Cylinder Head - Back View

Fig 1: Cylinder Head - Back View

GM524587

Courtesy 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-							MM	(IN)	MM	(IN)
1	M12 x 1.75	865	856	857	858	859	17	0.670	14	0.551
2	M12 x 1.75	865	856	857	858	859	17	0.670	14	0.551
3	M8 x 1.25	210	206	207	208	209	25	0.984	20	0.787
4	M8 x 1.25	210	206	207	208	209	25	0.984	20	0.787
5	M12 x 1.75	865	856	857	858	859	17	0.670	14	0.551
6	M12 x 1.75	865	856	857	858	859	17	0.670	14	0.551
7	M8 x 1.25	210	206	207	208	209	25	0.984	THRU
8	M8 x 1.25	854 No Flange	206	207	208	209	25	0.984	THRU

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