ROCHESTER CARBURETORS

Bulletin 9C-320a 1 July 1957

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United Motors Service
DIVISION OF GENERAL MOTORS CORPORATION CENTRAL OFFICE —DETROIT
BULLETIN 9 C-320A
PAGE 1
DATE: 7-1-57 File in Front of Chevrolet Bulletin 9 C-320
Rochester Carburetors
PARTS AND SERVICE CHANGE BULLETIN

1957 CHEVROLET—V-8 2GC Carburetor

This service bulletin is to inform you of changes made in production at the factory and give you up-to-date parts and service information to cover these changes.
APPLICATION
GOVERNOR EQUIPPED
POWERGLIDE
SYNCROMESH
CARB. PART NOS.
7010719 Early 7011149 Late
7010648 Early 7011224 Late
7010647 Early 7011131 Late
SERVICE PKGE.
7015719
7015715
7015712
PART CHANGES
Illus.
Old
New
Old
New
Old
New
No.
Description
Number
Number
Number
Number
Number
Number
20
Fitting, Fuel Inlet
145475
7010976
145745
7010976
145745
7010976
49
Venturi Cluster
7009493
7011497
7009493
7011497
56
Jet-Std.
7002952
7002953
7002952
7002951
7002952
7002953
64
Gasket, Flange
*3718359
Note: The above changes should be made to Bulletin 9 C-320. *New part added for governor equipped models only.
SERVICE CHANGES
The late carburetors listed above were released under the new part numbers due to a new fuel inlet fitting change. Calibrations and adjustments are the same as on the early units.
The venturi cluster was changed on the Governor equipped and Synchromesh carburetors from part No. 7009493 to 7011497. This was a minor production change. No change necessary in servicing earlier units.
Main metering jets were changed on the Governor and Synchromesh carburetors from part No. 7002952 (52) to 7002953 (53).
Main metering jets on the Powerglide carburetors was changed from part No. 7002952 (52) to 7002951 (51). This change was made for improved part throttle performance.
CO, WD, 131, 132:1-9-16, 149, 9X, 9FR, 9FD

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