Engine Block - Left Side View

Fig 1: Engine Block Thread Repair - Left Side 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 10 x 1.5	211	212	n/a	213	214	420	33	1.3	27	1.063
2	M 10 x 1.5	211	212	n/a	213	214	420	33	1.3	27	1.063
3	M 6 x 1	201	202	n/a	203	204	205	22	0.866	18	0.709
4	M 12 x 1.75	856	857	n/a	858	859	416	33	1.3	17	0.669
5	M 24 x 1.5	n/a	n/a	n/a	n/a	n/a	n/a	30	1.182	20	0.788
6	M 10 x 1.5	211	212	n/a	213	214	420	33	1.3	27	1.063
7	M 28 x 1.25	n/a	n/a	n/a	n/a	n/a	n/a	25	0.985	17	0.669
8	M 10 x 1.5	211	212	n/a	213	214	420	33	1.3	27	1.063
9	M 10 x 1.5	211	212	n/a	213	214	420	33	1.3	27	1.063
10	M 8 x 1.25	206	207	n/a	208	209	210	25	0.985	20	0.788
11	M 6 x 1	201	202	n/a	203	204	205	25	0.985	20	0.788
12	M 8 x 1.25	206	207	n/a	208	209	210	25	0.985	20	0.788
13	M 8 x 1.25	206	207	n/a	208	209	210	25	0.985	20	0.788
14	M 6 x 1	201	202	n/a	203	204	205	19	0.748	15	0.591
15	M 8 x 1.25	206	207	n/a	208	209	210	25	0.985	20	0.788
16	M 10 x 1.5	211	212	n/a	213	214	420	25	0.985	20	0.788
17	M 8 x 1.25	206	207	n/a	208	209	210	19	0.748	15	0.591
18	M 10 x 1.5	211	212	n/a	213	214	420	33	1.3	27	1.063
19	M 8 x 1.25	206	207	n/a	208	209	210	33	1.3	27	1.063
20	M 6 x 1	201	202	n/a	203	204	205	22	0.866	18	0.709
21	M 10 x 1.5	211	212	n/a	213	214	420	33	1.3	27	1.063
22	M 10 x 1.5	211	212	n/a	213	214	420	33	1.3	27	1.063
23	M 10 x 1.5	211	212	n/a	213	214	420	33	1.3	27	1.063
24	M 10 x 1.5	211	212	n/a	213	214	420	33	1.3	27	1.063