Cylinder Head - Intake Port 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 Intake Port

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 8 x 1.25	206	207	N/A	208	209	210	21	0.83	17	0.669
2	M 8 x 1.25	206	207	N/A	208	209	210	21	0.83	17	0.669
3	M 8 x 1.25	206	207	N/A	208	209	210	21	0.83	17	0.669
4	M 8 x 1.25	206	207	N/A	208	209	210	21	0.83	17	0.669
5	M 8 x 1.25	206	207	N/A	208	209	210	21	0.83	17	0.669
6	M 8 x 1.25	206	207	N/A	208	209	210	21	0.83	17	0.669
7	M 8 x 1.25	206	207	N/A	208	209	210	21	0.83	17	0.669
8	M 8 x 1.25	206	207	N/A	208	209	210	21	0.83	17	0.669
9	M 8 x 1.25	206	207	N/A	208	209	210	21	0.83	17	0.669
10	M 8 x 1.25	206	207	N/A	208	209	210	21	0.83	17	0.669
11	M 8 x 1.25	206	207	N/A	208	209	210	21	0.83	17	0.669
12	M 8 x 1.25	206	207	N/A	208	209	210	21	0.83	17	0.669
13	M 8 x 1.25	206	207	N/A	208	209	210	21	0.83	17	0.669
14	M 8 x 1.25	206	207	N/A	208	209	210	21	0.83	17	0.669