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Technical More Help setting up a Holley 600

Discussion in 'Traditional Hot Rods' started by Al, Sep 25, 2020.

  1. Al
    Joined: Feb 12, 2005
    Posts: 556

    Al
    Member
    from Duluth, Mn

    I have turned the screws on both sides from the stop out 1 1/2 turns. I put the vacuum gauge on it and got it up to 16. Then started to stink again out the back. If I leave it at the 1 1/2 turns it runs better. When I put it in gear I have to keep tapping on the peddle to keep it running.I have a 1" insert under the carb with a gasket under, and above the insert. I just changed all of the plugs. It starts right away. It just does not want to idle well in park, nor in Drive with the Brake on. I have checked for leaks with the propane, and there was no increase in rpms. Running the vacuum gauge off the intake I get a steady 18 How can I get this set up?? Thanks..
     
    Sporty45 likes this.
  2. seb fontana
    Joined: Sep 1, 2005
    Posts: 6,600

    seb fontana
    Member
    from ct

    Cubic inch, cam, etc. Need more info.
     
  3. So is it 16 or 18? Adjust the idle mixture screws for the most inches of vacuum.

    If it won't idle, then look at the timing or adjust the idle speed adjustment screw.
     
  4. Jalopy Joker
    Joined: Sep 3, 2006
    Posts: 25,272

    Jalopy Joker
    Member

    condition of carb? - post pic of motor
     

  5. Dirty air bleeds? Rear throttle plates open too far? Low timing?
     
  6. redo32
    Joined: Jul 16, 2008
    Posts: 1,731

    redo32
    Member

    In your other post that got locked you said it stinks up the garage. I'd check the float levels and maybe excessive fuel pressure.
     
    gotta56forme likes this.
  7. beater32
    Joined: Mar 23, 2008
    Posts: 345

    beater32
    Member

  8. after spending a good part of yesterday watching youtube vids on carb set-up, tuning & trouble-shooting a very common theme in almost all of them was measuring and making sure your fuel pressure was to carb specs. A number of vids said the same thing - if your fuel pressure isn't right, it messes with all the carb circuits.
     
    Truck64 and X38 like this.
  9. Al
    Joined: Feb 12, 2005
    Posts: 556

    Al
    Member
    from Duluth, Mn

    Chevy 350. Don't know cam size..
     
  10. Al
    Joined: Feb 12, 2005
    Posts: 556

    Al
    Member
    from Duluth, Mn

    Holley told me that if you have a mechanical pump. They are low pressure, and I DO'T need a fuel pressure gauge..
     
  11. Al
    Joined: Feb 12, 2005
    Posts: 556

    Al
    Member
    from Duluth, Mn

    Carb is new. Bought it last year. If I adjust it up to 18 it smokes and stinks. If I lower it to the turn and a half it doesn't smoke or stink..
     
  12. Al
    Joined: Feb 12, 2005
    Posts: 556

    Al
    Member
    from Duluth, Mn

    Want more pictures of the motor??
     

    Attached Files:

  13. Deuces
    Joined: Nov 3, 2009
    Posts: 18,709

    Deuces
    Member
    from Michigan

    I rebuilt a List-1850-2 600 Holley and had the motor (Ford 302) idling @350 rpm and pulling 22-23 inches of vacuum.... I still have that carb... ;)
     
  14. Andy
    Joined: Nov 17, 2002
    Posts: 4,622

    Andy
    Member

    Don’t Holly idle mixture screws work backwards? In is richer? I am a WCFB and AFB man so have extremely little knowledge of the Holly carbs.
     
    Lloyd's paint & glass likes this.
  15. Put a fuel pressure reg on it and set it @ 5 lbs. Had a holley pump was puttin out 10 lbs.
     
    rbrewer and X38 like this.
  16. 6sally6
    Joined: Feb 16, 2014
    Posts: 1,261

    6sally6
    Member

    Timing....timing...timing... Tell us about your timing curve. initial....total and @ what RPM. It all works together. With enough info we should be able to "fix-it"
    6sally6
     
  17. Mike Colemire
    Joined: May 18, 2013
    Posts: 1,235

    Mike Colemire
    Member

    Some of the manual pumps, several Carters I've seen, can put out 7.5 psi. Make sure the primary throttle blades aren't letting to much of the transition slot to be exposed, it'll pull extra fuel in at idle and make it rich.
     
