Engine Block - Rear View

Fig 1: Engine Block Thread Repair - Rear 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	10 x 1.5	211	212	n/a	213	214	216	39	1.536	33	1.300
2	10 x 1.5	211	212	n/a	213	214	420	39	1.536	33	1.300
3	6 x 1	201	202	n/a	203	204	205	20	0.788	16	0.630
4	6 x 1	201	202	n/a	203	204	205	20	0.788	16	0.630
5	10 x 1.5	211	212	n/a	213	214	420	39	1.536	33	1.300
6	16 x 1.5	n/a	n/a	n/a	n/a	n/a	n/a	24	0.945	16	0.630
7	10 x 1.5	211	212	n/a	213	214	420	39	1.536	33	1.300
8	10 x 1.5	211	212	n/a	213	214	215	57	2.245	54	2.127
9	10 x 1.5	211	212	n/a	213	214	420	39	1.536	33	1.300
10	6 x 1	201	202	n/a	203	204	205	20	0.788	16	0.630
11	6 x 1	201	202	n/a	203	204	205	20	0.788	16	0.630
12	6 x 1	201	202	n/a	203	204	205	20	0.788	16	0.630
13	6 x 1	201	202	n/a	203	204	205	20	0.788	16	0.630
14	6 x 1	201	202	n/a	203	204	205	20	0.788	16	0.630
15	6 x 1	201	202	n/a	203	204	205	20	0.788	16	0.630
16	10 x 1.5	211	212	n/a	213	214	215	39	1.536	33	1.300
17	10 x 1.5	211	212	n/a	213	214	215	57	2.245	54	2.127
18	10 x 1.5	211	212	n/a	213	214	420	39	1.536	33	1.300