Buick LeSabre 1965 Service Manual page 78

b. Carter Carburetor Calibrations—401 and 425 Engines
IMPORTANT: Calibrations are governed by the CODE number.
401 Eng.
Auto. Trans.
Model Designation AFB
Number of Barrels 4
Code Number, for Following
Calibrations 3921S
Bore Diameter, Primary 1 9/16"
Large Venturi Diameter, P r i m a r y . . 1 3/16"
Bore Diameter, Secondary 1 11/16"
Large Venturi Diameter, Secondary. . 1 9/16"
Float Level Adjustment 7/32"
Float Drop Adjustment 3/4"
Float Needle Seat #38
Low Speed Jet #65
Idle Discharge Port 200" x .030"
Lower Idle Port #52
Metering Jet, Primary 120-256
Metering Jet, Secondary
Production 120-158
High Altitude 120-233
Metering Rod
Production 16-219
High Altitude 16-255
NOTE: Use High Altitude Kit Above
3500 Feet
Use Kit Consisting of Secondary Jets,
Primary Rods and Springs.
Throttle Bore Vents #42
Anti-Percolator or Main Bleed Hole . #64
Pump Setting at Closed Throttle . . . 7/16" Center Hole
Pump Discharge Jet #72
Vacuum Spark Control Hole 3/32"
Choke Coil Housing Number 170BE478S
Choke Thermostat Setting Index
Choke Suction Hole #40
Choke Piston Setting (With
.026" Wire) .105"
Closing Shoe Clearance .020"
F . I. Cam Setting, Choke Closed . . . Index
F . I. Cam Number 181-351
Unloader Opening at Choke
Valve Edge 7/32"
Initial Idle Speed 1/2 Turn In
Initial Idle Mixture 3/4 Turn Out
Fast Idle Speed in Drive
(Hot, on Low Step) 600 RPM
425 Eng.
Auto. Trans.
AFB
4
3923S
1 9/16"
1 3/16"
1 11/16"
1 9/16"
7/32"
3/4"
#38
#68
.185" x .030'
#52
120-256
120-159
120-165
16-167
16-256
401-425 Eng.
Syn. Trans.
A F B
4
3922S
1 9/16"
1 3/16"
1 11/16"
1 9/16"
7/32"
3/4"
#38
#68
185" x .030"
f52
120-256
120-165
120-165
16-219
16-255
Dual 4-Bbl.
All Front
A F B
4
3645S
1 9/16"
1 3/16"
1 11/16"
1 9/16"
7/32"
3/4"
#38
#68
.150" x .030"
#69
120-256
120-222
-
16-286
_
Dual 4-Bbl.
Rear-Auto.
A F B
4
3925S
1 9/16"
1 3/16"
1 11/16"
1 9/16"
a/32"
3/4"
#38
#68
.150" x .030"
#52
120-256
120-222
-
16-219
_
Dual 4-Bbl.
Rear-Syn.
A F B
4
3924S
1 9/16"
1 3/16"
1 11/16"
1 9/16"
7/32"
3/4"
#38
#68
.180" x .030"
#52
120-256
120-222
-
16-298
_
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m
n
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O
#42
#64
7/16" Center Hole
#72
3/32"
170BE478S
Index
#40
.105"
.020"
Index
181-351
7/32"
1/2 Turn In
3/4 Turn Out
600 RPM
#42
#64
7/16" Center Hole
#70
.130" x .040"
170AW478S
Index
#40
.105"
.020"
Index
181-292
7/32"
1/2 Turn In
3/4 Turn Out
600 RPM
#42
#64
1/2" Center Hole
#70
NONE
NONE
NONE
NONE
NONE
.020"
NONE
NONE
NONE
NONE
NONE
NONE
#42
#64
1/2" Inner Hole
#70
.130" x .040"
170AW478S
Index
#40
.105"
.020"
' Index
181-351
7/32"
3 Turns Out
1 Turn Out
600 RPM
#42
#64
1/2" Inner Hole
#70
.130" x .040"
170AW478S
Index
#40
.105"
.020"
Index
181-284
7/32"
3 Turns Out
1 Turn Out
600 RPM
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z
m
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Z
a
m
X