7 millimeters double-D - Dual Jet and Quadra Jet main metering jets
10 millimeters double-D - Dual Jet and Quadra Jet mixture control solenoid-rich screw
The OTC 7667 is designed to adjust settings on computer controlled Rochester, Dual Jet, Quadra Jet, and VaraJet carburetors on carbureted GM engines. Applications: 2mm double-D - VaraJet lean authority screw and idle air bleed; and Dual Jet and Quadra Jet mixture control adjusting screw. 2.5mm hex - Dual Jet and Quadra Jet TPS adjusting screw. 7mm double-D - Dual Jet and Quadra Jet main metering jets. 10mm double-D - Dual Jet and Quadra Jet mixture control solenoid-rich screw.