Engine Block - Top View

Fig 1: Engine Block - Top 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	M11 x 1.5	507	504	N/A	505	506	113.30	4.461	107.3	4.22	308
2	M12 x 1.75	865	856	857	858	859	13.50	0.531	12.5	0.49	317
3	M11 x 1.5	507	504	N/A	505	506	113.30	4.461	107.3	4.22	309
4	M11 x 1.5	507	504	N/A	505	506	113.30	4.461	107.3	4.22	310
5	M11 x 1.5	507	504	N/A	505	506	113.30	4.461	107.3	4.22	302
6	M11 x 1.5	507	504	N/A	505	506	113.30	4.461	107.3	4.22	305
7	M11 x 1.5	507	504	N/A	505	506	113.30	4.461	107.3	4.22	304
8	M11 x 1.5	507	504	N/A	505	506	113.30	4.461	107.3	4.22	303
9	M11 x 1.5	507	504	N/A	505	506	113.30	4.461	107.3	4.22	301
10	M8 x 1.25	210	206	207	208	209	23.50	0.925	18.5	0.73	313
11	M8 x 1.25	210	206	207	208	209	23.50	0.925	18.5	0.73	311
12	M8 x 1.25	210	206	207	208	209	23.50	0.925	18.5	0.73	312
13	M11 x 1.5	507	504	N/A	505	506	113.30	4.461	107.3	4.22	306
14	M8 x 1.25	210	206	207	208	209	23.50	0.925	18.5	0.73	314
15	M11 x 1.5	507	504	N/A	505	506	113.30	4.461	107.3	4.22	307
16	M12 x 1.75	865	856	857	858	859	13.50	0.531	12.5	0.49	316