Dimensions: Flange size, 1 1/4 inch S. A. E.
Primary venturi, 11/32 inch I. D.
Secondary venturi, 19/32 inch I. D.
Main venturi, 1 1/4 inch I. D.
Float Setting: Distance from seam of float to float chamber
cover, with weight of float on needle and
spring: 9/64 inch.
Vents: Balanced thru air horn to air cleaner via tubing
external
to carbureter.
Vent: Bowl chamber to carbureter bore, size
No. 68 (.031
inch) drill.
Gasoline Intake: Square vertical (spring loaded) needle
No.
53 (.0595 inch) drill size in
needle seat. Bleeder tube, as-
sembled over idle tube, with 2
side holes--No. 65 (.035 inch)
drill.
Low Speed Jet Tube: Jet size, No. 70 (.028 inch) drill
(in end
of tube). Auxiliary jet (on side of tube) size:
No. 75 (.021
inch) drill. By-pass (in air horn)
size: No. 52 (.0635 inch)
drill. Economizer (in body) size:
No. 54 (.055 inch) drill.
Idle Port: Upper port: slot type, length, .165 inch. Width,
.030 inch.
Idle Port Opening: Top of port--.125 to .129 inch above top
edge of valve with valve tightly
closed.
Lower Port (For Idle Adjustment Screw): Size, .053 to
.057
inch diameter.
Set Idle Adjustment Screw: 1/2 to 1 1/2 turns open. For
richer
mixture, turn screw out. Idle engine at 700
R.P.M. with deep
fording vents open.
Main Nozzle: In primary venturi, angle 20°. Discharge
jet size,
.0935 inch inside diameter. Main
nozzle bleed (tube in air
horn) Size: No. 70 drill.
Metering Rod (Diaphragm operated): Economy step, .070 inch.
Power Step .054 inch diameter.
Vacuum passage restriction, size: No. 50 (.070
inch) drill
Vacuum passage bleed to bore,
size: No. 65 (.035 inch) drill.
Metering Rod Jet: Size: .096 inch diameter.
Accelerating Pump: Diaphragm type, vacuum
operated. Dis-
charge jet size, No. 72
drill. Intake ball check size: No. 40
drill. Discharge ball check under
needle, size No. 50 drill.
Vacuum passage restriction, in
flange size: No. 52 (.0635 inch)
drill. Vacuum passage air bleed to
bore, size: No. 62 (.038
inch) drill.
Pump Stroke: No adjustment.
Choke: Manual--Offset, butterfly type with poppet valve.
Vacuum Spark Port: None.
Specifications come from a one page bulletin from Carter Carburetor Form 4960B released March 1953, revised March 1956. I have tried to keep the layout of the form. However, it should be in two columns.