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53 Mercury won't run smooth at highway speed

Discussion in 'New to the H.A.M.B.? Introduce yourself here!' started by mrb4511, Feb 11, 2018.

  1. mrb4511
    Joined: Dec 31, 2013
    Posts: 1


    Hello everyone, I'm Michael and I may as well be a "New" member. Been a long while since I posted. I need your help now so here I am.

    I have a 1953 Mercury flathead V8 in a '49 Ford Coupe, that won't run smooth when trying a Steady speed. Fast or slow speed, the engine wants to surge or hesitate and not run smoothly. It's just started this and I have searched on this site to see if I could find an answer but NO.

    If you can help I'd appreciate that.
    Thanks a lot. Michael.

  2. ROADSTER1927
    Joined: Feb 14, 2009
    Posts: 2,921


    Put the choke on a little and see if it gets worse or better.
  3. k9racer
    Joined: Jan 20, 2003
    Posts: 3,091


    Welcome from North Alabama. I bet you have what is done on a lot of flat heads. Your timing is set to high. or your vacum advance is not working and some one added to much inital timing. Rember a FH is not a small block chevy.
  4. ol-nobull
    Joined: Oct 16, 2013
    Posts: 1,652


    Hi. Perhaps a vaccum leak. Just guessing. Jimmie

  5. Slopok
    Joined: Jan 30, 2012
    Posts: 2,670


    Check fuel flow & filter.

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