Engine Block - Bottom View

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Engine Block - Bottom 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)
-								mm	(in)	mm	(in)
1	8 x 1.25	206	207	n/a	208	209	210	30	1.182	25	0.985
2	10 x 1.5	417	n/a	n/a	418	419	420	53	2.088	45	1.773
3	8 x 1.25	206	207	n/a	208	209	210	30	1.182	25	0.985
4	10 x 1.5	417	n/a	n/a	418	419	420	53	2.088	45	1.773
5	8 x 1.25	206	207	n/a	208	209	210	30	1.182	25	0.985
6	8 x 1.25	206	207	n/a	208	209	210	30	1.182	25	0.985
7	10 x 1.5	417	n/a	n/a	418	419	420	53	2.088	45	1.773
8	8 x 1.25	206	207	n/a	208	209	210	30	1.182	25	0.985
9	10 x 1.5	417	n/a	n/a	418	419	420	53	2.088	45	1.773
10	8 x 1.25	206	207	n/a	208	209	210	30	1.182	25	0.985
11	8 x 1.25	206	207	n/a	208	209	210	30	1.182	25	0.985
12	10 x 1.5	417	n/a	n/a	418	419	420	53	2.088	45	1.773
13	8 x 1.25	206	207	n/a	208	209	210	30	1.182	25	0.985
14	10 x 1.5	417	n/a	n/a	418	419	420	53	2.088	45	1.773
15	8 x 1.25	206	207	n/a	208	209	210	30	1.182	25	0.985
16	8 x 1.25	206	207	n/a	208	209	210	30	1.182	25	0.985
17	10 x 1.5	417	n/a	n/a	418	419	420	53	2.088	45	1.773
18	10 x 1.5	417	n/a	n/a	418	419	420	53	2.088	45	1.773
19	8 x 1.25	206	207	n/a	208	209	210	30	1.182	25	0.985
20	8 x 1.25	206	207	n/a	208	209	210	30	1.182	25	0.985
21	10 x 1.5	417	n/a	n/a	418	419	420	53	2.088	45	1.773
22	8 x 1.25	206	207	n/a	208	209	210	30	1.182	25	0.985
23	10 x 1.5	417	n/a	n/a	418	419	420	53	2.088	45	1.773
24	8 x 1.25	206	207	n/a	208	209	210	30	1.182	25	0.985
25	10 x 1.5	417	n/a	n/a	418	419	420	53	2.088	45	1.773
26	8 x 1.25	206	207	n/a	208	209	210	30	1.182	25	0.985
27	8 x 1.25	206	207	n/a	208	209	210	30	1.182	25	0.985
28	10 x 1.5	417	n/a	n/a	418	419	420	53	2.088	45	1.773
29	8 x 1.25	206	207	n/a	208	209	210	30	1.182	25	0.985
30	8 x 1.25	206	207	n/a	208	209	210	30	1.182	25	0.985
31	10 x 1.5	417	n/a	n/a	418	419	420	53	2.088	45	1.773
32	8 x 1.25	206	207	n/a	208	209	210	30	1.182	25	0.985
33	20 x 16	n/a	n/a	n/a	n/a	n/a	n/a	33	1.300	23	0.906
34	8 x 1.25	n/a	n/a	n/a	n/a	n/a	n/a	30	1.182	25	0.985
35	8 x 1.25	206	207	n/a	208	209	210	30	1.182	25	0.985
36	10 x 1.5	417	n/a	n/a	418	419	420	53	2.088	45	1.773