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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 995 (Engine Mechanical - 8.1L) >> Repair Instructions >> Off-Vehicle Repair Instructions >> Valve Guide Reaming/Valve and Seat Grinding >> Valve Guide Reaming Procedure for Oversized Valve Stems

Valve Guide Reaming Procedure for Oversized Valve Stems

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ream the valve guide as necessary to achieve proper valve stem-to-guide clearance with the new, oversized valve stems.
    2. Fig 1: Reaming Valve Guide
    GM4956Courtesy of GENERAL MOTORS CORP.
  2. Always recondition the valve seat after reaming the valve guide bores or installing new valves.
  3. Replace the cylinder head if the valve guide cannot be repaired or reamed to accept an oversize valve stem.
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