Mrl 505

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MRL Performance

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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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OOF DA! Love the power curve,make a nice street motor.
 
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.
 
:coffee2:
66dartman said:
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.
Click to expand...


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
 
The Accel stuff is great stuff! Top notch guys to work with as well....
 
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.
 
: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!!
 
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.
 
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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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?
 
MRL Performance said:
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?
Click to expand...

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