Engine Block - Right Side View

Fig 1: Engine Block - Right Side View

Courtesy of GENERAL MOTORS CORP.

Service Call Out	Thread Size	Insert	Drill	Counterbore Tool	Tap	Driver	Drill Depth (Maximum)		Tap Depth (Maximum)		Engineering Hole Number
J 42385-							MM	(IN)	MM	(IN)	-
1	M12 x 1.75	865	856	857	858	859	19.50	0.778	12.5	0.49	613
2	M12 x 1.75	865	856	857	858	859	19.50	0.778	12.5	0.49	612
3	M6 x 1.0	205	201	202	203	204	20.50	0.807	16.5	.065	610
4	M12 x 1.75	865	856	857	858	859	15.50	0.610	12.5	0.49	606
5	M8 x 1.25	210	206	207	208	209	23.50	0.925	18.0	0.71	609
6	M8 x 1.25	210	206	207	208	209	23.50	0.925	18.0	0.71	608
7	M8 x 1.25	210	206	207	208	209	23.50	0.925	18.0	0.71	607
8	M12 x 1.75	855	856	857	858	859	33.50	1.319	26.5	1.04	617
9	M8 x 1.25	210	206	207	208	209	30.50	1.201	22.5	0.89	604
10	M8 x 1.25	210	206	207	208	209	30.50	1.201	22.5	0.89	605
11	M8 x 1.25	210	206	207	208	209	30.50	1.201	22.5	0.89	603
12	M8 x 1.25	210	206	207	208	209	30.50	1.201	22.5	0.89	601
13	M8 x 1.25	210	206	207	208	209	30.50	1.201	22.5	0.89	602
14	M12 x 1.75	855	856	857	858	859	33.50	1.319	26.5	1.04	616
15	M12 x 1.75	865	856	857	858	859	19.50	0.778	12.5	0.49	614