edelbrock carburetors
Many of these trucks have had Edelbrock carbs installed in place of the original unit and it isn't unusual to get questions regarding how to tune them. While Edelbrock has an excellent document on that, there are some things that I want to record here so I can get back to them. So, this will be a work in progress.
First, here's a reference picture of the 1406 that is on Rusty. I've pointed out the three screws that allow adjusting the choke as well as which connection is ported vacuum.
First, here's a reference picture of the 1406 that is on Rusty. I've pointed out the three screws that allow adjusting the choke as well as which connection is ported vacuum.
The Eddy chokes require 12 volts to operate, and you can see the yellow wire connecting to the black choke cap in the above picture. And, the choke is easily adjusted by loosening the three screws shown securing the cap. But, before you start adjusting you should understand which way to rotate the cap. As shown in the picture on the left below, rotating the cap up/back makes the choke come off more quickly, so it is "leaner". And rotating the cap down/forward causes the choke to stay on longer, so it is "richer".
The middle picture shows a really lean choke since the index is rotated off the scale up and back. In fact, at room temp the choke blade isn't even closed. And the picture on the right shows the setting Rusty likes - 2 notches rich from the mid-point. Further, the choke blade is fully closed at room temp.
Also, you should know that you won't get the proper response out of the choke blade as you rotate the cap unless you have the throttle slightly open. But, that's all it takes to adjust an Edelbrock choke.
The middle picture shows a really lean choke since the index is rotated off the scale up and back. In fact, at room temp the choke blade isn't even closed. And the picture on the right shows the setting Rusty likes - 2 notches rich from the mid-point. Further, the choke blade is fully closed at room temp.
Also, you should know that you won't get the proper response out of the choke blade as you rotate the cap unless you have the throttle slightly open. But, that's all it takes to adjust an Edelbrock choke.
