484 purple cam..JUNK

Mopar Performance Issues

  1. goldmember

    goldmember Well-Known Member

    Messages:
    349
    Likes Received:
    9
    Joined:
    Aug 13, 2004
    Local Time:
    11:33 PM
     
  2. wanta68cuda

    wanta68cuda Well-Known Member

    Messages:
    528
    Likes Received:
    91
    Joined:
    Jan 30, 2008
    Location:
    Cartersville,Ga
    Local Time:
    6:33 PM
    I had a similar problem with mine. We had to change the springs in my distributor to re-curve it and it fixed the problem. It might work for you.
     
  3. T67POWER

    T67POWER Well-Known Member

    Messages:
    669
    Likes Received:
    5
    Joined:
    Sep 30, 2009
    Local Time:
    6:33 PM
    It's the power valve.
    The carb is your whole problem.
    Run 71/81 jets with the rear power valve blocked off.
    timing at 38 total.......unhook your vacuum advance.

    If you have to turn the idle screws out more then a turn and a half then the idle circuit is to lean------a common problem with a cheap carb.


    If i put my 750 holley hp on that 340, your plugs would look like they where run in a fuel in injection engine they burn so clean.

    That cam is a great cam by the way.

    There is a trend --- as of the last 10 years or so --of over estimating a cams ability to make more power then the next grind.

    When your in the right ball park as far as your cam choice -- not to big or small moving to a bigger or smaller cam isn't really the problem solver you would think it is.
    --the rest of the car is what makes your car faster then the next guy.
     
  4. SGBARRACUDA

    SGBARRACUDA ROY FABO Gold Member

    Messages:
    21,435
    Likes Received:
    9935
    Joined:
    Dec 7, 2006
    Location:
    PLANT CITY FL. and PERRY GA.
    Local Time:
    6:33 PM
    I ran the 484 cam in my 70 340 4sd. Duster. Installed it at 104 ran a Mallory unilite that was 20 degrees in at 2000 rpm and initial @ 18 . LD-340 intake 700 DP 3.91 gears. Performed very well and I never had to retune. Just had to keep replacing the rear tires!
     
  5. Dartnut

    Dartnut Don't hate me because i'm beautiful

    Messages:
    11,726
    Likes Received:
    4762
    Joined:
    Apr 19, 2007
    Location:
    Southern Alberta
    Local Time:
    4:33 PM
    I have that cam in my low comp 360 in my Dart Sport which is stock other than the cam, weiand dual plane intake, and a 600 edelbrock avs carb. Everything else is stock including exhaust and it runs well and is very driveable with 3:55 gears and a 4 speed. The initial timing is set as high as the starter will allow, and it is a good driver that sounds good and is very smooth. It runs at 180 degrees all day in the heat.
    It's not all that powerful, but not bad for a low comp 360.
    Advancing the timing made a huge difference on how it performs. After you get your initial carb settings done, timing is the first place i would start.
     
  6. longarm

    longarm Car sold back to original owners

    Messages:
    2,867
    Likes Received:
    87
    Joined:
    Feb 10, 2006
    Location:
    central ohio
    Local Time:
    6:33 PM
    Might check the fuel pressure at idle and higher rpm,
    haven't seen that mentioned.
     
  1. This site uses cookies to help personalize content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.