Brake Booster Vacuum

rdf · July 28, 2020, 07:12:04 AM

I've got a 73 'Cuda with front disc and rear drum brakes. I'm putting a new motor in it and I'm just realizing the intake I have (Mopar M1, see pic) doesn't have any ports for a vacuum nipple. Does this mean I'll have to drill my own in the intake or is there somewhere else I can connect it to?

Rich G. · July 28, 2020, 07:50:48 AM

Should have a big port on the carb somewhere.

rdf · July 28, 2020, 07:58:33 AM

Quote from: Rich G. on July 28, 2020, 07:50:48 AM
Should have a big port on the carb somewhere.

Here's my carb

YellowThumper · July 28, 2020, 08:32:20 AM

Check mounting flange under the carb bowls. There should be the port fitting.

ClarkWGrizwald · July 28, 2020, 08:33:20 AM

You can always add a spacer plate below the carb with as many nipples as you want

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YellowThumper · July 28, 2020, 09:07:55 AM

Quote from: ClarkWGrizwald on July 28, 2020, 08:33:20 AM
You can always add a spacer plate below the carb with as many nipples as you want

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Bullitt- · July 28, 2020, 09:22:34 AM

Just an observation... The typical motor configuration that would benefit from an open plenum intake such as the M1 will have so much cam overlap that the vacuum will not be sufficient to give consistent power brake booster operation..
If dealing with manual brakes are not in your plans perhaps hydroboost or an electric vacuum pump should be considered.

Chryco Psycho · August 03, 2020, 10:14:19 PM

I use the port on the carb for PCV valve , & I drill a hole at the back between the ports to supply vacuum for brakes . I would drill for 1/4" pipe thread BTW.
Hydroboost is the other option

rdf · August 04, 2020, 09:18:56 AM

Quote from: Chryco Psycho on August 03, 2020, 10:14:19 PM
I use the port on the carb for PCV valve , & I drill a hole at the back between the ports to supply vacuum for brakes . I would drill for 1/4" pipe thread BTW.
Hydroboost is the other option

At this point, I am probably going to go this route....while I'd like to get an electric vacuum pump, I think it's best to save that money for more of the "unseen" items that I'm sure will pop up with my build.

GoodysGotaCuda · August 04, 2020, 10:32:29 AM

Quote from: rdf on August 04, 2020, 09:18:56 AM
Quote from: Chryco Psycho on August 03, 2020, 10:14:19 PM
I use the port on the carb for PCV valve , & I drill a hole at the back between the ports to supply vacuum for brakes . I would drill for 1/4" pipe thread BTW.
Hydroboost is the other option
At this point, I am probably going to go this route....while I'd like to get an electric vacuum pump, I think it's best to save that money for more of the "unseen" items that I'm sure will pop up with my build.

My manual discs do just fine with minimal complexity.

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HP_Cuda · August 04, 2020, 11:58:56 AM

Amen!

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