General Category > Quadrajet Carb Talk and Tips

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mcx:
Picked up this clean core….This carb has the typical vacuum tube on the front/drivers side for a ported feed hook up, but the baseplate connection has a horizontal slit way located below the closed throttle plates?  What would this have been used to control?

Kenth:
Ignition vacuum advance.

mcx:
Kenth…would this be a full time vacuum source for advance, correct? or could it be ported being that low below  the throttle blades? It does have large idle bypass holes in the baseplate, I suppose the throttle blades might be full close to fully closed?
Thanks for the reply.

Kenth:
Yes, some engines uses full manifold vacuum for the vacuum advance. I have found one to one and half turn on the idle speed screw locates the throttle blades in a correct position to the off-idle slots.

mcx:
Thanks …I’ll just block the (full time)lower passage and drill a ported passage above the throttle blade.

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