Cylinder Head - Back View

WARNING: This page is about a different car, the 2004 Saturn Ion 3, 2004 Saturn Ion 2, and 2004 Saturn Ion 1. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Cylinder Head Thread Specifications - Back View

Courtesy of GENERAL MOTORS CORP.

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.