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Thread: Holley hp 750

  1. #1
    Join Date
    Apr 2010
    Location
    Delaware
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    14

    Default Holley hp 750

    i recently purchased a hp main body kit part #134-300c,iam using the base plate off my old 750 dp and im using the fuel bowls as well,the metering blocks are quick fuel billet blocks.For some reason i have a bog now when i mash the pedal to the floor then it picks back up,i have 31 squirters on the carb,and i tried 35's with no luck.any help appreciated.If you need more info on my motor combo i will be glad to provide

  2. #2
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    Nov 2009
    Location
    Kentucky
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    Default

    I do not know what the blocks you are using are calibrated for. They may not be set up properly for your application. It may be best to try your original metering blocks to see if this may cure your issue first.

    Make sure you have the mixture screws adjusted properly. It soulds like a accelerator pump issue. If you went to a 35 and it did not help, you can try to add a hollow screw to it. You can also try changing the pump cam to the #2 position. If this does not help, you may need a more aggresive pump cam or a larger squirter.

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  3. #3
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    Apr 2010
    Location
    Delaware
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    Should i use the hollow screws on the primary side or both primary and secondary?What will changing the cam to the #2 position do?Iam currently using a pink cam in the #1 position.

  4. #4
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    Dec 2009
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    Connecticut
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    Default

    http://www.youtube.com/watch?v=k2-RY...D7BFF0&index=8 (Holley Tech - "Accelerator Pump Cams" video)
    http://www.youtube.com/watch?v=eiRIfcrc2yA (or view it here)
    You can use the hollow pump discharge screws on both pumps.
    Also, ensure that the slightest movement of the throttle lever, results in actuation of the accelerator pump lever. That spring loaded screw may need adjustment.
    Last edited by Danny Cabral; 04-07-2010 at 07:27 PM.
    May God's grace bless you in the Lord Jesus Christ.
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  5. #5
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    Apr 2010
    Location
    Delaware
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    Default

    Quote Originally Posted by Jay M View Post
    I do not know what the blocks you are using are calibrated for. They may not be set up properly for your application. It may be best to try your original metering blocks to see if this may cure your issue first.

    Make sure you have the mixture screws adjusted properly. It soulds like a accelerator pump issue. If you went to a 35 and it did not help, you can try to add a hollow screw to it. You can also try changing the pump cam to the #2 position. If this does not help, you may need a more aggresive pump cam or a larger squirter.
    If iam using the pink cam now and wanted to go to the next aggresive cam which color would that be?

  6. #6
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    Apr 2010
    Location
    Delaware
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    Quote Originally Posted by BAD67 View Post
    If iam using the pink cam now and wanted to go to the next aggresive cam which color would that be?
    Holley techs any help appreciated.

  7. #7
    Join Date
    Mar 2010
    Posts
    23

  8. #8

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    I would try the black first, then the blue if black doesn't help. A word of caution, be SURE you have some (0.015 min.) clearance between lever & screw when throttle is held wide open. This is especially important with blue cam. I tore a diaphragm with the blue cam when I didn't do a thorough clearance check. THe blue cam give a lot of lift EARLY. The pink cam may give nearly the most lift, but it is spread out over the entire throttle rotation.


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