    X38 likes this.
  18. gimpyshotrods
    Joined: May 20, 2009
    Posts: 17,647

    gimpyshotrods
    ALLIANCE MEMBER

    It sound to me like the ignition timing is off.
     
    Truckdoctor Andy likes this.
  19. I've had to put a regulator after a mechanical pump. It's cheap and easy to check the pressure. Mine showed nearly 8lbs before I installed a reg...carb issues solved.
     
    rbrewer likes this.
  20. Al
    Joined: Feb 12, 2005
    Posts: 556

    Al
    Member
    from Duluth, Mn

    So what is a good brand to put on?? I saw a Mr Gasket, or should I get one from Summit Racing??
     
  21. Al
    Joined: Feb 12, 2005
    Posts: 556

    Al
    Member
    from Duluth, Mn

    As far as the rest of it goes. I really don't know much about carbruators, or timming. I'll have to watch a few more videos on youtube.
     
  22. jaw22w
    Joined: Mar 2, 2013
    Posts: 1,064

    jaw22w
    Member
    from Indiana

    Most carb problems can be fixed at the distributor.
     
    gimpyshotrods likes this.
  23. Truck64
    Joined: Oct 18, 2015
    Posts: 4,142

    Truck64
    Member
    from Ioway

    They are supposed to be low pressure. Lots of defective shit out there these days. Have you actually measured the output pressure? Your vacuum gauge does this too! Don't guess, measure. For most carburetor a static pressure of 5 psi is plenty. More is not better. Then when you've verified that, set the float height carefully. Ever notice the fuel height is spec'd +/- a 32nd in.?

    A lot of "carburetor problems" though are often ignition timing related, or other engine defects, 16" is a tell, that's too low for Minnesota unless maybe you've a performance camshaft. A high steady manifold vacuum is pretty important for a carburetor to work right on a stock or street driven engine. The carb circuits utilize manifold vacuum particularly for smooth idle and a crisp, just off idle acceleration, up to about 35 mph where a lot of driving is done.

    If compression is acceptable and the engine not too lunched overall it should pull 19" to 21" at factory idle and ignition timing settings. If it doesn't, find out why, because you'll pull your hair out dinking around with the carburetor and it will never run quite right..
     
    gimpyshotrods likes this.
  24. Lloyd's paint & glass
    Joined: Nov 16, 2019
    Posts: 2,707

    Lloyd's paint & glass
    ALLIANCE MEMBER

    Still putting my money on the power valve. I've always had your same issue with Holley carbs, to the point that i switched to edelbrock. If you turn the mixture screws all the way in and it dies, the power valve isn't blown, but it's still more than likely opening up at idle. You can buy a set of different sizes cheap ($35) and switch them out until you find the one your engine wants. Here's a good read on it...

    https://www.holley.com/blog/post/holley_power_valve_tuning/
     
    Deuces likes this.
  25. ekimneirbo
    Joined: Apr 29, 2017
    Posts: 1,451

    ekimneirbo
    Member
    from Brooks Ky

    On your other thread you talked about "vacuum", so here are some exerpts from a book that should help you insure that vacuum is not the root culprit. Anyone working on some of the older engines and doesn't have much experience might want to chase down a copy of one of these books. They are basically the same, and Ebay currently has several available for about $5/$10.
    Troubleshooting 1 001.jpg
    Troubleshooting 2 001.jpg
    Vacuum Guage 1 001.jpg
    Vacuum Guage 2 001.jpg
    Vacuum Guage 3 001.jpg
     
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  26. Al
    Joined: Feb 12, 2005
    Posts: 556

    Al
    Member
    from Duluth, Mn

    Thanks. I will look for the book, and read. I stopped by a make shift car show, and was talking with a guy with Twin Holley 600's on a tunnel ram. He also said probably wasn't the carb. He said because I have never taken it out on the road, and driven it, and it has kind of a rough idle that it might be a sticky valve. Told me to get a bottle of Marvel oil. Drop have in the oil, and the other half in the gas. Said it won't hurt anything, and may help it. At least it will take care of any sticky valve issues. I put in a bottle in. I ran it for about a minute, and let it sit. Then I went out about 20 minutes later. Started it up. It smoked a little, but seemed to run smoother. Still has a rough sound with it, but it does have a cam in it. The engine came from a Circle Track Racer.. It was rebuilt. Put into a pickup truck, then it came with the car when I bought it. I can't take the car out to drive it yet, because I have the front up on blocks because I am waiting for a new power steering hose. After that I Will take it out and see how it handles..
     

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