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Rochester Carburetors
MODEL BC 1954-56 CHEVROLET "6"
PASSENGER 235 CUBIC INCH ENGINE
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.
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
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.
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.
AUTOMATIC CHOKE ADJUSTMENT
CO, WD, 131, 149, 9X, 9FR

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