Stromberg WW Carburetors for GMC Trucks
Top view of a Stromberg WWC carburetor
Until 1966 GMC light trucks used mostly GMC engines; after that they shared drive trains with Chevrolet. Medium and heavy duty GMC trucks used their own gasoline engines until 1974.
In the 1960s and 70s these were mostly V6 engines ranging in size from 305 CID to 478 CID; there was also a 503 CID straight 6, a 637 CID V8 and a 702 CID V12. All of the V6 and V12 engines used Stromberg WW or WWC carburetors; the V12 used two of them. We have complete listings of GMC carburetor kits and parts here.
The Stromberg WW-series came in two main variations, the WW and WWC. The WW is the smaller of the two, and is often mistaken for a Carter BBD carburetor. In fact, Stromberg WWs and Carter BBDs were used interchangeably on Mopar applications.
Front view of the smaller Stromberg WW carburetor
One quick way to tell a WW carburetor is that it has a large accelerator pump lever across the top of the carb. WWC carbs don’t have this lever.
There are many versions of these carbs that look similar, so it’s essential to check the carb number when ordering a kit. The carb number appears on these in a couple of different places. As shown in the pictures, it’s often on a round tag that looks like a washer on the top of the carb. This will usually have the vendor number shown in the table below. Sometimes there is a conventional tag with a GMC number. In many cases there is a ‘Code number’ stamped onto the top part of the carburetor – on the flat area on the float bowl cover.
All WW carburetors use our F77 float, listed here. Unfortunately, there aren’t any new floats for the larger WWC carburetor.
Rochester Model B Design Features Summary
| Year | Engine | Type | GM Part No. | Vendor No. | Code No. | Notes | Carb Kit | Float |
| 1960 | 305C V6 | WW-2 | 2391843 2391844 | 380977 380980 | 23-123A 23-124A | CK4491 | F77 | |
| 1960 | 351 V6 | WW-2 | 2382770 2382773 2382774 | 380972 380973 380974 | 23-120A 23-121A 23-122A | CK4491 | F77 | |
| 1960 | 401 V6 | WWC-3 | 2382772 | 380978 | 23-125 | CK738 | ||
| 1960 | 702 V12 | WW-2 | 2382773 | 380979 | 23-126B | uses 2 7000 | CK4491 | F77 |
| 1962 | 305C V6 305D V6 | WW | 2427805 | 381031 | 23-133A | except L-4000 | CK4491 | F77 |
| 1962 | 305C V6 | WW | 2427807 | 381033 | 23-135A | L-4000 | CK4491 | F77 |
| 1962 | 351 V6 | WW | 2433601 | 381038 | 23-137 | except L-5000 SP-5000 | CK4491 | F77 |
| 1962 | 351 V6 | WW | 2433602 | 381039 | 23-138 | L-5000 | CK4491 | F77 |
| 1962 | 351 V6 | WW | 2433603 | 381040 | 23-139 | SP-5000 | CK4491 | F77 |
| 1962 | 401 V6 | WW | 2433608 | 381045 | 23-144 | F77 | ||
| 1963 | 305E V6 | WW | 2445281 | 381076 | 23-151 | 1000 to 3500 | CK4491 | F77 |
| 1963 | 305C V6 | WW | 2445281 | 381076 | 23-151 | 4000 except L & LH-4000 | CK4491 | F77 |
| 1963 | 305C V6 | WW | 2445282 | 381077 | 23-152 | L & LH-4000 | CK4491 | F77 |
| 1963 | 351 V6 | WW | 2433601 | 381038 | 23-137 | 5000 except L & LH-5000 | CK4491 | F77 |
