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Old 03-30-2013, 08:54 AM
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holley vacuum secondary speed screw

Hello guys I have just a basic question. I have a holley 600 vacuum secondary and I want to replace the secondary throttle plate speed screw with an Allen type screw for easier adjustment. Can anyone tell me the size of this screw. Thanks Eric

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Old 03-31-2013, 12:35 AM
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Quote:
Originally Posted by eric32 View Post
Hello guys I have just a basic question. I have a holley 600 vacuum secondary and I want to replace the secondary throttle plate speed screw with an Allen type screw for easier adjustment. Can anyone tell me the size of this screw. Thanks Eric
Not an answer to the thread size, but simply removing and reversing the original screw allows adjustment w/a slotted screwdriver from the top side.
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