1. MRL Performance

    MRL Performance Well-Known Member

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    Here is our latest and greatest Big Block

    505 from 440

    4.25 stroke 4.350 bore
    Eddy Victor Heads ported
    Eddy Victor intake ported
    Hughes 1.6 rockers
    Lunati Voodoo solid roller 255/263 @.050"
    Milodon oil system
    Aluminum main caps with girdle
    Accel DFI EFI system
    10.3 to 1 compression

    648HP@6000-6250
    643TQ@4800-4900

    Torque? You want some torque? How about 600+ from 3700-5600rpm!

    Horse Power? You want horse power? How about 600+ from 4900-6900rpm!

    Idles at 950rpm w/10inches of vacuum, wicked throttle response.
     

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  2. Abodybomber

    Abodybomber Breaking street machines , since 1983.....:) Legendary Member

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    OOF DA! Love the power curve,make a nice street motor.
     
  3. dartcuda1

    dartcuda1 67 Barracuda 500ci 6sp FABO Gold Member

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    I like that efi setup.Can you tell us about it.
     
  4. 66dartman

    66dartman Well-Known Member

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    Awesome. I too would like to know about the accel efi setup, price, ease of setup, etc.
    Great numbers, would make a great torquer for a heavy street car.
     
  5. famous bob

    famous bob mopar misfit

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    :coffee2:

    interested in the fuel injection also.
    going to put my 505 in my 68 barracuda that`s on a little diet; hoping for 3400 or less w/ my 210 in it. your engine is identical to mine w/ exception of heads-yours should a little better than mine-mind me asking what the flow rates are on yours?

    505" fish
    thanks, bob
     
  6. ou812

    ou812 Well-Known Member

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    The Accel stuff is great stuff! Top notch guys to work with as well....
     
  7. MRL Performance

    MRL Performance Well-Known Member

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    DFI is a good system and has a ton of adaptability. Price depends on options.

    We used it last year to get 650hp out of a 416 running E85.

    From what I have found using EFI, you dont always make more peak power, but the average power is almost always better.
     
  8. notenoughcash

    notenoughcash Well-Known Member

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    :prayer: :cheers: :cheers:

    Ahh yeah! That's mine :) Going into my '74 Swinger. I gotta update build thread soon, finally getting some body work done (I don't do that part, not even badly)

    Putting either a T56 or Passons new 5 speed behind it :burnout::burnout:

    I'll end up being a majority stock holder in some tire company with this thing!

    Thanks Mike!!
     
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    • MRL Performance

      MRL Performance Well-Known Member

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      Man, I can not even imagine this 650/650(basically) hp/tq engine, in a Dart w/5-6 speed manual. Cricky, that should be fun!

      Your welcome James, it was fun to build.
       
    • 805moparkid

      805moparkid SS And AFX Worker Bee

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      drool! i have the same basic motor just with a baby cam in it right now (.564 lift solid flat comp cams something)... will be the baddest motor ive built/run so im starting easy!

      i to have the victor heads, did you do the Max wedge ports? clean up or what??
       

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    • MRL Performance

      MRL Performance Well-Known Member

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      They are std port, fully ported. I wanted a strong torque curve so I went with the smaller port. I did have to port the intake, as the Victor std port intake is a bit restrictive. We gained almost 50hp from the intake work.

      Did you do any work on the heads/intake?
       
    • 805moparkid

      805moparkid SS And AFX Worker Bee

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      to be honest i just did clean up on the heads, not even blending lol... just painted in the intake...

      being i was maybe 16 when i built it i was a little nervous about eeking out any more power but wanted to have room to grow...

      good to know on the intake!

      what rocker ars did you go with?? i was looking at the muscle motors stuff back when i was getting ready to buy but never did...
       
    • MRL Performance

      MRL Performance Well-Known Member

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      I use the Hughes rocker kit. It needs a little tweaking, but once you get it they are spot on.
       
    • 805moparkid

      805moparkid SS And AFX Worker Bee

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      what do you mean like shimming? centering the tips?
       
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