Parts by Quadrajet Model
Model 4MC Quadrajet Parts
Model 4MC QJets have a hot air-operated choke coil mounted on the side of the float bowl. A few marine units were built with an electric choke, model 4ME. Automotive model 4MCs were used from 1965-1974. Notable applications include Pontiac and Oldsmobile engines, including the GMC motorhome.
Model 4MV Quadrajet Parts
Model 4MV QJets have a manifold-mounted (crossover) choke which is connected to the carburetor with a rod. These were used in cars from 1966 to 1974, in trucks up to 1979 and in marine applications into the 1990s. Rochester, Carter and Edelbrock versions were produced.
Model M4MC Quadrajet Parts
Model M4MC QJets have a hot air-operated choke coil mounted on the side of the float bowl. These were produced starting in 1975 and have different body castings from the earlier models, as well as shorter metering rods than 4M carburetors.
Model M4ME-M4MED-M4MEF Quadrajet Parts
Model M4ME QJets have an electric choke mounted on the side of the carb but are otherwise similar to the M4MC. M4MED carbs have a dual-capacity pump solenoid on the top passenger side. These have a gray, two wire electrical connector. The M4MEF carburetor has an adjustable air bleed on the secondary side and uses different gaskets from regular M4ME models. These were used on 1985-1990 1 ton trucks and RVs.
Model E4MC-E4ME-E4MED Quadrajet Parts
Model E4M carbs are a computer-controlled, feedback version of the QJet. They all have a mixture control solenoid with a 3-wire blue or black connector on the top passenger side, as well as a throttle postion sensor on the front driver's side. These carburetors were built with either hot air (E4MC) chokes or electric (E4ME). Some California models also had a dual capacity pump solenoid (E4MED).