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Thread Repair Specifications

Fig 1: Left Cylinder Head Camshaft Cover Face Specifications
GM1207060Courtesy of GENERAL MOTORS CORP.
Left Cylinder Head Camshaft Cover Face Specifications

Hole Location Thread Size Drill Counter Bore Tool Stop Collar Tap Driver Insert Drill Depth (Maximum) Tap Depth (Minimum)
- - J 42385- MM (IN) MM (IN)
1 6 x 1.0 201 202 N/A 203 204 205 22 0.866 18 0.709
2 6 x 1.0 608 N/A N/A 203 204 205 26 1.024 22 0.866
3 6 x 1.0 201 202 N/A 203 204 205 THRU THRU
Fig 2: Left Cylinder Head Front Face Specifications
GM1207063Courtesy of GENERAL MOTORS CORP.
Left Cylinder Head Front Face Specifications

Hole Location Thread Size Drill Counter Bore Tool Stop Collar Tap Driver Insert Drill Depth (Maximum) Tap Depth (Minimum)
- - J 42385- MM (IN) MM (IN)
1 10 x 1.5 211 212 N/A 213 214 215 32 1.260 26 1.024
2 10 x 1.5 211 212 N/A 213 214 215 28 1.102 22.5 0.886
3 8 x 1.25 610 N/A 619 208 209 620 THRU THRU
4 8 x 1.25 610 N/A 619 208 209 620 25 0.984 20 0.787
Fig 3: Left Cylinder Head Intake Face Specifications
GM1207066Courtesy of GENERAL MOTORS CORP.
Left Cylinder Head Intake Face Specifications

Hole Location Thread Size Drill Counter Bore Tool Stop Collar Tap Driver Insert Drill Depth (Maximum) Tap Depth (Minimum)
- - J 42385- MM (IN) MM (IN)
1 6 x 1.0 201 202 N/A 203 204 205 THRU THRU
2 6 x 1.0 201 202 N/A 203 204 205 25 0.984 21.25 0.837
Fig 4: Left Cylinder Head Exhaust Face Specifications
GM1207067Courtesy of GENERAL MOTORS CORP.
Left Cylinder Head Exhaust Face Specifications

Hole Location Thread Size Drill Counter Bore Tool Stop Collar Tap Driver Insert Drill Depth (Maximum) Tap Depth (Minimum)
- - J 42385- MM (IN) MM (IN)
1 10 x 1.5 211 212 N/A 213 214 215 32 1.260 26 1.024
2 16 x 1.5 861 862 N/A 863 864 860 20 0.787 16 0.630
3 8 x 1.25 206 207 N/A 208 209 210 27 1.063 22 0.866
4 8 x 1.25 206 207 N/A 208 209 210 25 0.984 20 0.787
5 6 x 1.0 201 202 N/A 203 204 205 22 0.866 18 0.708
Fig 5: Left Cylinder Head Rear Face Specifications
GM1207068Courtesy of GENERAL MOTORS CORP.
Left Cylinder Head Rear Face Specifications

Hole Location Thread Size Drill Counter Bore Tool Stop Collar Tap Driver Insert Drill Depth (Maximum) Tap Depth (Minimum)
- - J 42385- MM (IN) MM (IN)
1 16 x 1.5 861 862 N/A 863 864 860 20 0.787 16 0.630
21 16 x 1.5 861 862 N/A 863 864 860 20 0.787 16 0.630
3 8 x 1.25 206 207 N/A 208 209 210 27 1.063 22 0.866
1 Hole 2 will require that the oil passage hole be redrilled
Fig 6: Right Cylinder Head Camshaft Cover Face Specifications
GM1207070Courtesy of GENERAL MOTORS CORP.
Right Cylinder Head Camshaft Cover Face Specifications

Hole Location Thread Size Drill Counter Bore Tool Stop Collar Tap Driver Insert Drill Depth (Maximum) Tap Depth (Minimum)
- - J 42385- MM (IN) MM (IN)
1 6 x 1.0 201 202 N/A 203 204 205 THRU THRU
2 6 x 1.0 201 202 N/A 203 204 205 22 0.866 18 0.709
3 6 x 1.0 608 N/A N/A 203 204 205 26 1.024 22 0.866
Fig 7: Right Cylinder Head Front Face Specifications
GM1207071Courtesy of GENERAL MOTORS CORP.
Right Cylinder Head Front Face Specifications

