My Own Vice Grip Garage - Getting the 250 i6 Running Again

[Luke87gt]

Hi guys, some of you may be aware that I acquired a ‘69 c10 last year (250 i6, 3OTT). The truck sat for years with the previous owner before he decided to list it for sale. It was shipped from Washington to California and was able to get onto the trailer and off the trailer under its own power, but barely.

Since then, life happened and believe it or not I actually haven’t started it since it was driven into the garage last year.

Today I finally managed to remove the Rochester MonoJet carb for rebuild. It looks pretty rough as you can see from the pics.

Being new to carbs, I’m hoping you may be able to help me identify several parts of this carb. I’ve numbered the pictures for reference:

#1: what is this screw? It can’t be the idle screw as that’s on the back of the carb. Anyone know what it does?

#2: what is this capped vacuum line? Am I correct to assume that when I do power brake conversion, this is the vacuum port I will utilize for that upgrade?

#3: this port was connected to the vacuum advance. By the way, should I replace the vacuum advance? Do these have a wear out and go bad?

#4: what in the world is this? It looks to be a plate with 3 holes and it swivels. However, it wasn’t attached to anything. I wonder if that’s right or if I’m missing some connection?

By the way, one of the two nuts that holds the carb to the manifold was finger tight. That can’t be good :-)


Beyond the carb, I have a set of new plugs, wires, coil, cap, rotor, condenser, points, and fuel filter. I am about to order a new gas tank and replacement lines. I’ll get those items replaced, crank it, and see where we are.

I hope to utilize this as a progress thread to get this engine running again (I hope).

At some point I’ll ask for help with verifying timing, checking vacuum, and setting points.

Big thank you guys for the help!