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holley 80457 to gm 346250 intake

 
wetinnw
I love my Chevy Chevette!
Posts: 2
Joined: 03/13
Posted: 03/25/13 12:44 PM

vacum for break booster  

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68scott385
I mow my lawn and find Chevys
Posts: 1994
Joined: 10/09
Posted: 03/25/13 01:25 PM

Do you have a question to ask or a statement to make?  
68scott385 68scott385 68scott385

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pepsi1
I mow my lawn and find Chevys
Posts: 1718
Joined: 09/11
Posted: 03/25/13 02:59 PM

Most Holley carbs are taped for a fitting in the back side of the carb. There maybe a brass plug in the rear of the carb. You will have to look for it. (Under the rear float bowl)... I can't do that.

If it's not there. Then sometime the Factory intake has a taped fitting in the intake that will require a 90* elbow fitting. For the vacuum source to the power brake booster...The same goes for the intake. If it's a very early Factory Intake you may not have a vacuum source in it. Back in the day Hi Po engines didn't have power brakes...(Do to Lack of a good vacuum). The cam was usually too big.

If there isn't a fitting in either. Then you can look for a 1" spacer plate that has a port built into it, so you can run a vacuum source to the Power Booster...

Or get creative and drill and tap a vacuum source in the intake manifold, for the power brake booster..
You need engine vacuum for the power booster to operate properly...

Bob  

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wetinnw
I love my Chevy Chevette!
Posts: 2
Joined: 03/13
Posted: 03/25/13 07:55 PM

thank you for the imfo . i used the threaded vac line behind the carb ...   havent fired it yet.maybe later  

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