (or at least most) of the bolt holes with no (or very little) gap between the parts.

    I have HP Tuners, so I can actually take advantage of what sure appear to be better flowing parts. What kind of power gain might I get by doing this swap? It's not going in a racecar by any means, but I figure I've got the parts for free... what's a gasket set and a weekend, right? And yeah, I'm totally kidding about the weekend, I've got another car to drive

    Thanks,
    Jason
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  • #2
    way better off just getting a 3900 and running that....
    "I am not what you so glibly call to be a civilized man. I have broken with society for reasons which I alone am able to appreciate. I am therefore not subject to it's stupid laws, and I ask you to never allude to them in my presence again."

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    • #3
      The 3900 combustion chambers would overhang the 3.4 OR the 3.5 bore IIRC. Plus the cooling system works a little differently.
      '89 Firebird, 3500 Turbo, T56, 9-bolt/4.11
      '86 Fiero, 3500, 4-speed

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      • #4
        Gen 4 heads are not compatible with Gen 3 blocks as already mentioned.
        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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        • #5
          You're thinking of the LX9 3500. The heads, lower intake manifold and upper intake manifold fit on the 3400. The 3500 heads require the 3500 lower intake manifold. The 3500 upper intake manifold uses a different throttle body, ignition coil pack mounting and some other stuff I can't really think of. You can retain the 3400 upper intake manifold to make things easier on you. It's best to do the full 3500 swap. There's a full guide made by HOYS from GrandAMGT.com here: http://dl.dropbox.com/u/534555/3500%...dy%20Swap.docx
          2000 Silvermist GL2 Sedan w/ LX9 3500 V6

          Current performance mods: TCE 65mm throttle body, ported 3400 upper intake manifold, ported 3500 lower intake manifold and heads, WOT-Tech Strip performance cam 276/264 adv duration .536"/.520" lift , COMP Cams 26915 Valve Springs, 28# Trailblazer Injectors, TOG headers, LS1 MAF, MMS Walbro 255 LPH Fuel Pump, Custom PCM tune and 4th Gen Camaro front calipers

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          • #6
            I seriously doubt the coolant holes will line up and them you have to figure out which gaskets to use Even if the spacing between the pistons will allow for it Good luck thou


            Sent from my iPhone using Tapatalk

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