| 1963 | 351 V6 | WW | 2433602 | 381039 | 23-138 | L & LH-5000 | CK4491 | F77 |
| 1963 | 351 V6 | WW | 2433603 | 381040 | 23-139 | SP-5000 | CK4491 | F77 |
| 1963 | 351 V6 | WW | 2433606 | 381043 | 23-142 | Hydraulic Governor | CK4491 | F77 |
| 1963 | 401 V6 | WW | 2440817 | 381064 | 23-147 | CK738 | F77 | |
| 1963 | 478 V6 | WW | 2440818 | 381065 | 23-148 | CK738 | F77 | |
| 1963 | 702 V12 | WW | 2433607 | 381044 | 23-143 | uses 2 7000 | CK4491 | F77 |
| 1964 1965 | 305E V6 | WW | 2453827 | 381094 | 23-153A | except L-Series | CK529 | F77 |
| 1964 1965 | 305C V6 | WW | 2453827 | 381094 | 23-153A | except L-Series | CK529 | F77 |
| 1964 1965 | 305C V6 | WW | 2456769 | 381103 | 23-158 | L3500 L4000 | CK529 | F77 |
| 1964 1965 | 351 V6 | WW | 2433601 | 381038 | 23-137A | except L & SP series | CK4491 | F77 |
| 1964 1965 | 351 V6 | WW | 2433602 | 381039 | 23-138A | L4000 L5000 | CK4491 | F77 |
| 1964 1965 | 351 V6 | WW | 2433603 | 381040 | 23-139 | SP5000 | CK4491 | F77 |
| 1964 1965 | 351 V6 | WW | 2433606 | 381043 | 23-142 | Hydraulic Governor | CK4491 | F77 |
| 1964 | 401 V6 | WWC | 2440817 | 381064 | 23-147 | except W5000 SP5000 | CK738 | |
| 1964 | 401 V6 | WWC | 2433601 | 381038 | 23-137A | W5000 | CK4491 | |
| 1964 | 401 V6 | WWC | 2441975 | 381066 | 23-149 | SP5000 | CK738 | |
| 1964 | 478 V6 | WWC | 2441975 | 381066 | 23-149 | SP5000 | CK738 | |
| 1964 | 478 V6 | WWC | 2440818 | 381065 | 23-148 | 6500 | CK738 | |
| 1964 | 702 V12 | WW | 2433607 | 381044 | 23-143 | uses 2 7000 | CK4491 | F77 |
| 1965 | 305E V6 305C V6 | WW | 2472952 | 381123 | 23-160 | except L Series | CK5253 | F77 |
| 1965 | 305E V6 305C V6 | WW | 2472953 | 381124 | 23-161 | L3500 L4000 | CK5253 | F77 |
| 1965 | 351 V6 | WW | 2472954 | 381126 | 23-163 | except L & SP series | CK4491 | F77 |
| 1965 | 351 V6 | WW | 2472955 | 381127 | 23-164 | L5000 | CK4491 | F77 |
| 1965 | 351 V6 | WW | 2472956 | 381128 | 23-165 | SP5000 | CK4491 | F77 |
| 1965 | 351 V6 | WW | 2472958 | 381131 | 23-168 | Hydraulic Governor | CK4491 | F77 |
| 1965 | 401 V6 | WWC | 2472960 | 381134 | 23-171 | All H Series | CK738 | |
| 1965 | 401 V6 478 V6 | WWC | 2472961 | 381135 | 23-172 | SP5000 | CK738 | |
| 1966 | 305C V6 | WW | 2485214 | 381164 | 23-181 | HM-5500 | CK5253 | F77 |
| 1966 | 351C V6 | WW | 2485215 | 381165 | 23-182 | HM-5500 HM/JM-7500 | CK4491 | F77 |
| 1966 | 351C V6 | WW | 2472955 | 381127 | 23-164 | TM-7500 | CK4491 | F77 |
| 1966 | 351M V6 | WW | 2487147 | 381168 | 23-185 | RM-7500 | CK738 | F77 |
| 1966 | 351M V6 | WW | 2483900 | 381167 | 23-184 | HM/JM/TM-7500 HM/TM-8500 | CK738 | F77 |
| 1966 | 401M V6 | WW | 2483900 | 381167 | 23-184 | HM/JM/TM-7500 HM/TM/JM/WM-8500 | CK738 | F77 |
| 1966 | 401M V6 | WW | 2487147 | 381168 | 23-188 | RM-7500 | CK738 | F77 |
| 1966 | 478M V6 | WW | 2487147 | 381168 | 23-185 | RM-7500 | CK738 | F77 |
| 1966 | 478M V6 | WW | 2483900 | 381167 | 23-184 | HM/JM/TM/WM-8500 | CK738 | F77 |
| 1966 | 637 V8 | WW | 2492166 | 381177 | All-9500 | F77 |
