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This 2001 GM 4.8L Vortec V8 LR4 engine uses a rev...
Revised Rod Bolt Torque Specifications For GM Vortec V8 Engines
New connecting rod bolt torque spec for 1997-2008 small block Gen III and Gen IV Vortec V8s increases tightening angle.
When working on Gen III and Gen IV Vortec 4.8L, 5.3L, 5.7L, 6.0L and
6.2L V8 engines you should follow a new connecting rod bolt torque
specification. The rod bolts should continue to be tightened using two
The new specification calls for the second pass value to be increased from 75 to 85 degrees, following this procedure:
1. Tighten the connecting rod bolts a first pass to 15 ft.lbs. (20 Nm)
2. Tighten the connecting rod bolts a final pass to 85 degrees using the J 45059 Angle Meter.
Some or all of this information was provided by the Automotive
Parts Remanufacturers Association (APRA). For more information on
technical bulletins available through APRA call 703-968-2772 or visit www.AutoBulletins.com.