Engine Block - Right Side View

Fig 1: Engine Block Thread Repair - Right Side 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	32	1.260	23	0.906
2	16 x 1.5	211	212	n/a	213	214	420	32	1.260	23	0.906
3	16 x 1.5	206	207	n/a	208	209	210	32	1.260	23	0.906
4	10 x 1.5	n/a	n/a	n/a	n/a	n/a	n/a	33	1.300	27	1.063
5	10 x 1.5	211	212	n/a	213	214	420	33	1.300	27	1.063
6	16 x 2	211	212	n/a	213	214	420	24	0.945	16	0.630
7	10 x 1.5	n/a	n/a	n/a	n/a	n/a	n/a	29	1.142	26	1.024
8	8 x 1.25	211	212	n/a	213	214	420	23	0.906	18	0.709