ROCHESTER CARBURETORS

Bulletin 9C-328 15 December 1957

BULLETIN 9C-328
PAGE 4 OF 4

MODEL 2G

1955-58 CHEVROLET TRUCK

ADJUSTMENTS AND SPECIFICATIONS

1955
1956
1957
1958
CARBURETOR NO.
7006770 7007171 7008399
7008383 7008384 7008706
7010649 7010716 7010718 7011135 7011132 7012147
7012035 7012047
7012453 7012455
Small Venturi
1/8"
1/8"
1/8"
1/8"
1/8"
Large Venturi
1-3/32"
1-3/32"
1-3/32"
1-3/32"
1-3/32"
Main Metering Jets
.053
.053
.053
.053
.053
Idle Needle Holes
.040
.040
.040
.040
.040
Sec.
Lower
.028
.028
.028
.028
.028
Discharge
Middle
.026
.026
.026
.026
.026
Holes
Upper
.028
.028
.028
.028
.028
Spark Drillings
.040(2)
.040(2)
.040(2)
.040(2)
.040(2)
Pump Jets
.026
.026
.026
.026
.026
Power Restrictions
.031
.031
.031
.039
.041
Idle Tube Restrictions
.029
.029
.029
.032
.028
ADJUSTMENTS
1955
1956
1957
1958
Float Level
Dimension
1-5/32"
1-1/4"
1-1/4"
1-19/64"
Gauge
BT-107
BT-1 29
BT-129
BT-144
Float
Drop
Dimension
1-29/32"
1-29/32"
1-29/32"
1-29/32"
Gauge
BT-107
BT-129
BT-129
BT-144
Pump Rod
Dimension
15/16"
57/64"
57/64"
57/64"
Gauge
BT-107
BT-129
BT-129
BT-144
Idle Vent
Dimension
49/64"
Gauge
BT-144
TUNE-UP
1955
1956
1957
1958
Spark Plug Gap
.035
.033-.038
.033-.038
.035
Breaker Point Gap
.016
SET WITH DWELL METER

SET WITH DWELL METER

.016
Cam Dwell
26-33
30
30
28 - 32
Ignition Timing
5 B.T.D.C.
5 B.T.D.C.
5 B.T.D.C.
4 B.T.D.C.
Idle R.P.M.
450-500
450-500
450-500
475 SYN."NEUT." 425 AUTO. TRANS."DRIVE"
CARBURETOR TOOLS AND GAUGES AS LISTED ARE AVAILABLE THROUGH UMS DISTRIBUTORS
Rochesfer Carburefor
tmp374-1.jpg
tmp374-2.jpg
A GENERAL MOTORS PRODUCT
A UNITED MOTORS LINE
FORM 1356 I.P.5.
PRINTED IN U.S.A.

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