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Engine Block - Back View

Fig 1: Engine Block Thread Specifications - Back View
GM524534Courtesy of GENERAL MOTORS CORP.
Engine Block - Back View

Service Call Out Thread Size Insert Drill Counterbore Tool Tap Driver Drill Depth (Maximum) Tap Depth (Maximum)
J 42385- MM (IN) MM (IN)
1 M12 x 1.75 855 856 857 858 859 39 1.535 33.5 1.32
2 M16 x 1.5 860 861 862 863 864 21 0.827 15 0.59
3 M10 x 1.5 215 211 212 213 214 29 1.161 THRU
4 M8 x 1.25 210 206 207 208 209 18 0.709 THRU
5 M8 x 1.25 854
No Flange		 206 207 208 209 18 0.709 THRU
6 M16 x 1.5 860 861 862 863 864 21 0.827 15 0.59
7 M12 x 1.75 855 856 857 858 859 39 1.535 33.5 1.32
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