Tuning edelbrock carburetor

[Mack B]

Originally Posted by Dead Parrot

I have an in dash vacuum gauge. At 70mph cruise, it is spinning about 2800 rpm if the calculators are correct.(don't have a tach). Normal steady cruise vacuum will vary from 12~20 depending on wind direction and road slope. 350/TH350 mostly stock.

On a good day I have 16" at idle. I may be wrong about the load it's under, but it sounds like it's at wide open throttle at those speeds....I love it. It's a fun truck to drive, 283,m-21,4.11. It's loud, violent, revs hard...but not much danger in it getting away from you

I believe I've got it as close as the kit will let me. According to the chart a metering rod I don't have might be worth trying, but other than that I'm satisfied. I changed to the pink springs and that made a HOOGE difference all around. I had an off idle issue I didn't even realize till I put them in.

Right now the truck is performing better than it ever has the entire time I've owned it, that probably means something is about to let loose. I appreciate everyone's input!

[Dead Parrot]

Some cams will struggle to have much vacuum at idle.

Might make sure the vacuum advance pot on the dizzy is working. A bad one can really mess up part throttle response.

Sounds like it is time to put a few miles on it and let it tell you if it still needs more tuning. Might check the plugs in a few hundred miles and make sure the color looks good.

[68 P.O.S.]

Originally Posted by Mack B

On a good day I have 16" at idle. According to the chart a metering rod I don't have might be worth trying, but other than that I'm satisfied. I changed to the pink springs and that made a HOOGE difference all around. I had an off idle issue I didn't even realize till I put them in.

Your step-up springs are rated for half of your idle vacuum. So at 16" of vac you should be using the silver or the pink spring, which ever works better for you.

['68OrangeSunshine]

1404's are 500 CFM.
1405's are 600 CFM.
I use a 1404 on the 292 L6 in my '68 C/10 Stepside.
I have a Carter AFB 9605S [=Edl-1405, 600 CFM] on the 350 V8 in my '71 GMC Jimmy K/1500.
I prefer manual choke.