10.90's with a 340

Mopar General Discussions

  1. 345man

    345man mopar member

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    ok guys here is the question, i'm trying to figure out my next motor build. right now i have a 74 full weight duster with a 340, bored 30, stage 3 eddies, victor, 540- 549 solid, 9.7-8 to 1, street car that runs 11.60's spinning off the line. my question is what would it take to get a pump gas 340 to run 10.90's. thought about 12.5 to 1 and a solid roller, but there goes pump gas, don't know if that would get it anyhow. like to keep it good and streetable, if this option doesn't pan out there is the other option of a 11-1 stroker motor, i just like small cubic inches, thought this would be an interesting topic and maybe get a lot of ideas from it, all opinions and help will be greatly appeciated:blob:
     
  2. AdamR

    AdamR Big Member

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    Go with the stroker. The 340 will need tons of cam and RPM and will no longer be streetable.
     
  3. 340mopar

    340mopar Sorgermotorsports

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    Theres always laughing gas.


    Chuck
     
  4. zhandfull

    zhandfull Well-Known Member

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    A shot of Nitrous
     
  5. Thrashard340

    Thrashard340 Well-Known Member

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    ...or blower.
     
  6. 345man

    345man mopar member

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    got nos on it but would like to go 10.90's on motor then give it a shot of steriods:blob:
     
  7. GTXperience

    GTXperience Orig Stealth Mod

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    Full roller setup perhaps. What rocker gear/ratio are you running?
     
  8. 345man

    345man mopar member

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    have mopar performance 1.6 right now going to buy hughes 1.6's mid winter:blob:
     
  9. perfacar

    perfacar Well-Known Member

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    hi, if you're spinning tires now, with a bigger motor will be worse!! why not fix the suspension first, so the car will dead hook. chassis is ET, MPH is motor.
    get the car to 60' in very low 1.50 range or lower! tires and gear ratio will help a lot. just for thought, a 340 duster in stock elim, did hold the record @ 10.77 last year. those cars will 60' in 1.40's range.
     
  10. 345man

    345man mopar member

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    best 60 foot at another track was 1.53 the quarter mile track was mid to high 1.60's. going to go with a bigger tire next year, had 26-10.5 geared 4.10, next year same gear but either 27-10.5 or 28's:blob:
     
  11. dustertogo

    dustertogo Well-Known Member

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    Exactly! Don't get the cart before the horse. You need to get the car to hook as it is now and not try to fight that problem once you up horsepower. You'll at least be much closer to where you need to be.
     
  12. 345man

    345man mopar member

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    i figure when it hooks on next year year with new and bigger tires, comparing other timeslips from a different track it should go some 11.50's and if every thing was perfect on a run maybe 11.40's:blob: but in all honesty i don't see that happening. sorry to sound like a bench racer and what it should do
     
  13. Hotwheelsjr

    Hotwheelsjr Well-Known Member

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    I've had the pleasure of seeing this car run locally here in AZ -- Speedworld in Wittman, AZ to be exact. He's only teched to 10.0, but I watch him pull the wheels 12-15" off the ground and whip off a 9.90 -- he then slowed for the rest of the night so he wouldn't get kicked off the track...

    A streetable 340 punched out to 474ci. Full interior, leaf springs, torsion bars, and VALID Cali plates...un-freakin' real.

    1971 DODGE DEMON OWNER — RON SILVA ALTA LOMA, CALIF.

    Ron Silva knows a diamond-in-the-rough when he sees it. After all, how
    many people visualize a $550 1971 Dodge Demon ultimately doing the
    quarter mile in the 9s? Muscle car owners like to dream big, and Ron
    turned his into a fire-breathing, tire-smoking behemoth that is the terror
    of tracks up and down the West Coast.
    Silva began with the stock unibody construction, then added a number
    of enhancements from Mopar Performance. Chief among them were:
    • 340 R-3 ENGINE BLOCK
    • W9 ALUMINUM CYLINDER HEADS
    • AN ALUMINUM CARRIER MOUNTED INTO AN 8 3/4 REAR END HOUSING
    • MOPAR SUPER STOCK LEAF SPRINGS
    • MOPAR TORSION BARS
    To ratchet up the horsepower, the block was clearanced for the rods
    and stoker crank. Silva spent considerable time lightening the block
    with hand tools, in order to squeeze out another mph or two. The final
    under-the-hood product displaces 474 cubic inches and lays down a
    cool 700 hp.
    So how much of a demon is this Demon? Recently, at Mopars at
    the Strip in Las Vegas, the Demon turned a best time of 9.95 at
    133.69 mph. Astoundingly, this was accomplished with a full interior,
    a small block engine and tires that were only 11.5 inches wide.
    Plus, he had to slow down at the end in order to pass tech.
    How’s that grab ya?
     
  14. crackedback

    crackedback FABO Gold Member FABO Gold Member

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    Yeah, Ron's demon was a bad ass ride. He's building a valiant now!
     
  15. 1968FormulaS340

    1968FormulaS340 Well-Known Member

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    I was only able to pull off an 11.78 @ 118mph. Yup a bunch of cam (Crower solid roller) and a bunch of RPM (8000).

    Thats with ported stock heads and 11.7 compression.
     
  16. 416 scamp

    416 scamp Well-Known Member

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    I agree!! Stroke it!!
     
  17. 340srule

    340srule Guest

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    With that combination the demon should be running those numbers..

    Back to the original question,you want your 340 in the 10.90's you'll need more gear,more cam,and more compression.. personally i'd "stroke it"..my 416 with less cam and less gear runs consistent 11.0's and 60's in the high 1.40's,with nothing more then h.d. leaf springs,pinion snubber and cheap Summit drag shocks...
     
  18. 345man

    345man mopar member

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    what is everyones opinion on max compression and pump gas, everything im hearing is 10.5 to 1. any one running anything different with alumimun heads?:mrgreen:
     
  19. 340srule

    340srule Guest

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    I'm running 11 to 1 with my edelbrocks,it runs fine on 93 but i mix in 110 at the track she really likes that:mrgreen:
     
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