Flex Pipe · ComponentFlange Boltsfor 2003 Chevrolet Astro 4.3L V6 Vortec · RWDUnitslb-ftNmTorque33lb-ft45 NmOther components in Flex PipeCover Screws8 lb-ft · 11 NmExhaust Clamps41 lb-ft · 55 NmHanger Bolts17 lb-ft · 23 NmHeat Shield Bolts12 lb-ft · 16 NmManifold Nuts29 lb-ft · 39 NmMounting Bolts20 lb-ft · 27 NmO2 Sensor40 lb-ft · 54 Nm📝 Suggest a correction to this torque spec