Holley id help!
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Holley id help!

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    Senior Member jms-1's Avatar
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    Default Holley id help!

    i need some help figuring out what size carbs i have. i was told they were 750's but someone milled the choke towers off so i can't look up the numbers. what size diameter should the venturi and butterfly's be for a 750?

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    gn7
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    Quote Originally Posted by jms-1 View Post
    i need some help figuring out what size carbs i have. i was told they were 750's but someone milled the choke towers off so i can't look up the numbers. what size diameter should the venturi and butterfly's be for a 750?
    1 3/8 venturi with 1 11/16 throttle blades
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    Senior Member jms-1's Avatar
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    Thank you GN7

    the throttle blades are all 1 11/16 . the primary venturi is 1 3/8 but the secondary's are 1 1/2 .

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    Senior Member rpm0414's Avatar
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    The blade will have a 7 something number stamped on it. Means 750 cfm. If has 8 something number , 800-850 cfm carb. This is usually the case 99% of the time

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    gn7
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    Quote Originally Posted by jms-1 View Post
    Thank you GN7

    the throttle blades are all 1 11/16 . the primary venturi is 1 3/8 but the secondary's are 1 1/2 .
    I take it this is a 3310 vacuum secondary carb, not a double pumper. If it is a vac secondary, the secondary venturi is 1 7/16 not 1 1/2.
    LINK:GN-RACING.COM

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    Senior Member jms-1's Avatar
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    hear are some pics to help out
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    gn7
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    Its a 800
    LINK:GN-RACING.COM

    "there are too many pigs for the teats"
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    Senior Member jms-1's Avatar
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    ok, are they factory 800 cfm or did someone mix match them together? i'm just trying to make sure what i have.

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    Senior Member rpm0414's Avatar
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    It's a list 4780. Factory stock.

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    Senior Member jms-1's Avatar
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    Thanks for all the help!

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