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General Motors — connecting rod. Mark piston in relation to connecting rod before separating

A General Motors service procedure — check it applies to your exact model before use.

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Procedure

  1. Replace piston and piston pin as matched set. Install piston in bore with notch on top of
  2. Measure piston diameter at 90-degree angle to piston pin, on piston pin center line.
  3. If piston clearance is not within specification, replace piston and/or machine cylinder

Source: manual:1995 ENGINE 4.3L VIN W_text.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.