Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor

Mods on a 7041262 for a RAIV 455 engine. Are they OK?

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MattK2:
Coil gets proper voltage.

Jets went down in size from 77 to 73. Rods remained at 43.

APT at max rich.

The way I read your tip-in procedure, anything over 100 rev increase was out of range. You used 50-100 revs. I had nearly 260+ rev increase at tip in. Used the choke valve. Went from 2000 to 2260. That’s not “close” from what I read. Conclusion, it needs a little more fuel. Already increased the air by bumping the tubes from 36 to 38.

I’m willing to try other parts. I don’t have much to choose from so I’ll source what I think I need and buy it. Just looking for a suggestion on what a possible part change could be. Smaller rod? Perhaps a 75 jet. I know what you mean about the jets controlling higher rev and how the rods control lower revs when party raised.

Cliff Ruggles:
In any and all cases tune for best results actually driving the vehicle. 

Tune for jet size first.  If the 73 jets are fine leave them alone.  If it needs more fuel at light engine load go to smaller primary metering rods.

It may be fine as-is, do some testing before making any more changes.....

MattK2:
I have a nice variety of jets and rods to work with now. Will block off the secondaries to assess primary jet performance. Once that’s good the rods will be dialed in.

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