how many 340's here will do 13's

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    Author Topic: how many 340's here will do 13's  (Read 8271 times)

    Offline mopower

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    Re: how many 340's here will do 13's
    « Reply #45 on: September 23, 2008 - 09:41:25 PM »
    oh yeah and 10 .7 to 1 com
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    Offline 71chally416

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    Re: how many 340's here will do 13's
    « Reply #46 on: September 23, 2008 - 09:58:57 PM »
    I think any mopar that has an upgraded motor should have an upgraded fuel system to go with it.  A 5/16" fuel line over the length of the car is too restrictive, and is just inadequate for a performance engine. That's what they use on Slant-6's. If you're using the hose too it's russian roulette. For every guy that's got away with it you'll find 10 that screwed their motors up when they went lean. Go to the racetrack when they have a division meet and look at what the stock eliminator cars have. You'll never find the stock fuel line on a Mopar. It'll be a 1/2" line with an electric pump with a relocated fuel exit on the bottom of the gas tank. And using a good electric pump makes good sense if for no other reason than just getting the fuel pump off the engine where it draws heat and heats up the fuel ("Vapor lock") It's also better to push the fuel from the back than pull it from the front. It also take some HP from the motor to operate it, just like a fan belt driven fan blade. For the $$ spent it's one of the best mods you can do. My :2cents:   
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    Offline 71chally416

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    Re: how many 340's here will do 13's
    « Reply #47 on: September 23, 2008 - 10:03:28 PM »
    Quote from: mopower on September 23, 2008 - 09:12:52 PM
    could someone tell me what they think my car will do in the 1/4..i have no track near me.. first the car is about 300 pds lighter than stock. ive dynod the car five times non stroked 340, it made 500 horse on motor 615 horse on nos 9 inch street slicks  391 gears 3 in exhuast ?? thanx

    FWHP or RWHP?
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    Offline mopower

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    Re: how many 340's here will do 13's
    « Reply #48 on: September 23, 2008 - 10:14:27 PM »
    challenger
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    Offline mopower

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    Re: how many 340's here will do 13's
    « Reply #49 on: September 23, 2008 - 10:15:41 PM »
    fw
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    Offline mopower

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    Re: how many 340's here will do 13's
    « Reply #50 on: September 23, 2008 - 10:22:05 PM »
    i thought it was over 400 hp to the ground but its been awhile
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    Offline 71chally416

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    Re: how many 340's here will do 13's
    « Reply #51 on: September 23, 2008 - 10:31:33 PM »
    Should do high 10's if it weights around 3350 and hooks up. 
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    Offline 71chally416

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    Re: how many 340's here will do 13's
    « Reply #52 on: September 23, 2008 - 10:39:29 PM »
    But you'll need more gear to get there and some good tires. :2thumbs:
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    Offline mopower

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    Re: how many 340's here will do 13's
    « Reply #53 on: September 23, 2008 - 10:47:15 PM »
    thanks for the imput appreciate it
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    Offline 440mike

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    Re: how many 340's here will do 13's
    « Reply #54 on: September 24, 2008 - 12:29:56 AM »
    the bosses 340 goes 12s,
    i'll ask him what alls done to it, but i know its got cast heads and solid cam, runs around on shell gas, no nos or anything.

    ok, i phoned him at home he said
    30 over 340
    10 to 1 forged
    holley intake and 750
    ported j heads and 202, hes the best.
    headers
    esky 255 degree solid cam 555 lift
    auto and 3800 stall trans
    456 gears and the slicks are 28 tall

    he said it dynos at 425 hp on the shell gas and goes 108 at 12.6 usually.

    i went for a ride last year in that thiung, holy crap it pulls
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    Offline 71chally416

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    Re: how many 340's here will do 13's
    « Reply #55 on: September 24, 2008 - 12:46:24 AM »
    What body is the motor in?
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    Offline mopower

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    Re: how many 340's here will do 13's
    « Reply #56 on: September 24, 2008 - 01:04:15 AM »
    i got edelbrock heads and the engine is a full roller  :clueless: i no it likes to eat corvettes  :bigsmile:
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    Offline mikerallye

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    Re: how many 340's here will do 13's
    « Reply #57 on: September 24, 2008 - 10:46:20 AM »
    Quote from: moper on September 23, 2008 - 09:17:21 PM
    Back to the original question... 340s are easy to get in the 13s. When the rest of the car is set up to hook and accelerate. My '74, that had a '68 340 stock longblock and a stick, with 3.23s, would run 13.80s without the juice. All due respect 71, no way you need all that improved fuel delivery for any system under 200hp. Retard the timng 2° for every 100hp rated, and drop the fuel pressure to 4psi, and I ran 9 series Champions in it with a Jacobs ignition. That's it. That car was fed by a factory 5/16 line, and AC Delco stock replacement fuel pump, and a $6 Purolator pressure regulator to drop the limne pressure from 5.5psi to 4. With the 175hp plate on it, it went 12.50s, and I never used it in 1st. All runs were with Sonic Turbos (lol old school) and Dunlop GT Qualifier Radials. That engine had a Comp 268H High Energy cam, and a stock Tquad and Tquad intake. I did tune the heck out of it. In any event, the 340 needs gear, and static compression, and then it wakes up. No reason why a pretty much stock long block 340 can't touch the 13s with headers, better tires, a modern cam, and a rear gear steeper than 3.55s. You would need a convertor too. 340s dont have the highest torque figures. They like to live above 3K. I used to side step the clutch at 3200, and shift at 6000. If the car is not numbers matching and there is money enough to do a performance rebuild on that 340, go to 416. It's not much more, and the result is the ultimate street smallblock.
    Yeah, Starting to lean toward the stroker setup  :burnout:
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