For 1990-2009 cars

# Information on Revised Connecting Rod Bolt Torque for Small Block GEN III and GEN IV Vortec V8 Engines

Subject: | Information on Revised Connecting Rod Bolt Torque for Small Block GEN III and GEN IV Vortec™ V8 Engines

Models: | 1999-2008 Cadillac Escalade Models

| 2004-2008 Cadillac CTS

| 1997-2008 Chevrolet Corvette (Excluding LS7)

| 1998-2002 Chevrolet Camaro

| 1999 Chevrolet Forward Control Chassis, P32 R/V Van Chassis, P42 Commercial Chassis

| 1999-2008 Chevrolet Express, Silverado (Classic and New Style), Suburban, Tahoe, W-Series Medium Duty Commercial

| 2002-2008 Chevrolet Avalanche

| 2005-2006 Chevrolet SSR

| 2006-2007 Chevrolet Monte Carlo

| 2003-2008 Chevrolet TrailBlazer Models

| 2006-2008 Chevrolet Impala

| 1999-2008 GMC Denali Models, Savana, Sierra (Classic and New Style), Yukon Models, W-Series Medium Duty Commercial

| 2003-2008 GMC Envoy Models

| 1998-2002 Pontiac Firebird Formula, Firebird Trans AM

| 2005-2006 Pontiac GTO, Grand Prix

| 2003-2008 HUMMER H2, H2 SUT

| 2008 HUMMER H3

| 1999-2008 Isuzu N-Series Medium Duty Commercial

| 2005-2008 Saab 9-7X

| with GEN III and GEN IV Vortec™ V8 4.8L, 5.3L, 5.7L, 6.0L or 6.2L Engine (VINs V, C, B, M, T, Z, 8, 3, 0, J, H, N, U, S, Y, K, G, P -- RPOs LR4, LY2, L33, LH6, LH8, LM4, LM7, L59, L92, LC9, LMG, LY5, LS1, LS2, LS4, LS6, LQ4, LQ9, L76, LY6)

A new connecting rod bolt torque specification was introduced to the GEN III and GEN IV Vortec™ small block V8 engines. The connecting rod bolts should continue to be tightened using two passes. The second pass value has been increased from 75 degrees to 85 degrees.

Install the connecting rod bolts and tighten. Refer to Piston, Connecting Rod, and Bearing Installation in SI.

Tighten

• | Tighten the connecting rod bolts a first pass to 20 N·m (15 lb ft).

• | Tighten the connecting rod bolts a final pass to 85 degrees using the J 45059 Angle Meter.