Cylinder Head - Exhaust Manifold Deck View

WARNING: This page is about a different car, the 2004 Pontiac Sunfire and 2004 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Cylinder Head Thread Specification - Exhaust Manifold Deck View

Courtesy of GENERAL MOTORS CORP.

Service Call Out	Thread Size	Insert	Drill	Counterbore Tool	Tap	Driver	Drill Depth (Maximum)		Tap Depth (Maximum)
J 42385-							MM	(IN)	MM	(IN)
1	M8 x 1.25	210	206	207	208	209	25	0.984	20	0.78
2	M8 x 1.25	210	206	207	208	209	25	0.984	20	0.78
3	M8 x 1.25	210	206	207	208	209	25	0.984	20	0.78
4	M27 x 2.0	N/A	N/A	N/A	N/A	N/A	THRU		12	0.78
5	M8 x 1.25	210	206	207	208	209	25	0.984	20	0.78
6	M8 x 1.25	210	206	207	208	209	25	0.984	20	0.78
7	M8 x 1.25	210	206	207	208	209	25	0.984	20	0.78
8	M8 x 1.25	210	206	207	208	209	25	0.984	20	0.78
9	M8 x 1.25	210	206	207	208	209	25	0.984	20	0.78
10	M8 x 1.25	210	206	207	208	209	25	0.984	20	0.78
11	M6 x 1.0	205	201	202	203	204	20	0.78	16	0.630
12	M8 x 1.25	210	206	207	208	209	25	0.984	20	0.78
13	M8 x 1.25	210	206	207	208	209	25	0.984	20	0.78
14	M8 x 1.25	210	206	207	208	209	25	0.984	20	0.78