Carter TQ Metering Jets

Type one: Press in jets slip into their orifice with an o-ring seal. Use a pair of pliers and slight twisting motion to remove and install these jets. The pressing jets were used on the competition series TQ 850 and 1000 CFM models.

Type two: Primary threaded jets are identifiable by the screw driver slot in the top of the jet, do not try to remove these with pliers. These jets all use a 120-xxxx number ranging from 120-3074 to 120-3092 graduating by .003". When looking at the last four digits of the jet marking, the final three numbers are the jet orifice size, ie 120-3074 would have a .074" orifice. Secondary threaded jets are also identifiable by the screw driver slot in the top of the jet. Secondary part numbers start at 120-3110 and range to 120-3131 stepping up in .003" increments. As with the primary jets, the final three numbers on the secondary jets indicates the orifice size, ie 120-3131 has a .131" orifice. Type two and three threaded jets were used in CS TQ's 850 and 1000 CFM and as original equipment on the 1971 340 CID Chrysler cars. 

Type three: These are referred to as 'solid fuel' jets. They are found in original equipment 1972 340 and 400 CID Chrysler cars. At the time of publication, these jets were only manufactured in two sizes, primary: 120-4095 (.095") and secondary: 120-4137 (.137").