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Old 02-09-2009, 12:17 PM
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Good Brake Vacuum Source??

I just recently put a small block chevy 350 that i built myself into a 1985 s10. It's a 2wd short bed with a turbo 350 transmission. I had the brake vacuum like coming out of the brake booster hooked up to the breather on the valve cover to see if that would work because i know there's some vacuum in there but my brakes are terrible i have to put all ive got into it. I know that you're supposed to use a better vacuum source. What can I use for a good source? I have a spare vacuum fitting on the front of my holley street avenger 670cfm carburetor, but it's a tiny fitting something like 1/4". The line coming off of the booster has got to be 1/2" or so. Also, I have an edelbrock performer RPM intake manifold. Thanks for the help

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Old 02-09-2009, 12:52 PM
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Hi,
You need to get the vacuum from the intake manifold, on the manifold behind the carb their should be a plugged hole to screw
a fitting into to attach the vacuum hose to, open the hood on another Chevy & look at how it's set-up, also check that hose your now using for oil on the inside, you don't want any in there
Get back to us with the outcome.
Rich
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Old 02-09-2009, 02:27 PM
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I see the screw and where i previously plugged it up. Where can i get some sort of fitting that is able to clear the rear of the carburetor? There's only maybe 1/2"-3/4" of space under there. Thanks
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Old 02-09-2009, 03:05 PM
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Hi,
If their is a napa store near you go there because the parts people there are normally a more informed then the other chain
stores, they should have what you need a short 90*
you may need to remove the carb to install it.
Rich
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Old 02-09-2009, 03:54 PM
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awesome, thanks for the help guys
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Old 02-09-2009, 04:03 PM
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I was looking at the parts stores for that 90 degree fitting. Never could find it there. I ended up in the plumbing section at ACE Hardware. It took me a couple tries, but it was there. Only a couple bucks too.
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Old 02-09-2009, 05:18 PM
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Hmmmm. mine is hooked up to the back of my Quadrajet carb as a vacuum source: bad news?
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Old 02-09-2009, 06:35 PM
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Quote:
Originally Posted by Fergusonic
Hmmmm. mine is hooked up to the back of my Quadrajet carb as a vacuum source: bad news?
When ever I see a Q jet the booster is always plumbed to the back vacuum port.. It may even be a factory hook up. Not sure about that.. Works just fine.
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