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Cylinder Head - Back View

Fig 1: Cylinder Head Thread Specifications - Back View
GM524587Courtesy 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) Engineering Hole Number
J 42385- MM (IN) MM (IN) -
1 M12 x 1.75 865 856 857 858 859 17 0.670 14 0.551 5011
2 M12 x 1.75 865 856 857 858 859 17 0.670 14 0.551 5010
3 M8 x 1.25 210 206 207 208 209 25 0.984 20 0.787 5031
4 M8 x 1.25 210 206 207 208 209 25 0.984 20 0.787 5030
5 M12 x 1.75 865 856 857 858 859 17 0.670 14 0.551 5310
6 M12 x 1.75 865 856 857 858 859 17 0.670 14 0.551 5020
7 M8 x 1.25 210 206 207 208 209 25 0.984 THRU 5111
8 M8 x 1.25 854
No Flange		 206 207 208 209 25 0.984 THRU 5110

Note: 1, 2, 5, 6 holes are oil passages.

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