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Cylinder Head - Back View

Fig 1: Identifying Bolt Size & Locations On Cylinder Head - Back
GM1492398Courtesy of GENERAL MOTORS CORP.
Cylinder Head - Back 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 M8 x 1.25 210 206 207 208 209 25 0.984 20 0.787
2 M12 x 1.75 865 856 857 858 859 17 0.67 14 0.551
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