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Rochester
Carburetors
MODEL BC 1954-56
CHEVROLET "6"
PASSENGER
235 CUBIC INCH ENGINE
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BULLETIN 9C-306
PAGE 3 of 4 DATE: 2-15-57
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SETTING - 1-9/32", GAUGE M-250
With the air horn
inverted and the gasket in place, position the Gauge M-250 over the
floats with the gauge tang
inserted in the discharge nozzle. Bend the float arms as
necessary so that the top of each float just touches the gauge and the
float is centered between the gauge legs.
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SETTING - .076".
GAUGE BT-99
With the idle screw on the second step and against the
high step of the fast
idle
cam. bend the choke rod us necessary
with Tool BT-18 to obtain a
clearance of .076 (Tool BT-99)
between the lower edge of the
choke valve and the air horn
wall.
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SETTING - 1-3/4",
GAUGE BT-93 OR SCALE
Bend the float tang as necessary to obtain a distance of
1-3/4" from the gasket surface to
the bottom of the float, with
the air horn upright and the float
hanging free. Measure with
a Scale or Tool BT-93.
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SET MARK ON COVER TO
SPECIFIED POINT ON CHOKE HOUSING
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SETTING - .230", GAUGE BT-99
Bend the unloader tang
on the throttle lever as necessary with Tool BT-69 to obtain a
clearance of .230 (Tool BT-99) between the lower edge of the choke
valve and the air horn wall,
with the throttle valves wide open.
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SETTING -
SYNCHROMESH - INDEX
POWERGLIDE - 2 NOTCHES LEAN
Loosen the three retaining screws and rotate the choke
cover clockwise against coil
tension until the index mark on
the cover is in the proper
position with the index mark on the
housing. At room temperature, the
choke valves should be
lightly closed.
FORM 1229 I.P.S.
PRINTED IN U.S.A.
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AUTOMATIC CHOKE ADJUSTMENT
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CO, WD, 131, 149,
9X, 9FR
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