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HOMESERVICE MANUALSPONTIAC2008GRAND PRIX BASEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 62 (ENGINE MECHANICAL)SPECIFICATIONSTHREAD REPAIR SPECIFICATIONSENGINE BLOCK - BOTTOM VIEW
2008 Pontiac Grand Prix Base

Engine Block - Bottom View

2008 Pontiac Grand Prix BaseSECTION Engine Block - Bottom View
WARNING: This page is about a different car, the 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Engine Block Bolt Holes - Bottom View
GM64655Courtesy of GENERAL MOTORS CORP.
Engine Block - Bottom View

Hole Thread Size Insert Drill Counterbore Tool Tap Driver Drill Depth - Maximum mm (in) Tap Depth - Maximum mm (in)
1 M10 x 2.0 J 42385-104 J 42385-101 - J 42385-102 J 42385-103 31.0 (1.22) 25.5 (1.0)
2 M10 x 2.0 J 42385-104 J 42385-101 - J 42385-102 J 42385-103 53.5 (2.10) 44.0 (1.73)
3 M8 x 1.25 J 42385-210 J 42385-206 J 42385-207 J 42385-208 J 42385-209 22.5 (0.885) 17.5 (0.688)
4 M10 x 2.0 J 42385-104 J 42385-101 - J 42385-102 J 42385-103 31.0 (1.22) 25.5 (1.0)
5 M10 x 2.0 J 42385-104 J 42385-101 - J 42385-102 J 42385-103 53.5 (2.10) 44.0 (1.73)
6 M16 x 1.5 - - - - - - -
7 N/A - - - - - - -
8 M8 x 1.25 J 42385-210 J 42385-206 J 42385-207 J 42385-208 J 42385-209 22.5 (0.885) 17.5 (0.688)
9 M10 x 2.0 J 42385-104 J 42385-101 - J 42385-102 J 42385-103 31.0 (1.22) 25.5 (1.0)
10-11 M10 x 2.0 J 42385-104 J 42385-101 - J 42385-102 J 42385-103 53.5 (2.10) 44.0 (1.73)
12 M10 x 2.0 J 42385-104 J 42385-101 - J 42385-102 J 42385-103 31.0 (1.22) 25.5 (1.0)
13-14 M10 x 1.5 J 42385-215 J 42385-101 - J 42385-213 J 42385-214 42.5 (1.67) 37.0 (1.45)
15 M8 x 1.25 J 42385-210 J 42385-206 J 42385-207 J 42385-208 J 42385-209 22.5 (0.885) 17.5 (0.688)
16 M16 x 1.5 - - - - - - -
17 M10 x 2.0 J 42385-104 J 42385-101 - J 42385-102 J 42385-103 53.5 (2.10) 44.0 (1.73)
18 M10 x 2.0 J 42385-104 J 42385-101 - J 42385-102 J 42385-103 31.0 (1.22) 25.5 (1.0)
19 M8 x 1.25 J 42385-210 J 42385-206 J 42385-207 J 42385-208 J 42385-209 22.5 (0.885) 17.5 (0.688)
20 M10 x 2.0 J 42385-104 J 42385-101 - J 42385-102 J 42385-103 53.5 (2.10) 44.0 (1.73)
21 M10 x 2.0 J 42385-104 J 42385-101 - J 42385-102 J 42385-103 31.0 (1.22) 25.5 (1.0)
22 M8 x 1.25 J 42385-210 J 42385-206 J 42385-207 J 42385-208 J 42385-209 22.5 (0.885) 17.5 (0.688)
23 M10 x 2.0 J 42385-104 J 42385-101 - J 42385-102 J 42385-103 31.0 (1.22) 25.5 (1.0)
24 M10 x 2.0 J 42385-104 J 42385-101 - J 42385-102 J 42385-103 53.5 (2.10) 44.0 (1.73)
25-26 M8 x 1.25 J 42385-210 J 42385-206 J 42385-207 J 42385-208 J 42385-209 22.5 (0.885) 17.5 (0.688)
27 M10 x 2.0 J 42385-104 J 42385-101 - J 42385-102 J 42385-103 31.0 (1.22) 25.5 (1.0)
28-29 M10 x 2.0 J 42385-104 J 42385-101 - J 42385-102 J 42385-103 53.5 (2.10) 44.0 (1.73)
30 M10 x 2.0 J 42385-104 J 42385-101 - J 42385-102 J 42385-103 31.0 (1.22) 25.5 (1.0)
31 M8 x 1.25 J 42385-210 J 42385-206 J 42385-207 J 42385-208 J 42385-209 22.5 (0.885) 17.5 (0.688)
32 M28 x 1.25 - - - - - - -
33 M8 x 1.25 J 42385-210 J 42385-206 J 42385-207 J 42385-208 J 42385-209 22.5 (0.885) 17.5 (0.688)
34 M10 x 2.0 J 42385-104 J 42385-101 - J 42385-102 J 42385-103 53.5 (2.10) 44.0 (1.73)
35 M10 x 2.0 J 42385-104 J 42385-101 - J 42385-102 J 42385-103 31.0 (1.22) 25.5 (1.0)
36 M8 x 1.25 J 42385-210 J 42385-206 J 42385-207 J 42385-208 J 42385-209 22.5 (0.885) 17.5 (0.688)
  • Bolt holes 2, 5, 10, 11, 18, 21, 24, 28, 29, and 34 have a 20.5 mm (0.807 in) counterbore included in the 53.5 mm (2.10 in) drill depth.
  • Bolt holes 1, 4, 9, 12, 17, 20, 23, 27, 30, and 35 have a 1.5 mm (0.059 in) counterbore included in the 31.0 mm (1.22 in) drill depth. Use sleeve J 42385-316 with the drill and tap.
  • Bolt holes 13 and 14 have a 11.5 mm (0.452 in) counterbore included in the 42.5 mm (1.67 in) drill depth. Use sleeve J 42385-311 with the drill and tap.
RENDER: 1.0x

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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.