ROCHESTER CARBURETORS

Bulletin 9C-317 15 February 1957

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Rochester Carburetors
MODEL 4GC
1956 CHEVROLET "V-8"
POWER PACK
ADJUSTMENTS AND SPECIFICATIONS
BULLETIN 9C-317
PAGE 3 OF 4 DATE-. 2-15-57
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SETTING 1-5/8", GAUGE BT-89
With the air horn gasket in place, position the gauge over the floats and against the curvature in the air horn bore. Bend the float arms at the rear of the assembly so floats just touch the gauge. Then bend float arms horizontally to center each pontoon between the gauge legs. Repeat with same gauge on other set of floats.
SETTING 1-1/16", USE SCALE
With the idle stop screws backed out and the throttle valves completely closed, bend the pump rod with Bending Tool BT-18 as necessary to obtain the correct dimension from the top surface of the air horn to the bottom of the pump plunger shaft.
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SET MARK ON COVER TO SPECIFIED POINT ON CHOKE HOUSING
SETTING 1 NOTCH LEAN
Loosen the three retaining screws and rotate the choke cover counterclockwise against coil tension until the index mark is in the proper position with the index point on the choke housing.
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SETTING 2-1/4", GAUGE BT-93 OR SCALE
Bend the float tang as required to obtain a distance of 2-1/4" from the gasket surface to the bottom of the float, with the float hanging free.
CHOKE ROD ADJUSTMENT
SETTING .043", GAUGE BT-131
With the idle screw resting on the second step of the fast idle cam and against the shoulder of the high step, bend the choke rod with Bending Tool BT-18 to obtain sufficient clearance to allow the insertion of the correct gauge between the upper edge of the choke valve and the dividing wall of the air horn.
CO, WD, 131, U9, 9X, 9FR
FORM 1227 I.P.S. PRINTED IN U.S.A.

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