ROCHESTER CARBURETORS

Bulletin 9C-331 15 December 1957

BULLETIN 9C-331
PAGE 4 OF 4
MODEL 4G
1957-58 CHEVROLET TRUCK VACUUM ADJUSTMENTS AND SPECIFICATIONS
1957
1958
APPLICATION
283 CU. IN.
322 CU. IN.
283 CU. IN.
348 CU. IN.
CARBURETOR No.
7009661 7011161
7009662 7011162
7012303 7011487
7012145
PRIMARY
SECONDARY
PRIMARY
SECONDARY
PRIMARY
SECONDARY
PRIMARY
SECONDARY
Bore
1-5/16"
1-5/16"
1-7/16"
1-7/16"
1-5/16"
1-5/16"
1-7/16"
1-7/16"
Small Venturi
1/4"
1/4"
1/8"
1/4"
1/4"
1/4"
1/4"
1/4"
Large Venturi
1"
1-1/16"
1-3/16"
1-1/4"
1"
1-1/16"
1-1/8"
1-1/4"
Main Metering Jets
.047
.048
.056
.078
.048
.047
.054
.067
Idle Needle Holes
.046
.046
.046
.046
Sec.
Lower
.030
.029
.030
.031
Discharge
Middle
.027
.027
Holes
Upper
.027
.027
Supplementary Idle Ports
.025
.025
.025
.025
Lower Idle Bleed
.067
.036
.036
.067
.036
.045
.098
Pump Jets
.024
.024
.026
.026
Power Restrictions
.034
.043
.034
.058
Idle Tube Restrictions
.038
.026
.030
.026
.029
.040
ADJUSTMENTS
DIMENSIONS
DIMENSIONS
DIMENSIONS
DIMENSIONS

PRIMARY

SECONDARY

PRIMARY

SECONDARY

Float
Dimension

1-5/8"

1-35/64"
1-5/8"
1-11/16"
1-11/16"
Level
Gauge
BT-89
BT-117
BT-89
BT-143
BT-89
BT-143
Float
Dimension
2-1/4"
2-1/4"
2-1/4"
2-1/4"
Drop
Gauge
BT-93 or Scale
BT-93 or Scale
BT-93 or Scale
BT-93 or Scale
Pump
Dimension
1-1/16"
1-1/16"
1-1/16"
1-1/16"
Rod
Gauge
Scale
Scale
BT-145
BT-145
Idle
Dimension
31/32"
31/32"
Vent
Gauge
BT-145
BT-145
TUNE-UP
1957
1958
Spark Plug Gap
.033 - .038
.035
Breaker Point Gap
.016
.016
Cam Dwell
28-32
28-32
Ignition Timing
5 B.T.D.C.
4 B.T.D.C.
Idle R.P.M.
475 Neutral
475 Neutral
CARBURETOR TOOLS AND GAUGES AS LISTED ARE AVAILABLE THROUGH UMS DISTRIBUTORS
tmp204-1.jpg
Rochester Carburetor
A GENERAL MOTORS PRODUCT A UNITED MOTORS LINE
tmp204-2.jpg
FORM NO. 1259 I.P.S.
PRINTED IN U.S.A.

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