Engine Block - Left Side View

Fig 1: Engine Block - 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)
J 42385-400 . See Special Tools .								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 6 x 1	201	202	n/a	203	204	205	22	0.866	18	0.709
3	M 12 x 1.75	856	857	n/a	858	859	416	33	1.3	17	0.669
4	M 8x 1.25	206	207	n/a	208	209	210	25	0.985	20	0.788
5	M 28x 1.25	n/a	n/a	n/a	n/a	n/a	n/a	25	0.985	17	0.669
6	M 24 x 1.5	n/a	n/a	n/a	n/a	n/a	n/a	30	1.182	20	0.788
7	M 6 x 1	201	202	n/a	203	204	205	19	0.748	15	0.591
8	M 6 x 1	206	207	n/a	208	209	210	19	0.748	15	0.591