1998-2000 GMC Envoy Downpipe Torque Specs

4.3L V6 Vortec

Applies to 1998, 1999, and 2000 GMC Envoy

Labor Time:2 hours

🔧 Torque Values7 specifications

Component	lb-ft	Nm	Notes
Cover Screws	8	11	—
⚠️ Flange Bolts	40	54	Apply anti-seize
Hanger Bolts	17	23	—
Heat Shield Bolts	12	16	—
⚠️ Manifold Nuts	29	39	Apply anti-seize
Mounting Bolts	20	27	—
⚠️ O2 Sensor	40	54	Apply anti-seize to threads

⚠️ = Critical torque value | Always verify with vehicle-specific service manual

⚠️ Some critical specs are estimated. Please verify sequence.

1990-1997 4.6L V8 Modular

2007-2012 3.7L I5

2011-2016 6.7L V8 Power Stroke Diesel

2022-2024 GT-Line Dual Motor AWD

1992-1995 1.5L I4 D15

2016-2023 2.0L Turbo I4

The primary torque specification for downpipe on a 1998-2000 GMC Envoy is 11 Nm (8 lb-ft).

There are 7 torque specifications for downpipe on the 1998-2000 GMC Envoy 4.3L V6 Vortec, covering all related fasteners and components.