Vacuum sources 289 Performer RPM intake - Vintage Mustang Forums
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post #1 of 15 (permalink) Old 12-11-2018, 04:20 PM Thread Starter
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Vacuum sources 289 Performer RPM intake

Have an Edlebrock Performer RPM intake manifold on my rebuilt motor. It appears to have only one 3/8 npt fitting for vacuum. There are two small threaded holes. I have not tried to blow air through them but it looks like they bottom out as stud holes. So assuming I have one 3/8 NPT vacuum port can I thread a 1-3 brass adapter to get 3 - 1/4 inch vacuum ports? I need one for power brakes, one for C4, and one for distributor advance. I am not concerned about original as it is a restomod.
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post #2 of 15 (permalink) Old 12-11-2018, 04:35 PM
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What about a factory vacuum tree? I forget the NP size but you could use a reducing bushing if needed.

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post #3 of 15 (permalink) Old 12-11-2018, 06:02 PM
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Your carburetor should have some vacuum ports on it too.

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post #4 of 15 (permalink) Old 12-11-2018, 06:02 PM
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Sure, you can do that, I think.(not sure if volume capacity matters.)
Or use a factory type spacer and have 1 larger port and I think the Eddycrap carbs have another big port on its base.
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post #5 of 15 (permalink) Old 12-11-2018, 06:25 PM
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I believe you are correct. Most Eddy manifolds provide a single manifold vacuum port. The suggestions in previous posts are the typical remedies. What will you be hooking up to vacuum? Vacuum advance, power brakes, PCV, etc.?


'66 GT Fastback, 302, Edelbrock Top End, Sniper EFI/Aeromotive, MSD, JBA Headers & 2.5" Exhaust, T5Z, Currie 3.55 Trac-Loc
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post #6 of 15 (permalink) Old 12-11-2018, 07:32 PM Thread Starter
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Quote:
Originally Posted by rhutt View Post
I believe you are correct. Most Eddy manifolds provide a single manifold vacuum port. The suggestions in previous posts are the typical remedies. What will you be hooking up to vacuum? Vacuum advance, power brakes, PCV, etc.?

PCV goes direct from valve cover to carb spacer so I need vacuum for brake booster, trans, and distributor advance. Just want to make sure there is enough volume through one 3/8 port to drive those three things.


I picked up one of these low profile adapters. Figures I could just put the proper sized barb fittings in it. Running a Holley Street Avenger 4-barrel and not sure if there are any ports on it.



https://www.ebay.com/itm/Brass-Round...72.m2749.l2648





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post #7 of 15 (permalink) Old 12-11-2018, 08:53 PM
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Attached is what was used on 1966 and 67's. The large threaded port is for a 3/8 steel tube to which a 3/8 vacuum hose is attached for the Booster (the Booster requires the most for safety), the two nipples are for the C4 and for accessories (of course it could be for the distributor).
I think this might be your answer.


Bob
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post #8 of 15 (permalink) Old 12-11-2018, 08:56 PM
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Why do I have a feeling that won't be cheap or easy to find?

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post #9 of 15 (permalink) Old 12-11-2018, 09:28 PM Thread Starter
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Quote:
Originally Posted by 196667Bob View Post
Attached is what was used on 1966 and 67's. The large threaded port is for a 3/8 steel tube to which a 3/8 vacuum hose is attached for the Booster (the Booster requires the most for safety), the two nipples are for the C4 and for accessories (of course it could be for the distributor).
I think this might be your answer.


Bob


Yes, thank you for that, now if I can find one


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post #10 of 15 (permalink) Old 12-11-2018, 10:00 PM
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https://www.speedwaymotors.com/Vacuu...saAuizEALw_wcB


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post #11 of 15 (permalink) Old 12-11-2018, 10:20 PM Thread Starter
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That should work.


196667Bob, thanks for including the part number. Think that is a cleaner solution!



Last edited by cruising68; 12-11-2018 at 10:41 PM.
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post #12 of 15 (permalink) Old 12-11-2018, 11:03 PM
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I ran a 670 Street Avenger before installing my Sniper EFI. The carb has 4 vacuum ports. 1st pic below shows ported source for vacuum advance. You also have the same size port on the front along with a 3/8". You'll find another 3/8 port on the rear. Hook your brakes up to the manifold and use the carb ports for everything else.
I also run a brake booster!
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File Type: jpg SA670_2.jpg (387.9 KB, 4 views)
File Type: jpg SA670.jpg (372.9 KB, 4 views)
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post #13 of 15 (permalink) Old 12-11-2018, 11:09 PM Thread Starter
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Quote:
Originally Posted by rhutt View Post
I ran a 670 Street Avenger before installing my Sniper EFI. The carb has 4 vacuum ports. 1st pic below shows ported source for vacuum advance. You also have the same size port on the front along with a 3/8". You'll find another 3/8 port on the rear. Hook your brakes up to the manifold and use the carb ports for everything else.
I also run a brake booster!

Excellent, thanks! I will use the manifold for the brake booster and the carb for trans and distributor! Appreciate the pic!


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post #14 of 15 (permalink) Old 12-11-2018, 11:15 PM
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Looks like you've got the vacuum port figured out. A while back, I called Edelbrock to ID all the ports on the 289 Performer RPM intake. I made a diagram from this info and thought it might be helpful for reference.
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post #15 of 15 (permalink) Old 12-11-2018, 11:23 PM Thread Starter
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Originally Posted by jherrud View Post
Looks like you've got the vacuum port figured out. A while back, I called Edelbrock to ID all the ports on the 289 Performer RPM intake. I made a diagram from this info and thought it might be helpful for reference.


Thanks for that. Confirms the small holes are all blind holes.


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