Disc brake conversion question

• May 24, 2019

• #1

dan juhasz

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bought a disc brake conversion from leed brakes for the 66 Hemi coronet. Is it advisable to tee the PCv hose to supply the booster? The afb’s have no large vacuum nipples and the intake has no other vacuum source that I can see. What do you think?
Dan

 

• May 24, 2019

• #2

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steve340

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I read or heard somewhere not to run PVC and booster to the same vacuum source.

 

• May 24, 2019

• #3

dan juhasz

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steve340 said:

I read or heard somewhere not to run PVC and booster to the same vacuum source.

Click to expand...

I don't like the idea , I just wonder how it was done on a car originally equipped with power brakes

 

• May 24, 2019

• #4

dan juhasz

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Did cars originally equipped with power brakes have a different carb that had a nipple provision for pcv so the manifold provision could be used for the booster?

 

• May 24, 2019

• #5

69L48Z27

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I don’t know about Hemi intakes but my 440 has a pipe thread tap into a runner behind the carb. Then a nipple out of that.

 

• May 24, 2019

• #6

69L48Z27

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Something like this.

 

• May 24, 2019

• #7

FitzyB5

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I have a 66 Street Hemi in my 67 Coronet. My booster vacuum line
is on port directly on intake rear.

 

• May 24, 2019

• #8

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steve340

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Generally I believe PCV is under the carb so a few cylinders get there share of the gunk the PCV draws in to the engine. If you have it on a leg of the manifold that goes to one cylinder that cylinder can oil up.
As the other guys have posted the power brake comes from one side of the intake.
Are you sure the manifold does not have a port and you missed it?
Most cars that could have power brakes would have the port.
Hard to imagine they would bother having two separate intake manifolds.

 

Last edited: May 24, 2019

• May 25, 2019

• #9

dan juhasz

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FitzyB5 said:

View attachment 771750 I have a 66 Street Hemi in my 67 Coronet. My booster vacuum line
is on port directly on intake rear.

Click to expand...

I have that port but it was used for pcv, what is your pcv hooked up to?

 

• May 25, 2019

• #10

dan juhasz

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I ended up removing the primary carb, removed what appeared to be a 3/8 core valley plug that was pressed in , tapped it out for a brass nipple and used this for pcv. I used the manifold tap for the booster.

 

• May 25, 2019

• #11

FitzyB5

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My PCV is on port at base of rear carburetor.

 

• May 25, 2019

• #12

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steve340

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What you have done should work fine. Good work.