FixVault

Cylinder Head - Top View

Fig 1: Identifying Bolt Size & Locations On Cylinder Head - Top
GM1825024Courtesy of GENERAL MOTORS CORP.
Cylinder Head - Top View

Service Call Out Thread Size Insert Drill Counterbore Tool Tap Driver Drill Depth
Maximum
Tap Depth
Maximum
J 42385-850 MM IN MM IN
1 M6 x 1 205 852 N/A 203 204 23 0.906 19 0.748
2 M6 x 1 205 201 202 203 204 20 0.787 16 0.63
3 M14 x 1.75 856 857 N/A 858 859 THRU THRU
4 M8 x 1.25 854 853 N/A 208 209 30 1.182 27 1.063