ROCHESTER CARBURETORS

Bulletin 9C-328 15 December 1957

	BULLETIN 9C-328 PAGE 4 OF 4
	MODEL 2G 1955-58 CHEVROLET TRUCK ADJUSTMENTS AND SPECIFICATIONS
	1955 1956 1957 1958 CARBURETOR NO. 7006770 7007171 7008399 7008383 7008384 7008706 7010649 7010716 7010718 7011135 7011132 7012147 7012035 7012047 7012453 7012455 Small Venturi 1/8" 1/8" 1/8" 1/8" 1/8" Large Venturi 1-3/32" 1-3/32" 1-3/32" 1-3/32" 1-3/32" Main Metering Jets .053 .053 .053 .053 .053 Idle Needle Holes .040 .040 .040 .040 .040 Sec. Lower .028 .028 .028 .028 .028 Discharge Middle .026 .026 .026 .026 .026 Holes Upper .028 .028 .028 .028 .028 Spark Drillings .040(2) .040(2) .040(2) .040(2) .040(2) Pump Jets .026 .026 .026 .026 .026 Power Restrictions .031 .031 .031 .039 .041 Idle Tube Restrictions .029 .029 .029 .032 .028 ADJUSTMENTS 1955 1956 1957 1958 Float Level Dimension 1-5/32" 1-1/4" 1-1/4" 1-19/64" Gauge BT-107 BT-1 29 BT-129 BT-144 Float Drop Dimension 1-29/32" 1-29/32" 1-29/32" 1-29/32" Gauge BT-107 BT-129 BT-129 BT-144 Pump Rod Dimension 15/16" 57/64" 57/64" 57/64" Gauge BT-107 BT-129 BT-129 BT-144 Idle Vent Dimension 49/64" Gauge BT-144 TUNE-UP 1955 1956 1957 1958 Spark Plug Gap .035 .033-.038 .033-.038 .035 Breaker Point Gap .016 SET WITH DWELL METER SET WITH DWELL METER .016 Cam Dwell 26°-33° 30° 30° 28° - 32° Ignition Timing 5° B.T.D.C. 5° B.T.D.C. 5° B.T.D.C. 4° B.T.D.C. Idle R.P.M. 450-500 450-500 450-500 475 SYN.—"NEUT." 425 AUTO. TRANS.—"DRIVE"
	CARBURETOR TOOLS AND GAUGES AS LISTED ARE AVAILABLE THROUGH UMS DISTRIBUTORS Rochesfer Carburefor
		A GENERAL MOTORS PRODUCT	A UNITED MOTORS LINE
	FORM 1356 I.P.5.		PRINTED IN U.S.A.

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