340 block based 418

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    Author Topic: 340 block based 418  (Read 14393 times)

    Offline moper

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    340 block based 418
    « on: August 17, 2006 - 01:30:37 PM »
    This is one for the street crowd. 418 cu inch
    '73 340 block .040 over
    MP cast 4" crank, 340 mains
    Eagle H beam rods, 6.123 long
    Ross forged dished pistons
    Edelbrock RPM heads, mild port cleanup, gasket match
    MP roller rockers, 1.5 ratio
    MP dist.
    1 5/8 headers
    Edelbrock Performer intake (not rpm...)
    Holley 3310
    Shortblock just basic good machining. ARP main studs, line bore, plate honed, sq decked, etc. Internally balanced, block notched for rod bolt clearance (needed on every rod type I know of..), block deburred. Assembled at a true 10.8:1. Runs a Solid cam from Scott Brown, roughly .530 lift, 229° @ .050. (small cam...)
    Chassis dyno results were 378hp @ 5500, 409tq @ 3100.
    Correcting that's 446hp, 482tq at the flywheel.
    It runs on 92 pump fuel, idles at 800rpm, and pulls 13" of vaccum in drive, and never gets hotter than 185 with a 22" brass 3 core radiator.
    The long block could be duplicated for $5900
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    Offline matt63

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    Re: 340 block based 418
    « Reply #1 on: November 10, 2006 - 08:10:25 AM »
    Very interesting.  This combo is very similar to mine except that I have a hydraulic roller cam with the same duration but more lift and the Eddy rpm manifold.  I have the Eddy magnum heads, I beam rods and forged crank although these won't change the engine output figures! Unfortunately I have not had it dyno'd.  Compression, vacuum,etc is about the same too.  Hughes Engines estimated 460 HP+ based on this combo with the hydraulic roller cam.  The engine is makes the Cuda alot of fun to drive.

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    Matt in Edmonton

    '68 Valiant
    '73 Cuda 340 4 speed (408) SOLD

    Offline ViperMan

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    Re: 340 block based 418
    « Reply #2 on: April 18, 2007 - 04:27:38 PM »
    That's interesting...

    So just how hard is it to come by a decent 340 block?

    And my apologies for renewing a 120-day old post - I'm new here...

    Jeff
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    Offline Chryco Psycho

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    Re: 340 block based 418
    « Reply #3 on: April 19, 2007 - 12:57:57 AM »
    Avaiable new from Mopar in std or R3 casting
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    Offline ViperMan

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    Re: 340 block based 418
    « Reply #4 on: April 19, 2007 - 03:16:02 PM »
    Yeup, I've GOTTA subscribe to that Mopar magazine...

    I love this board...     :worshippy
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    Offline moper

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    Re: 340 block based 418
    « Reply #5 on: April 25, 2007 - 06:47:26 AM »
    Well, a stock blockj you need to pay for, and have sonic tested to see what you can do with it. However, that's true regardless of 340, 360, or 318. If you plan to go bigger stroke, you need to find out if the block will live that way. In many cases, sleeving one or two holes, plus paying for a GOOD sonic test that provides usable results will cost a bit less than the new Mopar blocks. In some cases with them, the old factory castings are thicker where it counts. Regardless of what Mopar says. Any 340 block is a good starting spot, but if you need a larger oversize like .040 or .060 over, those pistons are more $$. I've recently agreed to buy std bore blocks at $400, becuase they are getting harder to find. Lots of .030 overs, but if they are rusty, or tapered, and pass sonic, then they will need the pricier pistons.
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    Offline 440mike

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    Re: 340 block based 418
    « Reply #6 on: July 01, 2007 - 10:25:12 PM »
    Saw this on another site, looks like a tough Smallblock, you guys believe this ?
    Check the dyno sheet on the last page ?
    WOW !
    http://www.dodgecharger.com/forum/index.php/topic,26383.0.html

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    Offline Oldschool

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    Re: 340 block based 418
    « Reply #7 on: July 03, 2007 - 02:11:16 PM »
    Quote from: 440mike on July 01, 2007 - 10:25:12 PM
    Saw this on another site, looks like a tough Smallblock, you guys believe this ?
    Check the dyno sheet on the last page ?
    WOW !
    http://www.dodgecharger.com/forum/index.php/topic,26383.0.html






    I'll withhold judging this combo until the dyno sheets are posted.  It's been 3 weeks since he made that claim and still no actual dyno chart posted.  We shall see I guess.....
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    Ken  --  In Georgia

    MOPAR-------"Built To Run------Here To Stay"

    Offline 422STROKER

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    Re: 340 block based 418
    « Reply #8 on: July 03, 2007 - 06:11:03 PM »
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    Tom
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    Offline 440mike

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    Re: 340 block based 418
    « Reply #9 on: July 09, 2007 - 08:08:12 PM »
    521 H.P. & 520 ft/lbs Torque,  the dyno sheet is up here;

    Whats the verdict ? Can smallblocks really make that much on pump gasoline  ?

    http://www.dodgecharger.com/forum/index.php?PHPSESSID=618f5429d51f43603f1e8a9f993bc1c9&topic=26383.30
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    Offline go-fish

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    Re: 340 block based 418
    « Reply #10 on: July 09, 2007 - 08:37:42 PM »
    Of coarse a SB can make that kina power. The real questions are what does 1lb cost in HP and how much less than a BB does a SB weigh? Add a centrifugal supercharger to the mix and WHOA!
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    Offline go-fish

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    Re: 340 block based 418
    « Reply #11 on: July 09, 2007 - 08:47:09 PM »
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    Offline 440mike

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    Re: 340 block based 418
    « Reply #12 on: July 15, 2007 - 10:35:52 AM »
    WOW !
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    Offline GoodysGotaCuda

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    Re: 340 block based 418
    « Reply #13 on: July 15, 2007 - 03:04:45 PM »
    How 'bout this 408 on pump gas. . . . Turbo  :bigsmile: :faint:

    Quote
    I'm at 408ci and trying to squeeze 20+ lbs of boost out of her..made 801rwhp at 20psi last dyno trip..
    408ci
    8.5 to 1
    245/245 565lift solid flat tappet
    edelbrock heads probably flow around 270 at 550lift
    weld-el manifolds
    twin master power t-61's with 1.1.5 ar p-trims
    dual 3" downpipes with full dual 3" exhaust
    727 automatic
    6400rpm max...floats at 20psi ( I know, I need some more seat pressure)


    Well made about the same power with the housings but boost was definetly slower...did though crank up the boost to 25 psi and put down 895whp at 6000rpm..

    Car was loaded on trailer so decided to head off to the track...turned the boost back down to 20-21 psi and ran 5.80 at 124! [1/8]..but the boost came on more gradual and smooth...hooked up no problem now..just on 295/65/15 M/T street radials with stock leafs and traction bars..
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    Offline moper

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    Re: 340 block based 418
    « Reply #14 on: July 19, 2007 - 10:12:03 AM »
    Boost doesnt count Goody... :bigsmile:

    With thte right cam and enough head, they make some killer power alright. Keep in mind, the one I listed barely has .500 lift after lash.
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