Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor
Mods on a 7041262 for a RAIV 455 engine. Are they OK?
MattK2:
Thanks Cliff. I’ve done a full history of manifold stat coils from 67-72. The 67-70 and the 71-2 which sat on a diff intake design. Found a Delco Bulletin from ‘71 with all the part numbers.
I may be dealing with a choke rod that’s over bent and not close to the 2.5” end to end length. Will confirm. If it was over bent the other part of the choke setup would not be able to compensate since the cam follower would clock differently. More CW than it should be which would make the stat rod appear to be much longer than it should be at full choke. Just a theory at this point.
MattK2:
Rod was overbent. Had to make it straight to be at 2.5”. The outer rod now sets in R notch. So it’s getting better.
MattK2:
Installed the new jets and tubes I bought from Cliff last fall.
To recap it’s a 7041262
Jets 73, Rods 43, Tubes 38
Idles nice down to 650 RPM
No bog.
But I have a new issue. It bucks at low speed off idle. Not sure what that’s telling me. Too lean?
It wasn’t bucking prior to swapping out the jets and rods per Cliff’s recommendation.
Kenth:
Is the upper adjustable main airbleed screw under the triangular retainer seated?
Do you have at least .052" down channel restrictions (may need .055")?
MattK2:
Not sure about the down channel restriction. I’m assuming they’re fine. As for the bleed screw under the triangle. My understanding was that it didn’t do much on the 71-2 carbs.
There was zero bucking until I after I swapped jets and tubes yesterday. So frankly I don’t know what improved. Yes the jetting is leaner than before but low speed driving has diminished.
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