486" dyno results

Discussion in 'Race 400/430/455' started by 71bskylarkk, Apr 19, 2021.

  1. 71bskylarkk

    71bskylarkk Vroom Vroom.

    Hello, just wanted to share the dyno video and results of my new set up.

    486" stock offset ground crank, molnar rods, diamond flat top pistons. Stock block with half fill, girdle, etc.

    Edelbrock heads lightly ported by me, TA 308S Solid roller cam, sp1 intake, with Holley super sniper stealth throttle body efi on top.

    12.7:1 compression ration fueled by E85.

    Made 493hp/463tq through a loose converter, th400, and full 3" exhaust with magnaflows.

    Next up to figure out is a vacuum pump on the engine while keeping my powersteering and alternator.

    Planning on daily driving it, racing it, and all that good stuff.


     
    Mike B in SC, 70 GMuscle and docgsx like this.
  2. BuickGSrules

    BuickGSrules Gold Level Contributor

    Close to 500 on the wheels is pretty good with the heads only lightly ported.
     
  3. 12.0 wagon

    12.0 wagon Grocerys optional

  4. bill dedrick

    bill dedrick Well-Known Member

    Do you have the dyno print out? At what rpm did peak HP occur? Peak Torque?
     
  5. pbr400

    pbr400 68GS400

    That’s nothin! The guy who won’t give details or timeslips (in cars for sale, with the 10 pin rear for hopping on the street) is making 600hp!!
    (Just kidding!! That’s awesome-sounds like a lot of fun!
    Patrick
     
  6. slimfromnz

    slimfromnz Kiwi Abroad

    Last time I was on a chassis dyno, I left dissapointed with the bloke operating it. Only made 604hp at the tyres when the engine made over 900hp. I was expecting to see 700hp at the tyres.
    So when I was trying to rack my brain as to why it didnt make the power, the operator limited the wheel speed to 140kph (86mph). So it turns out my 5400rpm stall converter made 600hp LOL.
    The rpms would go above 5500rpm in top gear. Engine makes max power at 6250rpm.
     
  7. hugger

    hugger Well-Known Member

    Those Win lite wheels look really good
     

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