ROCHESTER CARBURETORS

Bulletin 9C-313 15 February 1957

BULLETIN 9C-313
PAGE 4 OF 4

MODEL 2G

1955-57 CHEVROLET TRUCK

ADJUSTMENTS AND SPECIFICATIONS MODEL 2G

1955
1956
1957
CARBURETOR NO.
7006770 7007171 7008399
7008383 7008384 7008706
7010649 7010716 7010718 7011135 7011132 7012147
Small Venturi
1/8"
1/8"
1/8"
Large Venturi
1-3/32"
1-3/32"
1-3/32"
Main Metering Jets
.053
.053
.053
Idle Needle Holes
.040
.040
.040
Sec.
Lower
.028
.028
.028
Discharge
Middle
.026
.026
.026
Holes
Upper
.028
.028
.028
Spark Drillings
.040(2)
.040(2)
.040(2)
Pump Jets
.026
.026
.026
Power Restrictions
.031
.031
.031
Idle Tube Restrictions
.029
.029
.029
ADJUSTMENTS
1955
1956
1957
Float Level
Dimension
1-5/32"

1-1/4"

1-1/4"

Gauge
BT-107
BT-129
BT-129
Float Drop
Dimension
1-29/32"
1-29/32"
1-29/32"
Gauge
BT-107
BT-129
BT-129
Pump Rod
Dimension
15/16"
57/64"
57/64"
Gauge
BT-107
BT-129
BT-129
TUNE-UP
1955
1956
1957
Spark Plug Gap
.035
.033-.038
.033-.038
Breaker Point Gap
.016
SET WITH DWELL METER
SET WITH DWELL METER
Cam Dwell
26-33
30
30
Ignition Timing
5 B.T.D.C.
5 B.T.D.C.
5 B.T.D.C.
Idle R.P.M.
450-500
450-500
450-500
tmp124-1.jpg
CARBURETOR TOOLS AND GAUGES AS LISTED ARE AVAILABLE THROUGH UMS DISTRIBUTORS
Rochester Carburetor
tmp124-2.jpg
A GENERAL MOTORS PRODUCT
A UNITED MOTORS LINE
FORM 1234 l.P.S.
PRINTED IN U.S.A.

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