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GM Cylinder Head Tightening Specification Clarification
This bulletin was issued to clarify GM 4.0L and 4.6L cylinder head tightening specifications found in previously published service manuals.
1993 Cadillac Allante, Sixty Special (FWD)
1993-96 Cadillac Fleetwood
1993-99 Cadillac DeVille, Eldorado, Seville
1994-99 Cadillac Concours
1995-99 Oldsmobile Aurora
with 4.0 L or 4.6 L Engine (VINs C, Y, 9 - RPOs L47, LD8, L37)
Cylinder Head Installation
Torque specification and sequence for the cylinder head bolts (1-10) using a torque angle meter (J 36660-A):
1. First Pass - 30 ft.lbs. (40 N-m)
2. Second Pass - 70 Degrees
3. Third Pass - 60 Degrees
4. Fourth Pass - 60 Degrees (190 Degrees total)
The torque specification for the three front M6 cylinder head bolts is:
106 in.lbs. (12 N-m)
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.
Thanks for the info for this Engine Blocks & Cylinder Heads specifications. This is a great guide for Cadillac owners.
by: engineman 5/17/2011