Cylinder Head - Top View

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: View Of Cylinder Head - Top

Courtesy of GENERAL MOTORS CORP.

Service Hole Location	Thread Size	Drill	Counterbore Tool	Stop Collar	Tap	Driver	Insert	Drill Depth (Max)		Tap Depth (Min)
mm	(in)	mm	(in)	-	-	-	-	-	-	-	-
1	M 10 x 1.5	211	212	N/A	213	214	215	26	1.02	21	0.827
2	M 6 x 1.0	201	202	N/A	203	204	205	17	0.67	13	0.512
3	M 10 x 1.5	not serviced						26	1.02	21	0.827
4	M 6 x 1.0	201	202	N/A	203	204	205	17	0.67	13	0.512
5	M 10 x 1.5	211	212	N/A	213	214	215	26	1.02	21	0.827
6	M 6 x 1.0	201	202	N/A	203	204	205	17	0.67	13	0.512
7	M 10 x 1.5	not serviced						26	1.02	21	0.827
8	M 6 x 1.0	201	202	N/A	203	204	205	17	0.67	13	0.512
9	M 10 x 1.5	211	212	N/A	213	214	215	26	1.02	21	0.827
10	M 6 x 1.0	201	202	N/A	203	204	205	17	0.67	13	0.512
11	M 8 x 1.25	206	207	N/A	208	209	210	21	0.83	17	0.669
12	M 6 x 1.0	201	202	N/A	203	204	205	17	0.67	13	0.512
13	M 6 x 1.0	201	202	N/A	203	204	205	17	0.67	13	0.512
14	M 10 x 1.5	211	212	N/A	213	214	215	26	1.02	21	0.827
15	M 6 x 1.0	201	202	N/A	203	204	205	17	0.67	13	0.512
16	M 10 x 1.5	211	212	N/A	213	214	215	26	1.02	21	0.827
17	M 6 x 1.0	201	202	N/A	203	204	205	17	0.67	13	0.512
18	M 10 x 1.5	211	212	N/A	213	214	215	26	1.02	21	0.827
19	M 6 x 1.0	201	202	N/A	203	204	205	17	0.67	13	0.512
20	M 10 x 1.5	211	212	N/A	213	214	215	26	1.02	21	0.827
21	M 6 x 1.0	201	202	N/A	203	204	205	17	0.67	13	0.512
22	M 6 x 1.0	201	202	N/A	203	204	205	17	0.67	13	0.512