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Cylinder Head - Top View

Fig 1: Identifying Bolt Sizes & Locations On Cylinder Head - Top
GM1492394Courtesy of GENERAL MOTORS CORP.
Cylinder Head - Top View

Service Call Out Thread Size Insert Drill Counterbore Tool Tap Driver Drill Depth (Maximum) Tap Depth (Maximum)
J 42385-850 MM (IN) MM (IN)
1 M6 x 1 205 852 N/A 203 204 24 0.945 20 0.787
2 M6 x 1 205 201 202 203 204 20 0.787 16 0.63
3 M8 x 1.25 854 206 207 208 209 THRU THRU
4 M8 x 1.25 854 853 N/A 208 209 25 0.984 20 0.787
5 M8 x 1.25 210 206 207 208 209 25 0.984 20 0.787
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