Jet Sizes( stock 59 A-B, single carb)

[Ralph S.]

Good morning everyone,

What's everyone running for jet sizes at given elevation? I'm pretty much sea level, between 200 and 300. Mostly interested in stock, single carb (Holley 94) motors. Trying to see if I'm close with what I have. Also, maybe a silly question. Does jet size affect your idle screws? Right now my motor seems to idle best with the idle screws about half of turn out from seated.

 

[flatjack9]

51 main jets and they do not affect idle.

 

[Ralph S.]

Is it common for the idle circuit screws to only need to be about half to 3/4 turns out?

 

[tubman]

On a rebuilt carb, I always start with them at 3/4 turn and they're always close, so you're in the neighborhood.