[pszikszai]

I just rebuilt a Holley 6619-1.
This is a used carb that I never used before.

The idle ajustment screws work best when they are out only about 1/2 turns.
Idles nice.

The engine then runs smooth.
The dwell and timings are correct.
The engine is a Studebaker 289.
I always had Holleys that used idle adjustment close to the recommended 1 1/2
turns out.
Will this be a problem.
If yes what is there to do about it?

Thanks
Paul

[cobalt327]

Originally Posted by pszikszai

I just rebuilt a Holley 6619-1.
This is a used carb that I never used before.

The idle ajustment screws work best when they are out only about 1/2 turns.
Idles nice.

The engine then runs smooth.
The dwell and timings are correct.
The engine is a Studebaker 289.
I always had Holleys that used idle adjustment close to the recommended 1 1/2
turns out.
Will this be a problem.
If yes what is there to do about it?

Thanks
Paul

The carb you have has an idle set-up where the screws work "backwards" from a regular Holley carb like a 4150/4160.

So, being as how this is a replacement-type carb, it actually has a lean idle circuit, so you're at the rich end of the adjustment.

Not to worry, though. As long as you are set to the highest vacuum reading or highest idle RPM, you are good to go.

[F-BIRD'88]

Holleys recommendation is a starting point to fire up a new setup not the "best" number of turns of the idle mix screws.

Read the directions again. Set the idle screws for best idle manifold vacuum and rpm once fully warmed up. As said those idle screws work bas-akwards on that carb..

[pszikszai]

Thank you both for the help.