Have 3310. Serviced it due to it sitting. Installed new metering plate gaskets and checked the vacuum pod, diaphragm was good and didn;t need replaced. Replaced cork seal between pod housing and carb body.

Lockout works and is adjusted. Any vac ports to check? Has original silver spring that worked before.

Car is falling apart when it needs secondaries.

You just revving it up or actually driving it? In park they wont open. Check the feul level in the rear yet?

How do you know its not opening is a fair question.

Did you double check that the diaphram made a good seal after you tightened the assembly before reinstalling on the carb.? Pull a little vacuuum (suck on it) to be sure it moves and holds.

Chris put a DP on it and see if it's a carb problem or something else.

Drove the car. Starved real bad as building power, yet very responsive and snappier with the smaller carb during part throttle acceleration. I had gone from an 850dp to this as its only 8.2 cr 268 cam. Car just fell on its face when needing more.....



I had tested the vacuum pod with a mighty vac. AOK.....

Put a paper clip on the rod coming out of the vacuum pod, then go drive the car.
If the clip is moved, your secondaries are working.
You may just need to spend a little time fine tuning your carb to the engine.

I would try a long purple spring and see if it gets better, with the plain spring the secondaries will not open all the way, it limits to about 1/2-5/8 open.

I usually keep going lighter on the spring until I can feel them open at WOT then go 1 step stiffer, on the 3 or 4 cars I've had with vac sec holleys all of them have ended up with a long yellow or short purple.

When the carb is still off the car I test the vac sec operation with compressed air. Just open the throttle all the way by hand and blow compressed air through the venturi that feeds the vac sec pod. You should be able to visually verify if everthing is in working order. It may take a little trial and error to find just where to flow the compressed air.

Had the same problem same carb. Someone worked over the front float with a pair of pliers.

I'll try the bench test. Put on the dp and really

hauls. Some stumble at higher rpm though (started with 72/78).

I'm gonna put some miles on the engine with the DP as the engine is a new config and short block hasn't really run in 5 years.

reduce the kill bleed hole leading to the sec. venturi and the carb will open so fast you will likely need a 50cc pump shot to overcome the lean bog.