600 single pumper
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Joined: Aug 2005
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From: St. louis
Car: 85 berlinetta
Engine: none
Transmission: 700r4very soon t5
600 single pumper
i bought this off a guy and noticed both vac lines on it (for vac sec) are together. do i use the one off the side of the carb or the bottom plate
Joined: Mar 2000
Posts: 43,187
Likes: 45
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
The circuit for the vacuum secondaries is built into the carb.
The ports you're talking about are for vacuum-operated accessories, such as the vacuum advance on the distributor. The one on the side is "ported" or "timed" vacuum, meaning there isn't any vacuum on it at idle, but it comes on as the throttle is opened. The one on the base is "manifold", meaning it has the same vacuum as is in the interior of the manifold. Which you use is dependant upon the rest of your setup - the typical smog-era distributor uses the ported source. Many guys run manifold vacuum with no problems.
The ports you're talking about are for vacuum-operated accessories, such as the vacuum advance on the distributor. The one on the side is "ported" or "timed" vacuum, meaning there isn't any vacuum on it at idle, but it comes on as the throttle is opened. The one on the base is "manifold", meaning it has the same vacuum as is in the interior of the manifold. Which you use is dependant upon the rest of your setup - the typical smog-era distributor uses the ported source. Many guys run manifold vacuum with no problems.
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