Carter Thermo-Quad (TQ) 4 barrel carburetors were used on production vehicles from 1971 thru the mid 1980's. Center section of TQ carburetor is made from molded phenolic resin, which helps insulate fuel from engine heat.
Large and small bore versions were produced. Small bore has 1-3/8" primary throttle bores.
Large bore has 1-1/2" primary throttle bores.