Engine Block - Left Side View

Fig 1: Engine Block Bolt Holes - Left Side View

Courtesy of GENERAL MOTORS CORP.

Hole	Thread Size	Insert	Drill	Counterbore Tool	Tap	Driver	Drill Depth - Maximum mm (in)	Tap Depth - Maximum mm (in)
J 42385
1	M28 x 1.25	N/A	N/A	N/A	N/A	N/A	N/A	N/A
2	M8 x 1.25	210	206	207	208	209	28.5 (1.122)	23.0 (0.905)
3	M8 x 1.25	210	206	207	208	209	21.5 (0.846)	16.0 (0.629)
4	M10 x 1.25	215	211	212	213	214	29.0 (1.141)	23.0 (0.905)
5	M10 x 1.5	215	211	212	213	214	27.0 (1.062)	21.5 (0.846)
6	M16 x 1.5	N/A	N/A	N/A	N/A	N/A	N/A	N/A
7	M11 x 2.0 First Design	108	105	N/A	106	107	124.0 (4.88)	115.0 (4.52)
7	M11 x 2.0 Second Design	108	105	N/A	106	107	69.0 (2.72)	60.0 (2.36)
8	M11 x 2.0	108	105	N/A	106	107	69.0 (2.72)	60.0 (2.36)
Bolt holes 7, second design, and 8 have a 30 mm (1.18 in) counterbore included in the 69.0 mm (2.72 in) drill depth. Use sleeve J 42385-315 with the drill and tap. Bolt holes 7, first design, have a 85 mm (3.34 in) counterbore included in the 124.0 mm (4.88 in) drill depth.