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GMC V6 Carburators

Below is information taken from GMC Maintenance Manuals, Manual X-6423 said to disregard
information found in older manuals, there for that info is listed in the 4th table below.
The information found in manual X-6423 is the same as Early Type listing in X-6523, this
is shown in the 2nd table. Late type information from X-6523 is shown in the 1st table.
Other information for 1966 is shown in the 3rd table. Manual Numbers are shown so as
to tell which manual this information is found in, along with year of use.

What you really should look into is the Holley 500 CFM 2-BBL #4412, this will inprove
your tied old V6 more that replacing the stock Carburator.

Late Type 1965 Carburetors

GMC Engine	Make	Model	GM Part #	Vendor #	Code #	Main Jet	Manual #	Year	Notes
305E V6 305C V6	Bendix Stromberg	WW-Series	2472952	381123	23-160	0.055	X-6523	1965	except L Series
305E V6 305C V6	Bendix Stromberg	WW-Series	2472953	381124	23-161	0.055	X-6523	1965	L3500 L4000
351 V6	Bendix Stromberg	WW-Series	2472954	381126	23-163	0.057	X-6523	1965	except L & SP series
351 V6	Bendix Stromberg	WW-Series	2472955	381127	23-164	0.057	X-6523	1965	L5000
351 V6	Bendix Stromberg	WW-Series	2472956	381128	23-165	0.057	X-6523	1965	SP5000
351 V6	Bendix Stromberg	WW-Series	2472958	381131	23-168	0.057	X-6523	1965	Hydraulic Governor
401 V6	Bendix Stromberg	WWC-Series	2472960	381134	23-171	0.066	X-6534	1965	All H Series
401 V6 478 V6	Bendix Stromberg	WWC-Series	2472961	381135	23-172	0.057	X-6523	1965	SP5000

Early Type 1964-1965 Carburetors

GMC Engine	Make	Model	GM Part #	Vendor #	Code #	Main Jet	Manual #	Year	Notes
153 L4	Carter	~	~	~	~	0.096	X-6423 X-6523	1964 1965	P/PB1000
230 L6	Rochester	7023011 7023017	~	~	~	~	X-6423 X-6523	1964 1965	I1000 I1500 I2500
292 L6	Rochester	7024009	~	~	~	0.072	X-6423 X-6523	1964 1965	P/PB1500 P/PB2500
305E V6	Bendix Stromberg	WW-Series	2453827	381094	23-153A	0.055	X-6423 X-6523	1964 1965	except L-Series
305C V6	Bendix Stromberg	WW-Series	2453827	381094	23-153A	0.055	X-6423 X-6523	1964 1965	except L-Series
305C V6	Bendix Stromberg	WW-Series	2456769	381103	23-158	0.055	X-6423 X-6523	1964 1965	L3500 L4000
351 V6	Bendix Stromberg	WW-Series	2433601	381038	23-137A	0.057	X-6423 X-6523	1964 1965	except L & SP series
351 V6	Bendix Stromberg	WW-Series	2433602	381039	23-138A	0.057	X-6423 X-6523	1964 1965	L4000 L5000
351 V6	Bendix Stromberg	WW-Series	2433603	381040	23-139	0.057	X-6423 X-6523	1964 1965	SP5000
351 V6	Bendix Stromberg	WW-Series	2433606	381043	23-142	0.057	X-6423 X-6523	1964 1965	Hydraulic Governor
401 V6	Bendix Stromberg	WWC-Series	2440817	381064	23-147	0.066	X-6423 X-6434	1964	except W5000 SP5000
401 V6	Bendix Stromberg	WWC-Series	2433601	381038	23-137A	0.057	X-6423	1964	W5000
401 V6	Bendix Stromberg	WWC-Series	2441975	381066	23-149	0.068	X-6423	1964	SP5000
478 V6	Bendix Stromberg	WWC-Series	2441975	381066	23-149	0.068	X-6423	1964	SP5000
478 V6	Bendix Stromberg	WWC-Series	2440818	381065	23-148	0.067	X-6434	1964	6500
702 V12	Bendix Stromberg	WW-Series	2433607	381044	23-143	0.052	X-6434	1964	uses 2 7000

