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CARBURETER SPECIFICATIONS 344S-377S 1939-4025 430S-430SV 455S 46I S
DIMENSIONS: Flange Size, 4 bolt I" I" I" 11(4" I"
Primary Venturi, I. D 1 1 /32" 11/32" 11/32" 1 1 /32" 1
/32"
Secondary Venturi, I. D 21/32" 21/32" 21/32" 19/32" 21/32"
Main Venturi, I. D I-1/16" 1.1/16" 1-1/16" 1-3/16" I-1/16"
FLOAT LEVEL 15/64" 15/64" 3/32" 3/32" 3/32"
VENTS: Outside 20 Dr. 20 Dr. 4-10 Dr. 4-10 Dr. 4-10 Dr.
Inside None None None None None
GASOLINE INTAKE 38 Dr. 38 Dr. 38 Dr. 38 Dr. 38 Dr.
GAS LINE CONNECTION: (Weatherhead) 5/16" 5/16" 5/16" ' 5/I6" 5/16"
LOW SPEED JET: Size 71 Dr. 71 Dr. 69 Dr. 66 Dr. 69 Dr.
By-Pass 49 Dr. 49 Dr. 53 Dr. 54 Dr. 53 Dr.
Economizer in Body 48 Dr. 48 Dr. 56 Dr. 56 Dr. 56 Dr.
Idle Bleed 54 Dr. 54 Dr. 54 Dr. 54 Dr. 54 Dr.
IDLE PORT: Slot Type: Length .145" .145" .150" .175" .150"
Width .030" .030" .030" .030" .030"
IDLE PORT OPENING: Valve Closed Tight .013"-.019" .013"-.019" .108"-.I
12" I33"-.137" .108" .112"
IDLE SCREW SEAT 52 Dr. 52 Dr. .0635" 52 Dr. 52 Dr.
IDLE ADJUSTMENT SCREW: Turns Open /4 to 3/4 1/4 to 3/4 1/4 to I I/2 to 11/2
I/4 to I I/4
MAIN NOZZLE: In Primary Venturi-45° Angle 30 Dr. 30 Dr. 30 Dr. 30 Dr.
30 Dr.
Closed Tip. Inside Diameter
Top Hole on 45° Angle 70 Dr. 70 Dr. 70 Dr. 70 Dr. 70 Dr.
Lower Hole on 60° Angle 52 Dr. 52 Dr. 52 Dr. 52 Dr. 52 Dr.
NOZZLE RETAINER PLUG 30 Dr. 30 Dr. - - -
METERING ROD: Standard .062" .062" .062" .0625" .063"
Economy Step
Middle Step, Tapers to .056" .056" .055" .055" .056"
Power Step .049" .049" .047" .046" .052"
Length of Rod 2-59/64" 2-59/64" 2-59/64" 2-59/64" 2-59/64"
METERING ROD JET: Size 45 Dr. .082" Dr. .082" Dr. .086" Dr.
.082" Dr.
METERING ROD GAUGE T109,27 T109-27 T109-113 T109-113 T109-113
ACCELERATING PUMP: Type Low Pressure Low Pressure High Pressure High Pressure
High Pressure
Discharge Jet 72 Dr. 72 Dr. 72 Dr. Twin-74 Dr. Twin-74 Dr.
Intake Ball Check 62 Dr. 62 Dr. 40 Dr. 40 Dr. 40 Dr.
Discharge Ball Check _ 45 Dr. 45 Dr. 45 Dr. - -
Discharge (Needle Seat) - - - 50 Dr. 50 Dr.
Relief Passage to Outside - 42 Dr. 42 Dr. 42 Dr. 42 Dr.
PUMP ADJUSTMENT (Use TI09-117S): 15/64" 15/64" - - -
Short Stroke .... °
Long Stroke - - - 9/32" 9/32" 9/32"
VACUUM SPARK PORT None None 4305-None . None
Diameter - - 4305V- - .039"-.041 "
- ) 041 "
.039"_
Top of Port, Above - - .029"-.033" - , .029"-.033"
CLIMATIC CONTROL: Set Housin g t 3445-Index Index Index Index Index
3775-2 Rich
CHOKE HEAT SUCTION HOLE 30 Dr. 26 Dr. 34 Dr. 36 Dr. 34 Dr.
Dr.-Drill Size. *Not sold separately-Part of 146-84S.
Part Name
Dust Cover
Metering Rod Jet and Gasket Assembly
Piston Plate Housing Gasket
Body Gasket ° _
Body Flange Gasket
Dash Pot Cylinder Gasket
Air Horn Gasket
Bowl Cover Gasket °
Coil Housing Gasket ..........................................•
Discharge Ball Check Assembly
Intake Ball Check Assembly
Blank Relief Check Assembly
Metering Rod Disk
Choker Shaft Washer
Throttle Shaft Washer
Inside Air Horn Screw Washer
Throttle Lever Screw Spring (Use with 100-16)
Bowl Cover
Bowl Cover and Strainer Assembly
Choke Piston Pin
Metering Rod Pin
Pin Spring 2
Pin Spring
Choke Piston Choke Piston
Port Plate
Piston Plate Housing
Thermostat Coil and Housing Assembly
Thermostat Coil and Housing Assembly
Cork Insulator Strip ----°--°----
Cork Insulator Disk
Fast Idle Cam and Collar Assembly
Fast Idle Cam and Collar Assembly
Vacuum Piston and Link Assembly Piston Plate
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