RCB 9D-1

ROCHESTER CARBURETORS

Bulletin 9D-1 March 1, 1954

ROCHESTER PRODUCTS CARBURETORS

SERVICE BULLETIN CARBURETOR SPECIFICATIONS

BULLETIN 9D1

DATE 3-1-54 PAGE 1


ITEM	CHEVROLET	CHEVROLET	CHEVROLET	CHEVROLET	CHEVROLET	CHEVROLET	CHEVROLET	CHEVROLET	CHEVROLET
Carburetor Part No.	7001374	7002050 7003152	7002051	7003060 7003160	7003526	7003863 7003865	7003864	7003986 7004495	7004468
Manufacturers Year	1937-40	1949-51	1950-51	1950-51	1952	1951	1951	1951	1953-54
Carburetor Model	B	B	B	B	BC	B	B	B	B
SAE Flange Size	1-1/4"	1-1/4"	I-1/2"	I-1/2"	1-1/2"	1-1/4"	1-1/2"	1-1/2"	1-1/2"
Bore Diameter	1-1/2"	1-1/2"	1-9/16"	1-9/16"	1-9/16"	1-1/2"		1-9/16"	1-9/16"
Primary Venturi	1-7/32"	1-7/32"	1-11/32"	l-11/32"	1-11/32"	1-7/2"	1-11/32"	1-11/32"	l"/32"
Secondary Venturi	9/16"	9/16"	19/32"	19/32"	1-9/32"	1-9/16"	19/32"	19/32"	19/32"
Nozzle Restriction	.144"	.144"	.161"	.161"	.152"	.144"	.161"	.152"	.161"
Main Metering Jet-Lean	7002651 .051"	7002650 .050"	7002657 .057"	7002657 .057"	7002656 .056"	7002650 .050"	7002657 .057"	7001860 .055"	7002957 .057"
Main Metering Jet-Std.	7002652 .052"	7002651 .051"	7002658 .058"	7002658.058"	7002657 .057"	7002651 .051"	7002658 .058"	7002656 .056"	7002958 .058"
Main Metering Jet-Rich	7002653 .053"	7002652 ,052"	7002659 .059"	7002659 .059"	7002658 .059"	7002652 .052"	7002659.059"	7002657 .057"	7002959 .059"
Main Air Bleed	Two-.028"	Two-.028"	Two-.028"	Two-.028"	Two-.028"	Two-.028"	Two-,028"	Two-.028"	Two .028"
Fuel Valve Seat Diameter	.086"	.086"	.086"	.086"	.086"	.086"	.086"	.086"	.086"
Float Level	(A) 1-9/32"	(A) 1-9/32"	(A) 1-9/32"	(A) 1-9/32"	(A) 1-9/32"	(A) 1-9/32"	(A) 1-9/32"	(A) 1-9/32"	(A) 1-9/32"
Float Drop	(B) 1-3/4"	(B) 1-3/4"	(B) 1-3/4"	(B) 1-3/4"	(B) 1-3/4"	(B) 1-3/4"	(B) 1-3/4"	(B) 1-3/4"	(B) 1-3/4"
Idle Tube Restriction	.093"	.082"	.061"	.061"	.063"	.082"	.061"	.063"	.070"
Idle Bleed	.046"	.046"	.046"	.046"	.028"	.046"	.046"	.028"	.028"
Idle Adjusting Needle	7002357 30°	7002357 30°	7002357 30°	7002357 30°	7002357 30°	7002357 30°	7002357 30°	7002357 30°	7002357 30°
Idle Needle Orifice	.063"	.063"	.067"	.067"	.073"	.063"	.081"	.073"	.073"
Secondary Idle Hole—Lower	.034"	.034"	.031"	.031"	.040"	.034"	.033"	.040"	.042"
Secondary Idle Hole—Center	.031"	.031"	-------	-------	-------	.031"	--------	-------	-------
Secondary Idle Hole—Upper	.028"	.028"	-------	------	.028"	.028"	.031"	.028"	.032"
Spark Port	Two -.040"	Two .040"	Two-.040"	Two-.040"	Two-.040"	Two-.040"	Two-.040"	Two-.040"	Two-.040"
Power Restriction	.030"	.039"	.040"	.041"	.046"	.039"	.040"	.046"	.043"
Power Spring	7002071	7002071	7002366	7002366	7002366	7002071	7002366	7002366	7002366
Spring Color	Zinc Plated	Zinc Plated	Red	Red	Red	Zinc Plated	Red	Red	Red
Pump Jet Orifice	.028"	.028"	.031"	.031"	.031"	.028"	.031"	.031"	.031"
Pump Link lor rod)	7005136	7005136	7005136	7005136	7005136	7005136	7005136	7005136	7005136
CC per 10 Strokes	12-16	12-16	12-16	12-16	12-16	12-16	12-16	12-16	12-16
Choke Coil Setting	--------	-------	-------	-------	Index	-------	-------	-------	-------
Fuel Valve & Seat Assy-	7002359	7002359	7002359	7002359	7002359	7002359	7002359	7002359	7002359
Air Horn Gasket	7002894	7002894	7002894	7002894	7004480	7004480	7004480	7004480	7004480
Gasket Kit	7001386	7001386	7001386	7001386	7004085	7004595	7004595	7004595	7004595
Repair Kit	7004363	7004363	7004363	7004363	7004363	7004363	7004363	7004363	7004363

NOTE: (A) Use Float Level Setting Gauge M-250 for all Chevrolet carburetors.

NOTE: (B) Use Float Drop Setting Gauge BT-93. Float drop is measured from bottom of gasket surface to bottom of floats with air horn held upright and floats freely suspended.

All tools and gauges are available through United Motor Service Distributors

GO, WD, WDCC. 31, 38