BULLETIN 9C-306 PAGE 4 OF 4
	QUICK REFERENCE SPECIFICATIONS
	1954 1955 1956 Synchromesh Powerglide Synchromesh Powerglide Synchromesh Powerglide Carburetor No. 7005921 7007181 7005982 7005922 7007172 7007180 7009255 7009254 Small Venturi 19/32" 19/32" 19/32" 19/32" 19/32" 19/32" Large Venturi 1-11/32" 1-11/32" 1-11/32" 1-11/32" 1-11/32" 1-11/32" Main Metering Jets .058 .058 .057 .057 .058 .058 Idle Needle Holes .073 .073 .073 .073 .073 .073 Sec. Lower .040 .040 .040 .040 .040 .040 Discharge Middle _ — — — — — Holes Upper .028 .028 .028 .028 .028 .028 Spark Drill ngs .050(4) .050(4) .050(4) .050(4) .050(4) .050(4) Pump Jets .031 .031 .031 .031 .031 .031 Power Restrictions .039 .039 .036 .036 .036 .036 Choke Res. Channel .101 .089 .101 .089 .101 .089 By Pass — — — — — — Idle Tube Res. .063 .063 .065 .065 .063 .063 ADJUSTMENTS Dimensions Dimensions Dimensions Dimensions Dimensions Dimensions Gauge No. Float Level 1-9/32" 1 9/32" 1-9/32" 1-9/32" 1-9/32" 1-9/32" M-250 Float Drop 1-3/4" 1-3/4" 1-3/4" 1-3/4" 1-3/4" BT-93 or Scale Automatic Choke Index 2 Notches Lean Index 2 Notches Leon Index 2 Notches Lean ------- Choke Rod .076 .076 .076 .076 .076 .076 BT-99 Unloader .230 .230 .230 .230 .230 .230 BT-99 TUNE-UP Synchromesh Powerglide Synchromesh Powerglide Synchromesh Powerglide Spark Plug Gap .035 .035 .035 .035 .035 .035 Breaker Point Gap .0125 -.0175 .0125 -.0175 .016 .016 .016 .016 Cam Dwell 38° -42° 38° -42° 26°-33° 26°-33° 28° -35° 28° -35° Ignition Timing 2° A.T.C. 2° A.T.C. T.D.C. T.D.C. T.D.C. T.D.C. Tappet Clearance Int. - .006 Hot Exh. - .013 Hot HYDRAULIC Int. - .006 Hot Exh. -.013 Hot HYDRAULIC HYDRAULIC HYDRAULIC Idle R.P.M. 475 425 Dr. 475 425 Dr. 475 425 Dr.
	CARBURETOR TOOLS AND GAUGES AS LISTED ARE AVAILABLE THROUGH UMS DISTRIBUTORS
		Rochester Carburetor
		A GENERAL MOTORS PRODUCT — A UNITED MOTORS LINE
	FORM 1229 l.P.S.	PRINTED IN U.S.A.

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