ROCHESTER CARBURETORS

Bulletin 9C-329 15 December 1957

	BULLETIN 9C-329 PAGE 4 OF 4
	MODEL 2G — VACUUM OPERATED GOVERNOR 1956-58 CHEVROLET TRUCK ADJUSTMENTS AND SPECIFICATIONS
	CARBURETOR No. 1956 1956-57 1957 1958 265 CU. IN. 322 CU. IN. 283 CU. IN. 283 CU. IN. 7008393 7008394—Early 7011155—Late 7010717—Early 7011143—Late 7012233—Early 7012457—Late Bore 1-7/16" 1-7/16" 1-7/16" 1-7/16" Small Venturi 1/8" 1/8" 1/8" 1/8" Large Venturi 1-3/32" 1-3/16" 1-3/32" 1-3/32" Main Metering Jets .052 .056 .052 .052 Idle Needle Holes .040 .040 .040 .040 Sec. Lower .026 .026 .026 .026 Discharge Middle .025 .027 .025 .025 Holes Upper — — — — Pump Jets .026 .024 .026 .026 Power Restrictions .036 .034 .036 .036 Idle Tube Restrictions .032 .049 .036 .036 ADJUSTMENTS DIMENSIONS DIMENSIONS DIMENSIONS DIMENSIONS Float Dimension 1-1/4" 1-15/64" 1-1/4" 1-19/64" Level Gauge BT-129 BT-130 BT-129 BT-144 Float Dimension 1-29/32" 1-29/32" 1-29/32" 1-29/32" Drop Gauge BT-129 BT-130 BT-129 BT-144 Pump Dimension 57/64" 57/64" 57/64" 57/64" Rod Gauge BT-129 BT-129 BT-129 BT-144 Idle Dimension — — — 49/64" Vent Gauge — — — BT-144 TUNE-UP 1956 1956-57 1957 1958 Spark Plug Gap .033 - .038 .033 - .038 .033 - .038 .033 - .038 Breaker Point Gap SET WITH DWELL METER SET WITH DWELL METER SET WITH DWELL METER .016 Cam Dwell 30° 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. 425 - A.T. "Drive"
	CARBURETOR TOOLS AND GAUGES AS LISTED ARE AVAILABLE THROUGH UMS DISTRIBUTORS
		Rochester Carburetor A GENERAL MOTORS PRODUCT — A UNITED MOTORS LINE
	FORM NO. 1257 I.P.S.	PRINTED IN U.S.A.

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