AFB carb 525 cfm

rich freitag · 09-27-2008, 06:44 PM

I'm having a carb problem. I have a 1964 Dodge 383. The 'carb' is running out of fuel. The pump is a new mallory 250 with the return line going from the pump to the cell. The fuel line is 1/2" to the reg. The mallory reg. fuel presure is @ 6 psi. The carb I have has a stock booster on the front primary side. Whats got me bugged, is on the underside, it has a hole from the factory on the discharge nozzle. AFB has used this type on the 1963-1965 carbs, I think. I have a 4130 off a 1966 and it has a newer style booster with no hole on the bottom, like the edelbrocks. I don't know if this hole is helping or hurting. I have 98 jets in the back. Floats are set at 7/32, float drop is 3/4. Fuel has been a problum since day one with my motor. The last time out, I put a 750 edelbrock on it, and the motor ran fine. I'm stuck running this small AFB. Any suggestions?

ss3011 · 09-27-2008, 09:58 PM

What size needles and seats are in the 525 ? Might compare them to the 750.

George Mirza · 09-28-2008, 09:26 PM

Make sure you have the triangle shaped needles in it, not the square ones. Also open the hole in the seats to .120 or #31 drill. Make sure there are no burrs around the hole on the needle side after you drill them.

Shawn Blair · 10-11-2008, 02:13 PM

Yes use the big needles and seats,also adjust float level way higher than that, about an 1/8 inch or so, just carefully bend float until it's still parallel with the lid and make sure you still have enough float drop.I have my super stock AVS set this way. If you have any questions call me at 360-815-6352.

09-27-2008, 06:44 PM	#1
rich freitag Junior Member Join Date: Mar 2008 Location: cicero n.y. Posts: 29 Likes: 7 Liked 0 Times in 0 Posts	AFB carb 525 cfm I'm having a carb problem. I have a 1964 Dodge 383. The 'carb' is running out of fuel. The pump is a new mallory 250 with the return line going from the pump to the cell. The fuel line is 1/2" to the reg. The mallory reg. fuel presure is @ 6 psi. The carb I have has a stock booster on the front primary side. Whats got me bugged, is on the underside, it has a hole from the factory on the discharge nozzle. AFB has used this type on the 1963-1965 carbs, I think. I have a 4130 off a 1966 and it has a newer style booster with no hole on the bottom, like the edelbrocks. I don't know if this hole is helping or hurting. I have 98 jets in the back. Floats are set at 7/32, float drop is 3/4. Fuel has been a problum since day one with my motor. The last time out, I put a 750 edelbrock on it, and the motor ran fine. I'm stuck running this small AFB. Any suggestions? __________________ Rich Freitag 1440 SS

09-27-2008, 09:58 PM	#2
ss3011 Senior Member Join Date: Feb 2002 Location: Southeast Michigan Posts: 909 Likes: 70 Liked 239 Times in 114 Posts	Re: AFB carb 525 cfm What size needles and seats are in the 525 ? Might compare them to the 750.

10-11-2008, 02:13 PM	#4
Shawn Blair Member Join Date: Dec 2007 Location: Everson, WA. Posts: 122 Likes: 1 Liked 0 Times in 0 Posts	Re: AFB carb 525 cfm Yes use the big needles and seats,also adjust float level way higher than that, about an 1/8 inch or so, just carefully bend float until it's still parallel with the lid and make sure you still have enough float drop.I have my super stock AVS set this way. If you have any questions call me at 360-815-6352.

09-28-2008, 09:26 PM	#3
George Mirza Senior Member Join Date: Jan 2002 Location: North Attleborough Ma. Posts: 522 Likes: 0 Liked 0 Times in 0 Posts	Re: AFB carb 525 cfm Make sure you have the triangle shaped needles in it, not the square ones. Also open the hole in the seats to .120 or #31 drill. Make sure there are no burrs around the hole on the needle side after you drill them.