C 2500 Suburban 2WD V8-8.1L VIN G (2001)
Intake Manifold Gasket: Technical Service Bulletins
Engine - Intake Gasket & Bolts Revised
File In Section: 06 - Engine/Propulsion System
Bulletin No.: 04-06-01-018
Date: June, 2004
INFORMATION
Subject:
Information on Revised Design of Intake Gasket and Related Bolts for 2004 Mid-Year Enhancement and Prior Year Service Usage
Models:
2001-2003 Chevrolet Kodiak 4500/5500
2001-2004 Chevrolet Siverado, Suburban
2002-2004 Chevrolet Avalanche
2001-2003 GMC TopKick 4500/5500
2001-2004 GMC Sierra, Yukon XL
with 8.1L Engine (VINs E, G - RPO L18)
Changes have been made to the 8.1L engine during the 2004 Model Year. The intake gaskets and bolts have been changed. This change adds locating
pins and requires longer bolts as the cylinder head has been updated to accept the pins. All service cylinder heads from GMSPO will be of this updated
style. To aid the technician in diagnosis, the color of the intake manifold to cylinder head bolts has been changed from silver to black.
Refer to the information shown when servicing an 8.1L engine; gaskets should be ordered based on bolt color.
Parts are currently available from GMSPO.
If an engine has one side that uses silver bolts and one that uses black bolts, be sure to replace bolts with the same style.
Important:
Intake manifold bolts should be replaced any time they are removed for servicing.
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