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How to tell if vacuum secondary is working?

Started by Paul G, January 02, 2010, 11:49:41 AM

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Paul G

January 02, 2010, 11:49:41 AM
How can I tell if my vacuum secondary is pulling in correctly, or at all? Holley 750, 727.
1972 Charger Topper Special, 360ci, 46RH OD trans, 8 3/4 sure grip with 3.91 gear, 14.93@92 mph.
1973 Charger Rallye, 4 speed, muscle rat. Whatever engine right now?

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Ghoste

#1
January 03, 2010, 06:35:16 PM
I've taken a fine piece of wire and tightened it onto the shaft that runs from the bottom of the opening diaphragm down to the buterflies.  Push it up agaisnt the bottom of the diaphragm portion and take the car out for a run.  Check it when you get back and you should be able to see how much it moved.
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