Cylinder Head - Top View

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

Fig 1: Cylinder Head Thread Specifications - Top View

Courtesy of GENERAL MOTORS CORP.

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	M6 x 1.0	205	852	N/A	203	204	24	0.945	20	0.787	2515
2	M6 x 1.0	205	852	N/A	203	204	24	0.945	20	0.787	2514
3	M6 x 1.0	205	201	202	203	204	20	0.787	16	0.630	2812
4	M6 x 1.0	205	201	202	203	204	20	0.787	16	0.630	2820
5	M6 x 1.0	205	201	202	203	204	20	0.787	16	0.630	2710
6	M6 x 1.0	205	852	N/A	203	204	24	0.945	20	0.787	2513
7	M6 x 1.0	205	852	N/A	203	204	24	0.945	20	0.787	2512
8	M8 x 1.25	854 No Flange	206	207	208	209	THRU		THRU		2980
9	M6 x 1.0	205	201	202	203	204	20	0.787	16	0.630	2811
10	M6 x 1.0	205	201	202	203	204	20	0.787	16	0.630	2810
11	M6 x 1.0	205	852	N/A	203	204	24	0.945	20	0.787	2510
12	M6 x 1.0	205	852	N/A	203	204	24	0.945	20	0.787	2511
13	M6 x 1.0	205	201	202	203	204	16	0.630	THRU		2910
14	M6 x 1.0	205	201	202	203	204	16	0.630	THRU		2911
15	M6 x 1.0	205	852	N/A	203	204	24	0.945	20	0.787	2520
16	M6 x 1.0	205	852	N/A	203	204	24	0.945	20	0.787	2521
17	M6 x 1.0	205	201	202	203	204	20	0.787	16	0.630	2815
18	M6 x 1.0	205	201	202	203	204	20	0.787	16	0.630	2816
19	M6 x 1.0	205	852	N/A	203	204	24	0.945	20	0.787	2523
20	M6 x 1.0	205	852	N/A	203	204	24	0.945	20	0.787	2522
21	M6 x 1.0	205	201	202	203	204	20	0.787	16	0.630	2817
22	M6 x 1.0	205	852	N/A	203	204	24	0.945	20	0.787	2525
23	M6 x 1.0	205	852	N/A	203	204	24	0.945	20	0.787	2524
24	M6 x 1.0	205	201	202	203	204	20	0.787	16	0.630	2821
25	M6 x 1.0	205	852	N/A	203	204	24	0.945	20	0.787	2527
26	M6 x 1.0	205	852	N/A	203	204	24	0.945	20	0.787	2526
27	M6 x 1.0	205	201	202	203	204	20	0.787	16	0.630	2818
28	M6 x 1.0	205	201	202	203	204	20	0.787	16	0.630	2822
29	M6 x 1.0	205	852	N/A	203	204	24	0.945	20	0.787	2529
30	M6 x 1.0	205	852	N/A	203	204	24	0.945	20	0.787	2528
31	M6 x 1.0	205	201	202	203	204	20	0.787	16	0.630	2819
32	M6 x 1.0	205	201	202	203	204	20	0.787	16	0.630	2823
33	M8 x 1.25	210	206	207	208	209	25	0.984	20	0.787	2621
34	M8 x 1.25	210	206	207	208	209	25	0.984	20	0.787	2622
35	M8 x 1.25	854 No Flange	853	N/A	208	209	25	0.984	20	0.787	2541
36	M8 x 1.25	854 No Flange	853	N/A	208	209	25	0.984	20	0.787	2540
37	M6 x 1.0	210	206	207	208	209	20	0.787	16	0.630	2814
38	M6 x 1.0	205	852	N/A	203	204	24	0.945	20	0.787	2519
39	M6 x 1.0	205	852	N/A	203	204	24	0.945	20	0.787	2518
40	M6 x 1.0	210	206	207	208	209	20	0.787	16	0.630	2711
41	M6 x 1.0	210	206	207	208	209	20	0.787	16	0.630	2813
42	M6 x 1.0	205	852	N/A	203	204	24	0.945	20	0.787	2517
43	M6 x 1.0	205	852	N/A	203	204	24	0.945	20	0.787	2516