Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor

turbo to non turbo considerations?

(1/2) > >>

F250 Restorer:
17059547

I'm wondering, if I use a QJ set up for turbo in a non turbo application, are there special considerations I need to deal with?

Thanks

Cliff Ruggles:
Yes, the turbo carburetors used external vacuum/boost reference.  They were also calibrated differently than the non-turbo engines.

They will have a vacuum port coming in thru the front of the baseplate to supply vacuum signal to the Power Piston and the baseplate is not drilled for it like other N/A applications.

Pretty simple to block off the external port and drill like the N/A baseplates, would take about as long as it took me to type this.......Cliff

F250 Restorer:
Thanks, Cliff. I can see that the p/piston has direct vacuum below the throttle blades, so I assume that no drilling is needed, right?

Cliff Ruggles:
Correct,  if the hole is drilled to supply vacuum directly from the intake to the PP good to go.....

F250 Restorer:
I'm going to need a kit for a 17059247, and idle tubes.

Regarding the baseplate above, for a 17059547, with a 280*adv cam and .480 lift, I believe I'll need a bit of bypass air. I don't have a drill press nor the know-how. Is drilling the throttle plates not an option?

Navigation

[0] Message Index

[#] Next page