400 at the track today

Discussion in 'Street/strip 400/430/455' started by Jeremy Zepnick, Apr 23, 2022.

  1. Jeremy Zepnick

    Jeremy Zepnick STEELMAN

    Took my 400 to the track. First pass was my best pass. 14.58 at 92mph.
     

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  2. Rikergs400

    Rikergs400 Well-Known Member

    Congratulation Jeremy, Great run!
     
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  3. Jeremy Zepnick

    Jeremy Zepnick STEELMAN

    Better than a handful of runs I did last year. Also was a .003 light!
     
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  4. Jeremy Zepnick

    Jeremy Zepnick STEELMAN

    462 motor that my dad and I are building will be put in probably end of May. His prediction is 11.80 with that motor. Def need to start thinking about the next step as to rear tires/suspension.
     
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  5. Jeremy Zepnick

    Jeremy Zepnick STEELMAN

    Burning those MT street tires
     

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  6. Rikergs400

    Rikergs400 Well-Known Member

    You plan on changing the 3:55 gear? Saw the picture of the new motor, looks sweet!
     
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  7. Jeremy Zepnick

    Jeremy Zepnick STEELMAN

    Gears are staying. New stall converter tho. TCI 3000. Needed for TA413 cam
     
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  8. Mark Demko

    Mark Demko Well-Known Member

    Good for you Jeremy!
    Run that thing and have FUN:cool:
     
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  9. Rikergs400

    Rikergs400 Well-Known Member

    Is the 400 the way you received it from me of have you changed anything?
     
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  10. Jeremy Zepnick

    Jeremy Zepnick STEELMAN

    Oh your Bob from Brussels? Lol didn't know that!

    I have not changed anything.
     
  11. Jim Weise

    Jim Weise EFI/DIS 482

    I don't mean to be a downer, but I think Dad might be a bit optimistic.. when you at the level he is now, you tend to forget how hard it was to get there.

    I recall how hard it was to get our 70GS into the 11's, and we had whole bunch more motor than you just built, plus 4.33 gears.

    You might want to temper your expectations.. I think Low 13's or high 12's might be more what your going to see. Especially if your 69 has highway gears.

    Just sayin...
     
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  12. Buicksky

    Buicksky Gold Level Contributor

    Good job ! You are on your way.
     
  13. Jeremy Zepnick

    Jeremy Zepnick STEELMAN

    Hey Jim, my dad had a 70 GS with the same gears and was an 11 second car. Full weight. Just saying. My dad knows what he is building and how to get in the 11s.
     
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  14. Jeremy Zepnick

    Jeremy Zepnick STEELMAN

    But I will take 12.70s over 14.50s. No matter what the motor comes out as.
     
  15. 436'd Skylark

    436'd Skylark Sweet Fancy Moses!!!!!

    So is this a mostly stock 400 and car? Its cool to see numbers on something besides a 455 or 350!
     
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  16. Jeremy Zepnick

    Jeremy Zepnick STEELMAN

    Yes stock 400 car. That's why when I pull this motor I'm keeping it. Rare motor. Will keep it just in case I want to sell car later in life
     
  17. Jeremy Zepnick

    Jeremy Zepnick STEELMAN

    Exhaust will change to. Headers and 2.5" exhaust with xpipe.
     
  18. Bens99gtp

    Bens99gtp Well-Known Member

    When I ran my brothers 68 gs 400, stk motor minus offy 360 intake and 750 edelbrock.....3.08 gears with m&h g60-15 tires it went upper 14.30s. It was faster than I thought it was going to be.

    Glad to see you out having fun with it
     
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  19. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    How fast the new motor makes the car will depend on how good the heads flow. Regardless, it will be faster than the 400, and you will have a blast. A certain amount of tuning will be necessary to get the best out of it. I remember what it took for me to go from 13's to the 11's. Whenever I got my time slip at the end of a run, I always thought to myself that the run felt faster than what the slip said. If you run 12's, that will be outstanding.
     
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  20. hugger

    hugger Well-Known Member

    There's always been those combos that do better than they should,....there have been more than a few guys take stock 70 shortblocks with stock heads and nice cam,..original hemi killer or something and manage high 11s,...it's not common by no means,....the vast majority of us don't get that lucky, ha,...I remember a fella years ago in GA had 73 shortblock with 430 heads,..small valve,..pretty healthy cam,..S divider intake and an damn edelbrock carb and the thing was running low 12s at 109mph,...made no sense to me ...but that's what it was,...certainly not typical tho.

    But your pop has always had great running combos so yours will follow suit I'm sure
     

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