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
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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.
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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
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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.
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CHOKE ROD ADJUSTMENT
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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.
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CO, WD, 131, U9, 9X, 9FR
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FORM 1227 I.P.S.
PRINTED IN U.S.A.
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