ROCHESTER CARBURETORS

Bulletin 9C-311 15 February 1957

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Rochester Carburetors
MODEL 2GC
1955-1956 CHEVROLET "V-8" ADJUSTMENTS AND SPECIFICATIONS
BULLETIN 9C-311
PAGE 3 OF 4 DATE: 2-15-57
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SETTING: 1955 - l-5/32"-GAUGE, BT-107 1956 -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.
SETTING: 1955 - 15/16"-GAUGE, BT-107 1956 - 57/64"-GAUGE, 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 the proper measurement from the top of the air horn casting to the top of the pump rod.
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SETTING: 1955-56 - INDEX
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.
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SETTING: 1955 - 1-29/32"-GAUGE, BT-107 1956 - l-29/32"-GAUGE, BT-129
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.
CHOKE ROD ADJUSTMENT
SETTING: 1955-56 - .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 between the upper edge of the choke valve and the air horn wall.
CO, WD, 131, 149, 9X, 9FR
FORM 1228 I.P.5. PRINTED IN U.S.A.

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