ROCHESTER CARBURETORS

Bulletin 9C-329 15 December 1957

BULLETIN 9C-329
PAGE 4 OF 4

MODEL 2G — VACUUM OPERATED GOVERNOR

1956-58 CHEVROLET TRUCK

ADJUSTMENTS AND SPECIFICATIONS

CARBURETOR No.
1956
1956-57
1957
1958
265 CU. IN.
322 CU. IN.
283 CU. IN.
283 CU. IN.
7008393
7008394—Early 7011155—Late
7010717—Early 7011143—Late
7012233—Early 7012457—Late
Bore
1-7/16"
1-7/16"
1-7/16"
1-7/16"
Small Venturi
1/8"
1/8"
1/8"
1/8"
Large Venturi
1-3/32"
1-3/16"
1-3/32"
1-3/32"
Main Metering Jets
.052
.056
.052
.052
Idle Needle Holes
.040
.040
.040
.040
Sec.
Lower
.026
.026
.026
.026
Discharge
Middle
.025
.027
.025
.025
Holes
Upper
Pump Jets
.026
.024
.026
.026
Power Restrictions
.036
.034
.036
.036
Idle Tube Restrictions
.032
.049
.036
.036
ADJUSTMENTS
DIMENSIONS
DIMENSIONS
DIMENSIONS
DIMENSIONS
Float
Dimension
1-1/4"
1-15/64"
1-1/4"
1-19/64"
Level
Gauge
BT-129
BT-130
BT-129
BT-144
Float
Dimension
1-29/32"
1-29/32"
1-29/32"
1-29/32"
Drop
Gauge
BT-129
BT-130
BT-129
BT-144
Pump
Dimension
57/64"
57/64"
57/64"
57/64"
Rod
Gauge
BT-129
BT-129
BT-129
BT-144
Idle
Dimension
49/64"
Vent
Gauge
BT-144
TUNE-UP
1956
1956-57
1957
1958
Spark Plug Gap
.033 - .038
.033 - .038
.033 - .038
.033 - .038
Breaker Point Gap
SET WITH DWELL METER
SET WITH DWELL METER
SET WITH DWELL METER
.016
Cam Dwell
30°
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. 425 - A.T. "Drive"
CARBURETOR TOOLS AND GAUGES AS LISTED ARE AVAILABLE THROUGH UMS DISTRIBUTORS
tmp44E-1.jpg
Rochester Carburetor
A GENERAL MOTORS PRODUCT — A UNITED MOTORS LINE
tmp44E-2.jpg
FORM NO. 1257 I.P.S.
PRINTED IN U.S.A.

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