Cylinder Head - Top View

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Fig 1: Cylinder Head - Top View

Courtesy of GENERAL MOTORS CORP.

Service Hole Location	Thread Size	Drill	Counterbore Tool	Stop Collar	Tap	Driver	Insert	Drill Depth (Max)		Tap Depth (Min)
-								mm	(in)	mm	(in)
1	M 6 x 1	405	n/a	406	203	204	205	28	1.103	24	0.945
2	M 6 x 1	201	202	n/a	203	204	205	22	0.866	18	0.709
3	M 6 x 1	405	n/a	406	203	204	205	28	1.103	24	0.945
4	M 6 x 1	405	n/a	407	203	204	205	THRU		THRU
5	M 6 x 1	201	202	n/a	203	204	205	22	0.866	18	0.709
6	M 6 x 1	405	n/a	406	203	204	205	28	1.103	24	0.945
7	M 6 x 1	405	n/a	406	203	204	205	28	1.103	24	0.945
8	M 6 x 1	405	n/a	407	203	204	205	THRU		THRU
9	M 6 x 1	201	202	n/a	203	204	205	22	0.866	18	0.709
10	M 6 x 1	405	n/a	406	203	204	205	28	1.103	24	0.945
11	M 6 x 1	405	n/a	406	203	204	205	28	1.103	24	0.945
12	M 6 x 1	201	202	n/a	203	204	205	22	0.866	18	0.709
13	M 6 x 1	405	n/a	406	203	204	205	28	1.103	24	0.945
14	M 6 x 1	405	n/a	406	203	204	205	28	1.103	24	0.945
15	M 6 x 1	405	n/a	407	203	204	205	THRU		THRU
16	M 6 x 1	201	202	n/a	203	204	205	22	0.866	18	0.709
17	M 6 x 1	405	n/a	406	203	204	205	28	1.103	24	0.945
18	M 6 x 1	405	n/a	406	203	204	205	28	1.103	24	0.945
19	M 6 x 1	405	n/a	407	203	204	205	THRU		THRU
20	M 6 x 1	201	202	n/a	203	204	205	22	0.866	18	0.709
21	M 6 x 1	405	n/a	406	203	204	205	28	1.103	24	0.945
22	M 6 x 1	405	n/a	406	203	204	205	28	1.103	24	0.945
23	M 6 x 1	201	202	n/a	203	204	205	22	0.866	18	0.709
24	M 6 x 1	201	202	n/a	203	204	205	22	0.866	18	0.709
25	M 6 x 1	405	n/a	406	203	204	205	28	1.103	24	0.945
26	M 6 x 1	201	202	n/a	203	204	205	22	0.866	18	0.709
27	M 6 x 1	405	n/a	406	203	204	205	28	1.103	24	0.945
28	M 6 x 1	405	n/a	406	203	204	205	28	1.103	23	0.906
29	M 6 x 1	201	202	n/a	203	204	205	22	0.866	18	0.709
30	M 6 x 1	201	202	n/a	203	204	205	23	0.906	19	0.748
31	M 6 x 1	405	n/a	406	203	204	205	28	1.103	23	0.906
32	M 6 x 1	201	202	n/a	203	204	205	22	0.866	18	0.709
33	M 6 x 1	405	n/a	406	203	204	205	28	1.103	24	0.945
34	M 6 x 1	201	202	n/a	203	204	205	22	0.866	18	0.709
35	M 6 x 1	201	202	n/a	203	204	205	22	0.866	18	0.709
36	M 6 x 1	405	n/a	406	203	204	205	28	1.103	24	0.945
37	M 6 x 1	405	n/a	406	203	204	205	28	1.103	24	0.945
38	M 6 x 1	201	202	n/a	203	204	205	22	0.866	18	0.709
39	M 6 x 1	405	n/a	406	203	204	205	28	1.103	24	0.945
40	M 6 x 1	405	n/a	406	203	204	205	28	1.103	24	0.945
41	M 6 x 1	201	202	n/a	203	204	205	22	0.866	18	0.709
42	M 6 x 1	201	202	n/a	203	204	205	23	0.906	19	0.748
43	M 6 x 1	405	n/a	406	203	204	205	28	1.103	24	0.945
44	M 6 x 1	405	n/a	406	203	204	205	28	1.103	24	0.945
45	M 6 x 1	201	202	n/a	203	204	205	22	0.866	18	0.709
46	M 6 x 1	201	202	n/a	203	204	205	23	0.906	19	0.748
47	M 6 x 1	405	n/a	406	203	204	205	28	1.103	24	0.945
48	M 6 x 1	405	n/a	406	203	204	205	28	1.103	24	0.945
49	M 6 x 1	201	202	n/a	203	204	205	22	0.866	18	0.709
50	M 6 x 1	201	202	n/a	203	204	205	23	0.906	19	0.748
51	M 6 x 1	405	n/a	406	203	204	205	28	1.103	24	0.945
52	M 6 x 1	405	n/a	406	203	204	205	28	1.103	24	0.945
53	M 6 x 1	201	202	n/a	203	204	205	22	0.866	18	0.709
54	M 6 x 1	201	202	n/a	203	204	205	23	0.906	19	0.748
55	M 6 x 1	405	n/a	406	203	204	205	28	1.103	24	0.945
56	M 6 x 1	405	n/a	406	203	204	205	28	1.103	24	0.945
57	M 6 x 1	201	202	n/a	203	204	205	22	0.866	18	0.709
58	M 6 x 1	405	n/a	406	203	204	205	28	1.103	24	0.945
59	M 6 x 1	405	n/a	406	203	204	205	28	1.103	24	0.945
60	M 6 x 1	201	202	n/a	203	204	205	22	0.866	18	0.709
61	M 6 x 1	201	202	n/a	203	204	205	23	0.906	19	0.748
62	M 6 x 1	201	202	n/a	203	204	205	22	0.866	18	0.709