Engine Block - Rear View

Fig 1: Engine Block - 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)
J 42385-400 . See Special Tools .								mm	(in)	mm	(in)
1	M 16 x 1.5	n/a	n/a	n/a	n/a	n/a	n/a	39	1.536	33	1.300
2	M 10 x 1.5	211	212	n/a	213	214	420	39	1.536	33	1.300
3	M 6 x 1	201	202	n/a	203	204	205	20	0.788	16	0.630
4	M 8 x 1	206	207	n/a	208	209	210	39	1.536	33	1.300
5	M 6 x 1	211	212	n/a	213	214	215	39	1.536	33	1.300
6	M 10 x 1.5	211	212	n/a	213	214	215	57	2.245	54	2.127