carb tuning??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ocbaud · 04-07-2004, 03:02 PM

okay, i bought a vacuum gauge today and am gonna borrow a tach that works from a friend of mine. my dad is getting a timing light today and tommorow we are gonna get the thing running right.

so, after the timing is set correct this is what i need to do?:

1. turn the idle mixture screws 1.5 - 2 turns out from completely in
2. set the idle speed(which screw do i set it with? the one by the choke, or the one by the throttle bracket?)
3. continue turning the IM screws out about a 1/4 turn each time, while bringing the idle back down after they are turned.
4. continue doing that until the vacuum will not rise anymore on the gauge. so that it has the highest vacuum at the desired idle rpm

does that sound right?

04-07-2004, 03:02 PM	#1
ocbaud Garage Queen Material Join Date: Oct 2002 Location: USA Posts: 4,129	carb tuning??? okay, i bought a vacuum gauge today and am gonna borrow a tach that works from a friend of mine. my dad is getting a timing light today and tommorow we are gonna get the thing running right. so, after the timing is set correct this is what i need to do?: 1. turn the idle mixture screws 1.5 - 2 turns out from completely in 2. set the idle speed(which screw do i set it with? the one by the choke, or the one by the throttle bracket?) 3. continue turning the IM screws out about a 1/4 turn each time, while bringing the idle back down after they are turned. 4. continue doing that until the vacuum will not rise anymore on the gauge. so that it has the highest vacuum at the desired idle rpm does that sound right?



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.