Engine Block - Top View

Fig 1: Engine Block Thread Repair - 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 11 x 2	402	n/a	n/a	403	404	108	59	2.324	51	2.009
2	M 11 x 2	402	n/a	n/a	403	404	108	59	2.324	51	2.009
3	M 11 x 2	402	n/a	n/a	403	404	108	59	2.324	51	2.009
4	M 11 x 2	402	n/a	n/a	403	404	108	59	2.324	51	2.009
5	M 11 x 2	402	n/a	n/a	403	404	108	59	2.324	51	2.009
6	M 11 x 2	402	n/a	n/a	403	404	108	59	2.324	51	2.009
7	M 6 x 1	201	202	n/a	203	204	205	22	0.866	18	0.709
8	M 6 x 1	201	202	n/a	203	204	205	30	1.182	26	1.024
9	M 6 x 1	201	202	n/a	203	204	205	22	0.866	18	0.709
10	M 11 x 2	402	n/a	n/a	403	404	108	59	2.324	51	2.009
11	M 11 x 2	402	n/a	n/a	403	404	108	59	2.324	51	2.009
12	M 11 x 2	402	n/a	n/a	403	404	108	59	2.324	51	2.009
13	M 11 x 2	402	n/a	n/a	403	404	108	59	2.324	51	2.009
14	M 11 x 2	402	n/a	n/a	403	404	108	59	2.324	51	2.009
15	M 11 x 2	402	n/a	n/a	403	404	108	59	2.324	51	2.009
16	M 11 x 2	402	n/a	n/a	403	404	108	59	2.324	51	2.009
17	M 11 x 2	402	n/a	n/a	403	404	108	59	2.324	51	2.009