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Engine Block - Top View

Fig 1: Engine Block Bolt Holes - Top View
GM64573Courtesy of GENERAL MOTORS CORP.
Engine Block - Top View

Hole Thread Size Insert Drill Counterbore Tool Tap Driver Drill Depth - Maximum mm (in) Tap Depth - Maximum mm (in)
1-4 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)
5 M16 x 1.5 - - - - - - -
6-7 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)
8 M10 x 1.5 J 42385-216 J 42385-211 J 42385-212 J 42385-213 J 42385-214 22.5 (0.885) 17.0 (0.669)
9-10 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)
11 M10 x 1.5 J 42385-216 J 42385-211 J 42385-212 J 42385-213 J 42385-214 22.5 (0.885) 17.0 (0.669)
12-14 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)