Keith,
There are, to my limited knowledge, two types of 4 barrels. The
mechanically operated secondaries, which are activated by external
levers and slotted plates that open them at a set opening of the
primaries at a rate set by the geometry of the linkages. These linkages
are primarily on the left side of the carb.
The other is a vacuum operated secondary system. On the Holley, (which
Ford has sometimes used with their label on it), there is a vacuum
operated diaphragm/draw-bar on the right rear side of the carb. It has
a large flat top, covering a rubber diaphragm, and has replaceable rate
control springs, seals, and check valves to open the secondaries when
the engine air-flow demands require more. These are adjustable through
spring selection.
Do either of these sound like yours?
Steve
--
Steve Laifman < Find out what is most >
B9472289 < important in your life >
< and don't let it get away!>
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