Torque Specs
Torque Specs This is a newbie question but search didnt work for me. Im installing some headers but dont know the torque spec for the header bolts. What would you guys recommend? Also would you recommend threadlock?
Any help would be appreciated.
Any help would be appreciated.
Last edited by lilpb1; Apr 6, 2009 at 06:53 PM. Reason: add more info.
Spec's straight from GM via Alldata
Notes
Bulletin No.: 06-06-01-026
Date: December 22, 2006
INFORMATION
Subject:
L59, LR4, LM4, LM7, LQ4, LQ9, LS1, LS6 New Exhaust Manifold Bolts and Torque Specifications for GEN III Vortec(TM) Engine
Models:
1999-2003 Cadillac Escalade
1999 Chevrolet Forward Control Chassis, P32 R/V Van Chassis, P42 Commercial Chassis
1998-2002 Chevrolet Camaro
1999-2003 Chevrolet Corvette, Express, Silverado, Suburban, Tahoe, W-Series Medium Duty Truck
1999 GMC Forward Control Chassis, P32 R/V Van Chassis, P42 Commercial Chassis
1999-2003 GMC Savana, Siera, Yukon, W-Series Medium Duty Truck
2003 GMC Siera Denali
1998-2002 Pontiac Firebird Formula, Firebird Trans Am
2003 HUMMER H2
1999-2003 Isuzu N-Series Medium Duty Truck
with GEN III Vortec(TM) Engine (VINs V, G, P, S, T, N, U, Z, - RPOs 4.8L, 5.3L, 5.7L, 6.0L)
A new exhaust manifold bolt and torque specification was introduced to the GEN III Vortec(TM) small block V8 engines beginning with the 2004 model year. When servicing any GEN III Vortec(TM) small bock exhaust manifolds, the exhaust manifold bolts should be replaced.
- P/N 11518860 Exhaust Manifold Bolts
Apply a 5 mm (0.2 in) wide bead of high temperature threadlocker to the threads of the exhaust manifold bolts before installing.
- P/N 12345493 - GM High Temperature High Strength Threadlocker (U.S.)
- P/N 10953488 - GM High Temperature High Strength Threadlocker (Canada)
When tightening the exhaust manifold bolts it should be done with two passes. First tighten the two center bolts on the exhaust manifold. Then tighten the rest of the bolts, alternating from side to side, while working towards the outside bolts.
Install the exhaust manifold bolts.
Refer to the following torque sequence:
Tighten
Tighten to 10 N.m (89 lb in) on the first pass.
Tighten to 20 N.m (15 lb ft) on the final pass.
Notes
Bulletin No.: 06-06-01-026
Date: December 22, 2006
INFORMATION
Subject:
L59, LR4, LM4, LM7, LQ4, LQ9, LS1, LS6 New Exhaust Manifold Bolts and Torque Specifications for GEN III Vortec(TM) Engine
Models:
1999-2003 Cadillac Escalade
1999 Chevrolet Forward Control Chassis, P32 R/V Van Chassis, P42 Commercial Chassis
1998-2002 Chevrolet Camaro
1999-2003 Chevrolet Corvette, Express, Silverado, Suburban, Tahoe, W-Series Medium Duty Truck
1999 GMC Forward Control Chassis, P32 R/V Van Chassis, P42 Commercial Chassis
1999-2003 GMC Savana, Siera, Yukon, W-Series Medium Duty Truck
2003 GMC Siera Denali
1998-2002 Pontiac Firebird Formula, Firebird Trans Am
2003 HUMMER H2
1999-2003 Isuzu N-Series Medium Duty Truck
with GEN III Vortec(TM) Engine (VINs V, G, P, S, T, N, U, Z, - RPOs 4.8L, 5.3L, 5.7L, 6.0L)
A new exhaust manifold bolt and torque specification was introduced to the GEN III Vortec(TM) small block V8 engines beginning with the 2004 model year. When servicing any GEN III Vortec(TM) small bock exhaust manifolds, the exhaust manifold bolts should be replaced.
- P/N 11518860 Exhaust Manifold Bolts
Apply a 5 mm (0.2 in) wide bead of high temperature threadlocker to the threads of the exhaust manifold bolts before installing.
- P/N 12345493 - GM High Temperature High Strength Threadlocker (U.S.)
- P/N 10953488 - GM High Temperature High Strength Threadlocker (Canada)
When tightening the exhaust manifold bolts it should be done with two passes. First tighten the two center bolts on the exhaust manifold. Then tighten the rest of the bolts, alternating from side to side, while working towards the outside bolts.
Install the exhaust manifold bolts.
Refer to the following torque sequence:
Tighten
Tighten to 10 N.m (89 lb in) on the first pass.
Tighten to 20 N.m (15 lb ft) on the final pass.
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