ROCHESTER CARBURETORS

Bulletin 9C-313 15 February 1957

	BULLETIN 9C-313 PAGE 4 OF 4
	MODEL 2G 1955-57 CHEVROLET TRUCK ADJUSTMENTS AND SPECIFICATIONS MODEL 2G
	1955 1956 1957 CARBURETOR NO. 7006770 7007171 7008399 7008383 7008384 7008706 7010649 7010716 7010718 7011135 7011132 7012147 Small Venturi 1/8" 1/8" 1/8" Large Venturi 1-3/32" 1-3/32" 1-3/32" Main Metering Jets .053 .053 .053 Idle Needle Holes .040 .040 .040 Sec. Lower .028 .028 .028 Discharge Middle .026 .026 .026 Holes Upper .028 .028 .028 Spark Drillings .040(2) .040(2) .040(2) Pump Jets .026 .026 .026 Power Restrictions .031 .031 .031 Idle Tube Restrictions .029 .029 .029 ADJUSTMENTS 1955 1956 1957 Float Level Dimension 1-5/32" 1-1/4" 1-1/4" Gauge BT-107 BT-129 BT-129 Float Drop Dimension 1-29/32" 1-29/32" 1-29/32" Gauge BT-107 BT-129 BT-129 Pump Rod Dimension 15/16" 57/64" 57/64" Gauge BT-107 BT-129 BT-129 TUNE-UP 1955 1956 1957 Spark Plug Gap .035 .033-.038 .033-.038 Breaker Point Gap .016 SET WITH DWELL METER SET WITH DWELL METER Cam Dwell 26°-33° 30° 30° Ignition Timing 5° B.T.D.C. 5° B.T.D.C. 5° B.T.D.C. Idle R.P.M. 450-500 450-500 450-500
		CARBURETOR TOOLS AND GAUGES AS LISTED ARE AVAILABLE THROUGH UMS DISTRIBUTORS Rochester Carburetor
		A GENERAL MOTORS PRODUCT	A UNITED MOTORS LINE
	FORM 1234 l.P.S.		PRINTED IN U.S.A.

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