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Old 06-30-2022, 10:46 AM   #1
Zax40
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Default Tapping intake for distributor vacuum connection

I currently have one of the early ~1937 aluminum intakes on the 59A in my '40 sedan. I am planning to swap on a later, Canadian CR7 aluminum intake.

The distributer vacuum brake connection currently connects to a threaded hole in the left front of the intake. Just below the third intake bolt on that side. The later intake does not have this threaded hole. Only a single on the back of the carb mounting surface.

Can I safely drill and tap the new intake for this connection? I believe it is 3/8-24.
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Old 06-30-2022, 10:52 AM   #2
Lawson Cox
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Default Re: Tapping intake for distributor vacuum connection

You should be able to do that. Just make certain you are drilling at a proper location to get a vacuum. You will probably have to take the intake off unless you have another one to go by.
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Old 06-30-2022, 03:18 PM   #3
V8COOPMAN
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Default Re: Tapping intake for distributor vacuum connection

.

You can't just drill a hole as some suggest. That factory location under that third bolt amounts to more than just a simple, tapped hole. The pictures BELOW should make the geometry of that FACTORY vacuum connection a little more obvious. That specific location also takes the firing order of the engine into account, as those two cylinders fire 360 apart from each other, making for a more-constant vacuum source for that one location. Coop





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Old 06-30-2022, 03:48 PM   #4
flatjack9
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Default Re: Tapping intake for distributor vacuum connection

Why not use the tapping on the back of the manifold?
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Old 06-30-2022, 05:36 PM   #5
Jack E/NJ
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Default Re: Tapping intake for distributor vacuum connection

Buy or make a carb spacer with vacuum ports. The original ports on mine are plugged.
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Old 07-01-2022, 10:23 AM   #6
Zax40
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Default Re: Tapping intake for distributor vacuum connection

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Quote:
Originally Posted by flatjack9 View Post
Why not use the tapping on the back of the manifold?
Just trying to use what I have. Didn't want to have to buy and bend up another compression fitting tube. Plus I think it looks cleaner with the short tube to the front.
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Old 07-01-2022, 10:37 AM   #7
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Default Re: Tapping intake for distributor vacuum connection

Seems to me I remember reading that Ford's fitting on the vacuum tube was something unique. Don't know if that applied to the thread pitch or the way the fitting seated to make a tight seal. There is no ferrel as you would see with a plumbing compression fitting.
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Old 07-01-2022, 10:45 AM   #8
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Default Re: Tapping intake for distributor vacuum connection

Yes, the Ford fitting is unique, and hard to find locally. If one were to go at it "home made" style, I would go to 1/8" pipe stuff that can be had from the hardware store
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