Cylinder Head - End - Front View

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Fig 1: Cylinder Head - End - Front 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 6 x 1	201	202	n/a	203	204	205	28	1.103	22	0.866
2	M 10 x 1.5	211	212	n/a	213	214	215	28	1.103	22	0.866
3	M 24 x 1.5	n/a	n/a	n/a	n/a	n/a	n/a	THRU		THRU
4	M 8 x 1.25	206	207	n/a	208	209	210	28	1.103	23	0.906