Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

17058253 Post Build Drip

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Rte30tune:
Carb Update:

I ruined the Idle tubes removing them. I'll be buying a new pair from the site here.. lol. In my first timer ignorance, I neglected to remove these the first time around. However, the bottom orifice measures .0365

The primary metering rods are 3 steps: .024, .039 & .060, with no markings.

The jets measure .0725, also with no markings.

The down channel restriction measures .062, with the lower bleed in the base plate at .072

The upper air bleed? (denoted with the drill bit..) measures .11

It has DA secondary rods with a .0435 tip, on a "B" hanger (? not letter stamped, if i measured it correctly), however it is stamped "RP" on top with 31220 stamped on it's side.

I also have CH rods, CP & DA as well, plus a no name brass pair with .054 med tip.

I suppose with the cam issue, I'd open orifices to suit the recipe 3 specs?
Also, this carb has the idle bypass holes thru the body, near the outside wall, plugged off.. would opening those help or hinder?
 
I'll be ordering those replacement idle tubes directly.

Any advice appreciated, thanks!
Mike

77cruiser:
Looks to be a rebuilder carb.

Rte30tune:
Well I managed to stop the drip, finally.. I got the new idle tubes in the mail, drilled them to .039 and removed the lead plugs in the air passages going thru the body. Started right up and was doing ok.. but now it looks, or rather sounds like it collapsed one of the new China lifters on the new cam I just put in.. One issue straight into another.. Now it’s another cam swap I guess. Smaller this time.. lol. I’m thinking about a Chet Herbert cam:

CLC2A

RPM Range: 1200-5500

Advertised Duration: 270/280

Duration @ .050: 210/215

Lift: .435/.455

112 lobe center

I’ll call ahead to make sure this one has USA made lifters with it. It’s going in a Chevy 2wd truck, haul stuff once in a while. 700r4 trans.. not worried about mileage.. 3.42 gears.

I’ll post updates as things progress.
Thanks.

Mike

77cruiser:
If it flattened the cam I'd consider pulling the engine down & check bearing & clean everything out.
I know some people don't &  get by, but i myself wouldn't feel that lucky.

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