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Customs Chevy 235 Money Pit HELP!

Discussion in 'The Hokey Ass Message Board' started by 51fordor, Sep 24, 2014.

  1. 51fordor
    Joined: Sep 16, 2010
    Posts: 215

    51fordor
    Member

    I purchased my 54 last August in the western part of NC. I drove it home to the coast and it ran fine for the most part. The car did develop a small hiccup/misfire/sputter while cruising as I progressed home. The car starts up easy, accelerates like a cat with it's tail on fire, keeps low temps and clean oil. When under a load of acceleration the car runs flawless. As soon as I back off and start cruising along at a speed around 50 there develops a random sputter. It is very subtle but it is driving me nuts because I know how good it can run. I have installed a new HEI Distributor, new plugs, new wires, new grounds, rebuilt the carb, and rewired the entire car throughout the last year. The problem has gotten no better. I was thinking maybe since the car was in the mountain/piedmont region of NC it's entire life maybe it was jetted for elevation. The carb has a #56 Jet in it so I don't know if thats my issue. I do know the heat exchange valve thingy on the manifold is seized open. I doubt that matters but worth mentioning. The only thing I am yet to do is a valve job and replace manifold gaskets....Thanks in advance for any help you can offer guys!
     

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  2. oldsman41
    Joined: Jun 25, 2010
    Posts: 1,369

    oldsman41
    Member

    not exactly sure but you might have a valve hanging up. run a tankful of gas with marvel mistery oil in it 4oz to 10 gal it says on bottle might help clear it up. you can also add some to your oil i do about two hundred miles before each oil change. i know this crappy gas they sell doesnt help either but we have to live with that.
     
  3. JohnEvans
    Joined: Apr 13, 2008
    Posts: 4,883

    JohnEvans
    Member
    from Phoenix AZ

    As I recall a 61 or 62 main set was stock. Sold my 54 about 50 years ago. Also leaky manifold to head could cause your problem.
     
  4. 302GMC
    Joined: Dec 15, 2005
    Posts: 6,901

    302GMC
    Member
    from Idaho

    Manifold gaskets, tight valves, power valve leaking thru in carb, cracked insulator under carb ...
     

  5. APACHE FS
    Joined: Feb 20, 2007
    Posts: 569

    APACHE FS
    Member

    ^^Check this stuff, I had cracked insulator under carb and it did a lot of strange things.


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  6. 51fordor
    Joined: Sep 16, 2010
    Posts: 215

    51fordor
    Member

    Did a valve job today. . Every single valve was way to tight. Guess the previous owner didn't know how to adjust them. Exhaust is 018" & intake is 006" now. Idles way smoother and runs perfect now. Night and day. Thanks guys for all the input.

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