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Fitting Pistons

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Measure cylinder bore diameter .79" (20 mm), 3.8" (96 mm) and 6.1" (155 mm) below cylinder block deck surface. Measure piston diameter at 90-degree angle to piston pin and on pin center line.
  2. Determine piston clearance. See PISTONS, PINS & RINGS  and CYLINDER BLOCK  tables under ENGINE SPECIFICATIONS. If clearance is not within specification, replace piston and/or machine cylinder bore.
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