Mike,
There is a tsb on this issue. You can go to this site and see summary info
on all tsb's and recalls for your vehicle. You need to be a member to get
the full tsb info though.
http://alldata.com
There is also a tsb on the engine flush procedure that should be used
before/after repair. # 02-06-01-028
And a new pre-lube tool they should use before firing the engine after
repair. # 02-06-01-008
Copy and paste of the needle bearing tsb is below:
Engine - Needle Bearings Found Upon Oil Change
File In Section: 06 - Engine/Propulsion System
Bulletin No.: 02-06-01-029
Date: September, 2002
INFORMATION
Subject:
Needle Bearings Found in Oil Pan
(Replace Rocker Arms)
Models:
1998-2002 Chevrolet Camaro, Corvette
1998-2002 Pontiac Firebird
2002 Cadillac Escalade, Escalade EXT
1999-2002 Chevrolet Silverado
2000-2002 Chevrolet Suburban, Tahoe
2002 Chevrolet Avalanche
1999-2002 GMC Sierra
2000-2002 GMC Yukon, Yukon XL
2003 HUMMER H2
with 4.8L, 5.3L, 5.7L or 6.0L V8 Engine
(VINs V, T, G, S, U - RPOs LR4, LM7,
LS1, L56, L04, L09)
Condition
Some customers may comment or technicians may notice needle bearings being
found during an engine oil change. The bearings may be found in either the
drain pan used or on the magnetic oil pan drain plug.
Cause
One or more rocker arms may have experienced a bearing failure.
Correction
1. Inspect all of the rocker arms for bearing retainer cap failure. If
one or more defective rocker arms are found, replace all 16 rocker arms.
Refer to the Engine Mechanical sub-section in the appropriate Service
Manual.
2. If no condition with the rocker arms is found, refer to the service
history for previous rocker arm repair. If previous rocker arm repair was
made, then the engine may not have been thoroughly cleaned of loose roller
bearings. If no previous rocker arm repair was made, then look for another
condition.
3. Remove the oil pan and clean out any additional bearings found
within the oil pan. Refer to the Engine Mechanical sub-section in the
appropriate Service Manual.
4. Install the oil pan. Refer to the Engine Mechanical sub-section in
the appropriate Service Manual.
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