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Cylinder Head - Top View

Fig 1: Cylinder Head Bolt Holes - Top View
GM260168Courtesy of GENERAL MOTORS CORP.
Cylinder Head - Top View

Hole Thread Size Insert Drill Counterbore Tool Tap Driver Drill Depth - Maximum mm (in) Tap Depth - Maximum mm (in)
1-5 M8 x 1.25 J 42385-210 J 42385-206 J 42385-207 J 42385-208 J 42385-209 26.5 (1.04) 19.0 (0.784)
6-9 M6 x 1.0 J 42385-205 J 42385-201 J 42385-202 J 42385-203 J 42385-204 20.05 (0.789) 16.05 (0.632)
10-12 M8 x 1.25 J 42385-210 J 42385-206 J 42385-207 J 42385-208 J 42385-209 26.5 (1.04) 19.0 (0.784)
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