[Hewfil1]

Originally Posted by rich weyand

Yeah, though you do have to do a bit of work on it.

One is to set the float height. They are always wrong, right out of the box.

To do that, you need a new gasket between the upper and lower.

Another is to put the pump shot to the richest setting. Our truck engines pull a lot of vacuum, so the air rush in is pretty high.

Another is to lean it out a bit. They are set up to the rich side from the factory so people who just throw them on an engine don't burn their valves. With the high vacuum, though, our engines pull harder on the gas than they are set up for.

one solution is to go one step leaner on the jets front and rear. Front is .098 and rear is .095 out of the box. Put the .095s in the front and put a new set of .092s in the rears is one solution.

I left the .095s in the back, went to .092s in the front, and then went to .062/.052 needles. That works, too.

You have to have the carb apart to change the jets, so do that while you are setting up the floats.

Also, go to the 8" step-up springs. The step-up springs should be about half the idle vacuum. The carb comes with 5" springs, but you are probably pulling more like 16-18" of vacuum at idle.

Apparently Edelbrock also makes them leaner from factory for "fuel economy". I have a truck made for power, I don't want economy. Dangit Edelbrock.