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Anyone hear of the 3.4dohc having 275hp originally?

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  • Anyone hear of the 3.4dohc having 275hp originally?

    I saw something written on the internet about the 3.4dohc having 275 hp when it was first designed but was taken to 200hp by cutting the fuel delivery and spark advance curves because of tranmission warranty problems does anyone know if this was true?

  • #2
    Maybe it did, but it wasn't released that way and it certainly didnt have that much power with all the parts that it was released with. The site you read this shit from used to have even more crap on it it, and still has quite a few lies. No, the computer alone wont give you ungodly amounts of power. No, the exhaust valves aren't filled with sodium. No, the stock exhaust manifolds are not defying the laws of common sense and somehow NOT restricting the exhaust gases.

    Who knows what GM originally had designed this motor to have, with different cams, heads, pistons, intake manifolds, exhaust manifolds/headers, and then....tuned for all those parts.
    Ben
    60DegreeV6.com
    WOT-Tech.com

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    • #3
      This question is almost as common as "Will the L67 drop right in....."
      Brian

      '95 Cutlass Supreme- "The Rig"
      3400 SFI V6, 4T60e
      Comp Cam grind, LS6 valve springs, OBD2 swap, Tuned
      2.5" DP/ 2.5" dual exh/ Magnaflow Cat/ crap mufflers/ 3500 Intake manifold/ 65mm TB
      TGP steering Rack/ 34mm Sway Bar/Vert STB/ KYB GR2's

      '08 Chevy Trailblazer SWB 1LT "Smart Package"- LH6 5.3L V8/4L60e, A4WD

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      • #4
        yeah that was a relly hyped up version of the 3.4 never released
        probably GM just trying to see what was possible
        I Like V660s
        Does Chevy make beer
        ~Jayme~

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        • #5
          Just like the original Turbo 3.1 was 305hp, not 205. The test engines are always more powerful than the ones they release.

          Shawn
          90 Grand Prix STE 3.1 Intercooled Turbo-3100 Hybrid
          K&N, Magnaflows, No Cat, Chip, FFP Pulley, H260 Cam, No EGR.
          99 Grand Prix GT
          K&N|No Cat/ubend/res|160 tstat|shift kit|UD ALT & WP Pulleys|XP Cam|Stage 2 I/C|Pacesetters|MPS|2.9"|Custom PCM
          12.665 @ 110.44 w/2.018 60', STREET TIRES, PUMP GAS!

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          • #6
            Lol that sounds exactly like the site i saw. Just wondering if it was true i guess it isn't

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            • #7
              It may have been true. There have been Desktop Dyno runs with defferent cam specs, and using the "Official" GM specs I think there was an enormous gain. You'd have to dig up the thread. I'm sure they didn't release this because of reliability reasons.

              Or maybe they didn't want FWD "family" cars smoking the Camaros and Corvettes of the day.
              --Rob
              Currently attending Wyotech, Fremont, CA. Start Date: 1.24.05. Grad. Date: 4.21.06
              1992 Chevy Lumina Z34 5 Speed FOR SALE $1400 AS IS RUNS WELL

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              • #8
                The official cam specs were wrong. GM decided to rate the duration at .2...or something like that. I corrected the site page with the specs months ago.
                Ben
                60DegreeV6.com
                WOT-Tech.com

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                • #9
                  thats kinda like the quad 4 that they tuned the shit out of and got like 1000hp out of it
                  im sure that badboy didnt last more than a couple of minutes
                  I Like V660s
                  Does Chevy make beer
                  ~Jayme~

                  Comment


                  • #10
                    i dunno i can easily see 280 hp out of these motors. Im not saying they did or didn't, but its very possible... and it damn well should be...

                    its a 4 cam 24 valve 6 cylinder 207 CI monster. 210hp seems pretty low, if it was a 12V pushrod it could probably be making around 210 quite easily.

                    I personally believe there is an unbelieveable amount of untapped power in these bad boys, im going to take it to a tuning shop here in town that specializes in imports and see what they can do. Since the domestic shops are like "DOHC, ya they make pretty good exhaust". (the import shop has also done several 32V northstar swaps... into old golfs)

                    I have some old magazines that did previews for the Z34... and they talk about the "throaty 4 pipe exhaust" and "mustang smoking power... in a v6"...

                    this is coming out of the magazines that didn't get picked up by ford, chevy or chrysler (such as motortrend and car and driver, which are sickeningly biased)... which is why they're no longer around.
                    2001 Mustang GT
                    1991 5spd Lumina Z34 - Dead
                    1947 4spd International - Dead... Reincarnation pending.. getting close now .

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                    • #11
                      You are right, and there is untapped power.

                      IMO, and proved by a dyno sheet, it can be achieved easily with a better intake manifold, headers, and cams. Not to mention what head work, higher compression, borexstroke, etc would do to it.

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                      • #12
                        Speaking of untapped power and what-not. I'm going to be needing to rebuild my engine within the next year. For boring over, I've heard .020 is fine. What kind of power gains are we talking about with any sort of boring over? I also want to deck the heads, but I forget what is safe without causing the engine to become interference.

                        Also, since I am boring it over, I would like to destroke slightly, to raise max RPM and cut down slightly on mass with shorter connecting rods. All of this will (obviously) have to be custom made, which I can probably find someone to do. What is the PROPER way to destroke? And is this even worth it? I know there is an optimal bore:stroke ratio.
                        --Rob
                        Currently attending Wyotech, Fremont, CA. Start Date: 1.24.05. Grad. Date: 4.21.06
                        1992 Chevy Lumina Z34 5 Speed FOR SALE $1400 AS IS RUNS WELL

                        Comment


                        • #13
                          Well you aren't going to gain much from a .020 over bore. That is a pretty small bore, basically it is good for cleaning the cylinder walls. As for the stroke, you can use a 2.8L crank, it had a lower stroke than the 3.1/3100/3.4 TDC/3400. But why not keep the stroke up? The 3.4 already can hit 7k without problems, and its been proven that it can hit 7600 with a new intake manifold, and mine will be hitting 8. And these are all on stock stroke, maybe higher. The weight gains you'll notice by shortening stroke will not be worth the power loss.

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                          • #14
                            I was just looking at the chart, it says .060 is the most you can do safely.

                            Would it even be worth it to bore that much? After the cost of pistons, rings, etc. I don't think it would be.
                            --Rob
                            Currently attending Wyotech, Fremont, CA. Start Date: 1.24.05. Grad. Date: 4.21.06
                            1992 Chevy Lumina Z34 5 Speed FOR SALE $1400 AS IS RUNS WELL

                            Comment


                            • #15
                              Well I am using Wiseco for my pistons, and the price is nearly the same if I go stock, 20, 30, or 60 over. There is like a $10 difference per piece from stock to .060 over. And since my rings are going to be custom Total Seals anyway, the price is also nearly the same. True its $5 here, 5 there, but all in all a .060 bore makes up for $100 extra.

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