Hole Location Thread Size Drill Counter Bore Tool Stop Collar Tap Driver Insert Drill Depth (Maximum) Tap Depth (Minimum)
- - J 42385- MM (IN) MM (IN)
1 10 x 1.5 211 212 N/A 213 214 215 32 1.260 26 1.024
2 6 x 1.0 201 202 N/A 203 204 205 THRU THRU
3 8 x 1.25 206 207 N/A 208 209 210 THRU THRU
4 8 x 1.25 610 N/A 619 208 209 620 25 0.984 20 0.787
Fig 8: Right Cylinder Head Intake Face Specifications
GM1207074Courtesy of GENERAL MOTORS CORP.
Right Cylinder Head Intake Face Specifications

Hole Location Thread Size Drill Counter Bore Tool Stop Collar Tap Driver Insert Drill Depth (Maximum) Tap Depth (Minimum)
- - J 42385- MM (IN) MM (IN)
1 6 x 1.0 201 202 N/A 203 204 205 THRU THRU
2 6 x 1.0 201 202 N/A 203 204 205 25 0.984 21.25 0.837
Fig 9: Right Cylinder Head Exhaust Face Specifications
GM1207078Courtesy of GENERAL MOTORS CORP.
Right Cylinder Head Exhaust Face Specifications

Hole Location Thread Size Drill Counter Bore Tool Stop Collar Tap Driver Insert Drill Depth (Maximum) Tap Depth (Minimum)
- - J 42385- MM (IN) MM (IN)
1 8 x 1.25 206 207 N/A 208 209 210 25 0.984 20 0.787
2 10 x 1.5 211 212 N/A 213 214 215 32 1.260 26 1.024
3 16 x 1.5 861 862 N/A 863 864 860 20 0.787 16 0.630
Fig 10: Right Cylinder Head Rear Face Specifications
GM1207079Courtesy of GENERAL MOTORS CORP.
Right Cylinder Head Rear Face Specifications

Hole Location Thread Size Drill Counter Bore Tool Stop Collar Tap Driver Insert Drill Depth (Maximum) Tap Depth (Minimum)
- - J 42385- MM (IN) MM (IN)
1 16 x 1.5 861 862 N/A 863 864 860 20 0.787 16 0.630
2 10 x 1.5 211 212 N/A 213 214 215 32 1.260 26 1.024
3 10 x 1.5 211 212 N/A 208 214 215 32 1.260 26 1.024
4 8 x 1.25 206 207 N/A 208 209 210 27 1.063 22 0.866
5 3/8 x 18 NPSF 2013 N/A N/A 2014 2015 2016 THRU THRU
Fig 11: Engine Block Front Specifications
GM1207081Courtesy of GENERAL MOTORS CORP.
Engine Block Front Specifications

Hole Location Thread Size Drill Counter Bore Tool Stop Collar Tap Driver Insert Drill Depth (Maximum) Tap Depth (Minimum)
- - J 42385- MM (IN) MM (IN)
1 8 x 1.25 206 207 N/A 208 209 210 27 1.063 22 0.866
2 6 x 1.0 201 202 N/A 203 204 205 19.5 0.768 15.5 0.610
3 6 x 1.0 201 202 N/A 203 204 205 24 0.945 17 0.669
4 6 x 1.0 201 202 N/A 203 204 205 THRU 17 0.669
5 10 x 1.5 211 212 N/A 213 214 215 33 1.299 27 1.063
6 8 x 1.25 206 207 N/A 208 209 210 THRU THRU
7 6 x 1.0 201 202 N/A 203 204 205 THRU THRU
8 10 x 1.5 211 212 N/A 213 214 215 THRU THRU
9 8 x 1.25 610 N/A 619 208 209 620 THRU THRU
10 6 x 1.0 201 202 N/A 203 204 205 THRU 15.5 0.610
11 8 x 1.75 2001 2002 N/A 2003 2004 2005 26 1.024 21 0.827
Fig 12: Engine Block Left Side Specifications
GM1207082Courtesy of GENERAL MOTORS CORP.
Engine Block Left Side Specifications

Hole Location Thread Size Drill Counter Bore Tool Stop Collar Tap Driver Insert Drill Depth (Maximum) Tap Depth (Minimum)
- - J 42385- MM (IN) MM (IN)
1 10 x 1.5 211 212 N/A 213 214 215 30 1.181 24 0.945
2 6 x 1.0 201 202 N/A 203 204 205 20 0.787 16 0.630
3 6 x 1.0 608 N/A N/A 203 204 205 27.5 1.083 22.5 0.886
4 6 x 1.0 201 202 N/A 203 204 205 THRU 21 0.827
5 8 x 1.25 610 N/A N/A 207 208 620 30 1.181 25 0.984
6 8 x 1.25 206 207 N/A 208 209 210 20 0.787 16 0.630
7 8 x 1.25 206 207 N/A 208 209 210 25 1.020 20 0.787
Fig 13: Engine Block Right Side Specifications
GM1207083Courtesy of GENERAL MOTORS CORP.
Engine Block Right Side Specifications

