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Old 04-09-2005, 06:49 PM
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Where is the vacuum on my 350 SB Chevy?

I have been searching for a vacuum line on my 350 SB Chevy engine and can't find it. Where should the vacuum line be coming from? I know it goes to my carburetor, but where does it come from? Little help please!

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Old 04-09-2005, 07:24 PM
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They dont go to the carb they come from it generally.

Two different types of vacuum that are used for different things.

Ported vacuum source is just above throttle blade and increases as throttle blade is opened. Used for distributor.

Manifold vacuum source is anywhere below the throttle blades is high at idle and will decrease when throttle blade is opened. Used for power brakes, actuators on heater controls, and other things like cruise control, headlight doors, etc.
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Old 04-09-2005, 08:20 PM
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Thanks Greg, makes sense! I put a new carb on today and had to block the vacuum. Never really though about it before. This would mean my advance is purely mechanical, correct?
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Old 04-09-2005, 09:53 PM
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yes

The vacuum advance is for fuel economy and does not restrict performance.
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