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July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Cylinder Head - End View

Fig 1: Cylinder Head Bolt Holes - End View
GM64503Courtesy of GENERAL MOTORS CORP.
Cylinder Head - End View

Hole Thread Size Insert Drill Counterbore Tool Tap Driver Drill Depth - Maximum mm (in) Tap Depth - Maximum mm (in)
1 M10 x 1.5 J 42385-215 J 42385-211 J 42385-212 J 42385-213 J 42385-214 28.0 (1.10) 20.0 (0.787)
2 - N/A - - - - - -
3 M10 x 1.5 J 42385-215 J 42385-211 J 42385-212 J 42385-213 J 42385-214 28.0 (1.10) 20.0 (0.787)
4 N/A - - - - - - -
5-6 M10 x 1.5 J 42385-215 J 42385-211 J 42385-212 J 42385-213 J 42385-214 28.0 (1.10) 20.0 (0.787)
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