I would like to install power disc brakes on my F250 pickup.292Y block with an early 4barrel intake manifold I find no port to access manifold vacuum,was thinking about drilling and tapping manifold 1/8in. pipe ,also wonder if the vacuum was sufficent for a 7in.booster.
RED

 

Hmmm. I have never seen an intake manifold without a vacuum hole. Seems odd. Anyway, click on the link below and you will see a picture of the back of a 1956 car intake. I don't know if you can tell from the picture, but there are two 1/4 inch holes inside the large hole. Perhaps to create a venturi effect? Your guess is as good as mine.

http://tinypic.com/vhaurm.jpg

 

Thanks buns There is a manifold on Ebay item #4629345665 exactally like mine same part #ecz 9425-a. no sign of vacuum port either.not sure what year or model it came from,maybe someone out there might know


RED

 

Is this the one? Yeah, can't see a vacuum source. Wierd.


http://i2.tinypic.com/vnduuh.jpg

 

Well, all I had to do was go out to the garage to get the answer. I have the same intake on my Merc. The vaacuum is sourced from the base plate on the carb. This is where I get the vacuum for the windshield wipers. Mystery solved.