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Old 06-23-2013, 07:27 PM   #1
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Carter BBD choke flap screw size?

Does anyone have a manual that tells the size for the choke flap screws on the Carter BBD? I have gone to the hardware store and auto parts store with no luck. The 6-32 is too big and the 4 feels too small. Thanks for any help.

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Old 06-23-2013, 08:21 PM   #2
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Where the needle is pointing.

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Old 06-24-2013, 01:42 PM   #3
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I don't know what the correct size is, but I can tell you that they are metric. either a 1 or a 1.5 thread.
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Old 06-25-2013, 09:12 AM   #4
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Still no luck. Anyone have a old junk Carter laying around for parts?
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Old 06-25-2013, 09:33 AM   #5
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they are size 4 x 40 maching thread and are not metric or at least mine were not same size as the screws that go in the throttle shaft assembly
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Old 06-25-2013, 10:44 AM   #6
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I tried some of the 4-40 that Lowes carries and the threads were a loose fit. I was thinking about adding some blue loctite because I do not want this to work its way out into the intake. I worry that the blue might be too strong for a #4 and cause it to strip out when I remove t again. The factory screws were a nice snug thread fit as it should be.
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Old 06-25-2013, 01:04 PM   #7
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What I would recommend is staking them.

That is what the factory does to keep them from coming out.

You simply hold the valve open and take a punch and flatten the end of the threads on both screws. You do not have to use a lot of force to do this simple little tap with a punch and a hammer.

They should be easy to thread in not loose not sure what you mean by loose but the valve plate should not move once they are tightened if it is then I am wrong and they very well could be metric.

regardless I would stake the screws
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Old 06-25-2013, 01:49 PM   #8
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I will stake them. And by loose I mean the screws feel a little too small when threaded in, but not completely tight. The word that comes to mind is slack in the threads.

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