How do you adjust a edelbrock carb on a 350 Chevy?

Answer 1

Turn the engine on. Be careful of the fan it caut really mess you up. Get a flat head screw driver. Since you are not sure if the adjustment screws are in the exact same place. Take the left adjustment screw and turn it out all the way but"DO NOT TAKE IT ALL THE WAY OUT!!" Then that the right adjustment screw and turn it all the way in. After doing this take the right adjustment screw and turn it out in half turn increments, and turn it out 5 1/2 half turns out. Then take the left adjustment screw and turn it all the way in and then bring it out 5 1/2 half turns out. Now you screws are the exact same. You as a driver of this auto are going to be the one to decide what idle you want but it should be 4 1/2 half turns out should give you what you are looking for. Some say 3 1/2 half turns but we have found once the car sets for a period of time it will run funny and be harder to start. If all else fails take it to a "Good Auto Shop".

If you have a vacuum gauge available this works well, install the vacuum gauge to a full time manifold vacuum source (not a ported vacuum source) and with engine idling at aprox 600 rpms and at operating temperature, start to turn either air/fuel idle mixture screw in until you see the vacuum start to drop, stop there and turn the screw back out to maximum vacuum and stop. Do the same for the other air/fuel idle mixture screw, turn it in until the vacuum starts to drop then back it out until the gauge reads maximum vacuum then stop. Do this three times on each air/fuel idle mixture screw then adjust the idle to the desired idle speed, probably around 650 rpms.

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Lets make it short and sweet... TUrn the two idle mixture screws all the way in (Do not lock tite them). Now turn both screws out 2 full turn. Start engine, adjust idle to around 650-700rpms.

The more you turn screws out the richer, vice versa when turning them in.. leaner