Hole Location Thread Size Drill Counter Bore Tool Stop Collar Tap Driver Insert Drill Depth (Maximum) Tap Depth (Minimum)
- - J 42385- MM (IN) MM (IN)
1 10 x 1.5 211 212 N/A 213 214 215 30 1.181 24 0.945
2 6 x 1.0 608 N/A N/A 203 204 205 27.5 1.083 22.5 0.886
3 10 x 1.5 211 212 N/A 213 214 215 33 1.299 27 1.063
Fig 14: Engine Block Rear Specifications
GM1207084Courtesy of GENERAL MOTORS CORP.
Engine Block Rear Specifications

Hole Location Thread Size Drill Counter Bore Tool Stop Collar Tap Driver Insert Drill Depth (Maximum) Tap Depth (Minimum)
- - J 42385- MM (IN) MM (IN)
1 12 x 1.75 856 857 N/A 858 859 855 THRU THRU
2 8 x 1.25 206 207 N/A 208 209 210 THRU THRU
3 No Service-Not Threaded
4 8 x 1.25 206 207 N/A 208 209 210 30 1.181 24 0.945
5 8 x 1.25 206 207 N/A 208 209 210 THRU 24 0.945
Fig 15: Engine Block Top Specifications
GM1207085Courtesy of GENERAL MOTORS CORP.
Engine Block Top Specifications

Hole Location Thread Size Drill Counter Bore Tool Stop Collar Tap Driver Insert Drill Depth (Maximum) Tap Depth (Minimum)
- - J 42385- MM (IN) MM (IN)
1 8 x 1.25 206 207 N/A 208 209 210 23.5 0.925 18.5 0.728
2 10 x 1.5 211 212 N/A 213 214 215 31.5 1.240 26.5 1.082
Fig 16: Engine Block Left Deck Face Specifications
GM1207087Courtesy of GENERAL MOTORS CORP.
Engine Block Left Deck Face Specifications

Hole Location Thread Size Drill Counter Bore Tool Stop Collar Tap Driver Insert Drill Depth (Maximum) Tap Depth (Minimum)
- - J 42385- MM (IN) MM (IN)
1 11 x 2.0 2031 N/A 2017 2032 2033 108 73 2.874 67 2.638
2 11 x 2.0 2031 N/A N/A 2032 2033 108 89.5 3.524 83.5 3.287
3 6 x 1.0 608 N/A N/A 203 204 205 30 1.181 25 0.984
Fig 17: Engine Block Right Deck Face Specifications
GM1207089Courtesy of GENERAL MOTORS CORP.
Engine Block Right Deck Face Specifications

Hole Location Thread Size Drill Counter Bore Tool Stop Collar Tap Driver Insert Drill Depth (Maximum) Tap Depth (Minimum)
- - J 42385- MM (IN) MM (IN)
1 11 x 2.0 2031 N/A 2017 2032 2033 108 73 2.874 67 2.638
2 10 x 1.5 211 212 N/A 213 214 215 31.5 1.240 26.5 1.082
3 6 x 1.0 608 N/A N/A 203 204 205 30 1.181 25 0.894
4 11 x 2.0 2031 N/A N/A 2032 2033 108 89.5 3.524 83.5 3.287
Fig 18: Engine Block Lower Face Specifications
GM1207090Courtesy of GENERAL MOTORS CORP.
Engine Block Lower Face Specifications

Hole Location Thread Size Drill Counter Bore Tool Stop Collar Tap Driver Insert Drill Depth (Maximum) Tap Depth (Minimum)
- - J 42385- MM (IN) MM (IN)
1 10 x 1.5 511 N/A N/A 512 513 514 32 1.260 26.5 1.043
2 8 x 1.25 610 N/A N/A 208 209 620 THRU THRU
3 8 x 1.25 610 N/A N/A 208 209 620 37 1.457 32 1.260
IMPORTANT: Items required for Main Bearing repair (3) 510 bolts (1) 306 Plate SPX (1) 307 bushing (1) 308 alignment pin
Fig 19: Lower Crankcase Pan Face Specifications
GM1207091Courtesy of GENERAL MOTORS CORP.
Lower Crankcase Pan Face Specifications

Hole Location Thread Size Drill Counter Bore Tool Stop Collar Tap Driver Insert Drill Depth (Maximum) Tap Depth (Minimum)
- - J 42385- MM (IN) MM (IN)
1 6 x 1.0 201 202 N/A 203 204 205 THRU THRU
2 6 x 1.0 201 202 N/A 203 204 205 22 0.866 18 0.709
3 6 x 1.0 201 202 N/A 203 204 205 19 0.748 15 0.591
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