Engine Block - Left Side View

Fig 1: Engine Block - Left 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	0.768	12.5	0.49	515
2	M6 x 1.0	205	201	202	203	204	-	-	-	-	-
3	M12 x 1.75	865	856	857	858	859	19.50	0.768	12.5	0.49	514
4	M10 x 1.5	215	211	212	213	214	23.50	0.925	18.5	0.73	521
5	M10 x 1.5	215	211	212	213	214	23.50	0.925	18.5	0.73	519
6	M6 x 1.0	205	201	202	203	204	20.50	0.807	16.0	0.63	513
7	M6 x 1.0	205	201	202	203	204	20.50	0.807	16.0	0.63	512
8	M6 x 1.0	205	201	202	203	204	20.50	0.807	16.0	0.63	511
9	M6 x 1.0	205	201	202	203	204	-	-	-	-	-
10	M12 x 1.75	865	856	857	858	859	19.50	0.768	12.5	0.49	516