Engine Block - Rear View

Fig 1: Engine Block Thread Repair - 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								mm	(in)	mm	(in)
1	16 x 1.5	n/a	n/a	n/a	n/a	n/a	n/a	24	0.945	16	0.630
2	10 x 1.5	211	212	n/a	213	214	420	39	1.536	33	1.300
3	6 x 1	201	202	n/a	203	204	205	20	0.788	16	0.630
4	10 x 1.5	211	212	n/a	213	214	215	57	2.245	54	2.127