1966 Carburetors

GMC Engine	Make	Model	GM Part #	Vendor #	Code #	Main Jet	Manual #	Year	Notes
305C V6	Bendix Stromberg	WW-Series	2485214	381164	23-181	0.055	X-6634	1966	HM-5500
351C V6	Bendix Stromberg	WW-Series	2485215	381165	23-182	0.056	X-6634	1966	HM-5500 HM/JM-7500
351C V6	Bendix Stromberg	WW-Series	2472955	381127	23-164	0.056	X-6634	1966	TM-7500
351M V6	Bendix Stromberg	WW-Series	2487147	381168	23-185	0.065	X-6634	1966	RM-7500
351M V6	Bendix Stromberg	WW-Series	2483900	381167	23-184	0.065	X-6634	1966	HM/JM/TM-7500 HM/TM-8500
401M V6	Bendix Stromberg	WW-Series	2483900	381167	23-184	0.065	X-6634	1966	HM/JM/TM-7500 HM/TM/JM/WM-8500
401M V6	Bendix Stromberg	WW-Series	2487147	381168	23-188	0.065	X-6634	1966	RM-7500
478M V6	Bendix Stromberg	WW-Series	2487147	381168	23-185	0.065	X-6634	1966	RM-7500
478M V6	Bendix Stromberg	WW-Series	2483900	381167	23-184	0.065	X-6634	1966	HM/JM/TM/WM-8500
637 V8	Bendix Stromberg	WW-Series	2492166	381177	~	0.075	X-6634	1966	All-9500

1960-1963 Carburetors

GMC Engine	Make	Model	GM Part #	Vendor #	Code #	Main Jet	Manual #	Year	Notes
305A V6	Holley	1904	2382769	R-1915-A		#66	X-6023	1960
305B V6	Zenith	228BV12	2399093	0-12489		#32	X-6023	1960
305C V6	Bendix Stromberg	WW-2	2391843 2391844	380977 380980	23-123A 23-124A	0.057	X-6023	1960
351 V6	Bendix Stromberg	WW-2	2382770 2382773 2382774	380972 380973 380974	23-120A 23-121A 23-122A	0.057	X-6023	1960
401 V6	Bendix Stromberg	WWC-3	2382772	380978	23-125	0.071	X-6034	1960
702 V12	Bendix Stromberg	WW-2	2382773	380979	23-126B	0.052	X-6034	1960	uses 2 7000
305C V6 305D V6	Bendix Stromberg	WW-Series	2427805	381031	23-133A	0.055	X-6223	1962	except L-4000
305C V6	Bendix Stromberg	WW-Series	2427807	381033	23-135A	0.055	X-6223	1962	L-4000
351 V6	Bendix Stromberg	WW-Series	2433601	381038	23-137	0.057	X-6223	1962	except L-5000 SP-5000
351 V6	Bendix Stromberg	WW-Series	2433602	381039	23-138	0.057	X-6223	1962	L-5000
351 V6	Bendix Stromberg	WW-Series	2433603	381040	23-139	0.057	X-6223	1962	SP-5000
401 V6	Bendix Stromberg	WW-Series	2433608	381045	23-144	0.071	X-6223	1962
305E V6	Bendix Stromberg	WW-Series	2445281	381076	23-151	0.055	X-6323	1963	1000 to 3500
305C V6	Bendix Stromberg	WW-Series	2445281	381076	23-151	0.055	X-6323	1963	4000 except L & LH-4000
305C V6	Bendix Stromberg	WW-Series	2445282	381077	23-152	0.055	X-6323	1963	L & LH-4000
351 V6	Bendix Stromberg	WW-Series	2433601	381038	23-137	0.057	X-6323	1963	5000 except L & LH-5000
351 V6	Bendix Stromberg	WW-Series	2433602	381039	23-138	0.057	X-6323	1963	L & LH-5000
351 V6	Bendix Stromberg	WW-Series	2433603	381040	23-139	0.057	X-6323	1963	SP-5000
351 V6	Bendix Stromberg	WW-Series	2433606	381043	23-142	0.057	X-6323	1963	Hydraulic Governor
401 V6	Bendix Stromberg	WW-Series	2440817	381064	23-147	0.066	X-6323	1963
478 V6	Bendix Stromberg	WW-Series	2440818	381065	23-148	0.067	X-6334	1963
702 V12	Bendix Stromberg	WW-Series	2433607	381044	23-143	0.052	X-6334	1963	uses 2 7000

Information About GMC Truck Drive Trains

GMC Big Block V6	1960-1966 GMC Drive-Train Data Pages	GMC Twin-Six V12
1960-1974 GMC V6 Engines Page #1	1960-1974 GMC V6 & V12 Engine Data	GMC's Twin-Six V-12 Engine!
1960-1974 GMC V6 Engines Page #2	1960-1966 GMC's Inline 6 Engines	GMC Twin-Six V12 Engines
GMC Plaid Valve Covers	GMC Diesel Engine Data Page	GMC Twin-Six V12 Myths
GMC V6 Performance Upgrades	Carburator Data Page	1965 Article GMC Irrigation Engines
GMC 351 V6 Engines	GMC Toro-Flow Diesels	Powered by GMC V6/V12 Engines
GMC 401 Magnum V6 Engines	GMC Transmission Data	Known Good Part Numbers
GMC 478 V6 Engines	GMC Drive Axle Data	Spicer 5831 Aux Transmission

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