ROCHESTER CARBURETORS

Bulletin 9C-320 15 October 1956

1957 CHEVROLET — MODEL 2GC CARBURETOR
Adjustment Procedures
BULLETIN 9C-320
1.   FLOAT LEVEL
(1-1/4", Gauge BT-129)
With the air horn inverted and the gasket in place, position the float level gauge over the float so that it rests against the pump side of the power piston shaft, with the outer gauge leg in line with the center of the float. Bend the float arm to adjust.
2.  FLOAT DROP
Bend the float tang as required to obtain a dis­tance of 1-29/32" from the gasket surface to the bottom of the float, with the air horn upright and the float hanging free. Use scale or scribed mark on float and pump gauge.
3.  PUMP ROD
(57/64", Gouge BT-129)
With the idle screw backed out and the throttle valves completely closed, bend the pump rod as necessary with tool BT-18 to obtain a distance of 57/64" from the top of the air horn casting to the top of the pump rod.
4.  AUTOMATIC CHOKE
Loosen the three retaining screws- and rotate the choke cover counter-clockwise against coil tension until the index mark is in line with the index point on the choke housing. At room temperature the choke valve should be lightly closed.
5.  CHOKE ROD
(.089, Gauge BT-108)
Turn the idle screw in until it just contacts the second step of the fast idle cam. With the screw resting on the second step and against the high step, bend the choke lever tang with Tool BT-69 as nec­essary to admit the small end of the gauge etween the upper edge of the choke valve and the air horn wall.
6.   UNLOADER
(.360", Gauge BT-108)
Bend the unloader tang as necessary with Tool BT-69 to provide clearance for the large end of the gauge when the throttles are opened wide.
,._______________QUICK   REFERENCE ADJUSTMENT SPECIFICATIONS_____________________
ADJUSTMENT                                                           DIMENSION                                               GAUGE
Float Level                                                                          1-1/4"                                                     BT-129
Float Drop                                                                           1-29/32"                                           BT-129 or Scale
Pump Rod                                                                            57/64"                                                    BT-129
Automatic Choke                                                                Index                                                      -----------
Choke Rod                                                                              .089                                                       BT-108
Unloader                                                                               .360                                                       BT-108
Form 1202 I.P-S.

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