Re: Secondaries Not Opening
In addition to Steptoe's suggestion, place small tyrap onto the secondary diaphram shaft directly underneath the housing touching the housing.
Go for a road trip. Lift hood and check position of tyrap on shaft. If it has moved, secondaries have opened.
Another cause for not opening is the secondary plates may be stuck closed in the bore. If this is the case, you may have to remove the carb from the manifold and screw up the setscrew on the passenger side of the throttle base plate on the secondary side. Open it just enough to keep the secondaries from sticking close. You will have to reset the curb idle lower because you've opened the throttle. The sec's don't need much, maybe a 1/4-1/2 turn of the screw will prevent the sec's from sticking.
There is also a secondary spring kit and you can install a weaker spring to pull in the secondaries.
Holley secondaries only open when the demand from the engine is needed. A heavy car with a low numerical rear gear is a prime example. If WOT is given, then the secondaries will open sooner on a full size car than on a smaller compact car. Engine rpm has alot to do with secondary opening. Anything below 5K rpm, they usually don't open up in a light car.
An old racer's trick is to put a screw and nut into the driver's side linkage and use the mechanical linkage to pull open the secondaries. You will see a linkage rod going from the primary to secondary slot. As you open the primaries to full throttle, the rod slides in the secondary slot. Add the screw & nut before the rod so the rod bumps against the screw and pulls the secodaries open. Be prepared for a bog at low rpm.
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