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post #1 of 8 (permalink) Old 10-05-2011, 05:55 PM Thread Starter
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vaccuum line

On my new carb I need to run the dizzy vac line to a source.
on my old one there was only 1 port, now there are 2.
the one on the left is too large.
can I use the one above and to the right?
how can I tell?
thanks as always
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post #2 of 8 (permalink) Old 10-05-2011, 09:04 PM
 
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I think The left port is full manifold vacuum, your dizzy line goes there. The upper is timed vacuum, above the throttle blades, no vacuum at idle. Is there a port for the PCV valve? I haven't messed with a Q-Jet in years, so I may be wrong.

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post #3 of 8 (permalink) Old 10-06-2011, 07:01 AM Thread Starter
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the pcv valve dosnt go to the carb, it gets it vac off the intake man.
so are all the "full vacuum" ports off of the base plate?
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post #4 of 8 (permalink) Old 10-06-2011, 07:41 AM
 
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TK, The vacuum line for the distributor goes to a vac port BELOW the throttle plates. So, if all your other vac lines are hooked up, you may use a reducer on the large (left) port and hook the dizzy hose there. You may also check the smaller port (right) , if it pulls vacuum at IDLE then you can use it. The object is to use vac that is below the throttle plates. E



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post #5 of 8 (permalink) Old 10-06-2011, 09:33 AM Thread Starter
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How can it be below the t. plate?
thats the intake manif.
ty
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post #6 of 8 (permalink) Old 10-06-2011, 10:35 AM
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Because it is.... Look at it. the bottom outlet is in the baseplate below the throttle plates. You want to run manifold vacuum to the dizzy if you can. That's the factory original method with '67's.
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post #7 of 8 (permalink) Old 10-06-2011, 12:35 PM
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I've heard recommendations both ways --- that distributor vacuum should be taken from a ported (above the plates) or a non-ported (below the plates) source. Actually, try them both and see which one your engine seems to "like" the best, and use it.

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post #8 of 8 (permalink) Old 10-06-2011, 04:05 PM
 
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Tk...TK...TK....how could you doubt your UE at this point???? That will cost you another Jim Beam!!! E



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  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, Lemans & GTO General Discussion

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