Bolt Torque Spec Chart for Chevy / GM

Small Block Chevy

Big Block Chevy

Fastener Type

Torque Spec

 

 

Fastener Type 

Torque Specs

7/16 in. outer main cap bolt

65 ft.-lbs.

 

 

Main cap bolt, 396-427 2-bolt

95 ft.-lbs.

7/16 in. inner main cap bolt

70 ft.-lbs.

 

 

Main cap bolt, 396-454 4-bolt (inner/outer)

110 ft.-lbs.

3/8 in. outer main cap bolt

40 ft.-lbs.

 

 

3/8 in. connecting rod bolt 

50 ft.-lbs.

11/32 in. connecting rod bolt

38-44 ft.-lbs.

 

 

7/16 in. connecting rod bolt

67-73 ft.-lbs.

3/8 in. connecting rod bolt 

40-45 ft.-lbs.

 

 

Cylinder head bolts, long

75 ft.-lbs.

Cylinder head bolts

65 ft.-lbs.

 

 

Cylinder head bolts, short

65-68 ft.-lbs.

Screw-in rocker arm studs

50 ft.-lbs.

 

 

Screw-in rocker arm studs

50 ft.-lbs.

Intake manifold bolts (cast iron heads)

30 ft.-lbs.

 

 

Intake manifold bolts (cast iron head) 

25 ft.-lbs.

Oil pump bolt

60-70 ft.-lbs.

 

 

Oil pump bolt

65 ft.-lbs.

Cam sprocket bolts

18-20 ft.-lbs.

 

 

Cam sprocket bolts 

20 ft.-lbs.

Harmonic damper bolt

60 ft.-lbs.

 

 

Harmonic damper bolt 

85 ft.-lbs.

Flywheel/flexplate bolts

65 ft.-lbs.

 

 

Flywheel/flexplate bolts

60 ft.-lbs.

Pressure plate bolts

35 ft.-lbs.

 

 

Pressure plate bolts 

35 ft.-lbs.

Bellhousing bolts

25 ft.-lbs.

 

 

Bellhousing bolts

25 ft.-lbs.

Exhaust manifold bolts

25 ft.-lbs.

 

 

Exhaust manifold bolts

 20 ft.-lbs.

 

Bolt Torque Spec Chart for Ford

260, 289, 302 

351W 

Fastener Type

Torque Spec

 

Fastener Type

Torque Specs

Main cap bolts

60-70 ft.-lbs.

 

Main cap bolts

95-105 ft.-lbs.

Outer main cap bolts

35-40 ft.-lbs.

 

Connecting rod bolts

40-45 ft.-lbs.

Connecting rod bolts

19-24 ft.-lbs. (40-45 ft.-lbs. for 289 HP Boss 302)

 

Cylinder head bolts

90-100 ft.-lbs.

Cylinder head bolts

65-72 ft.-lbs.

 

Rocker arms

17-23 ft.-lbs.

Rocker arms

17-23 ft.-lbs.

 

Intake manifold bolts

23-25 ft.-lbs.

Intake manifold bolts

23-25 ft.-lbs.

 

Oil pump bolt 

23-28 ft.-lbs.

Oil pump bolt

23-28 ft.-lbs.

 

Cam bolts

40-45 ft.-lbs.

Cam bolts 

40-45 ft.-lbs.

          

Cam thrust plate bolts

8-10 ft.-lbs.

Cam thrust plate bolts

8-10 ft.-lbs.

 

Harmonic damper bolt

70-90 ft.-lbs.

Harmonic damper bolts

70-90 ft.-lbs.

 

Flywheel/flexplate bolts

75-85 ft.-lbs.

Flywheel/flexplate bolts

75-85 ft.-lbs.

 

Pressure plate bolts

35 ft.-lbs.

Pressure plate bolts

35 ft.-lbs.

 

Front cover bolts

12-15 ft.-lbs.

Front cover bolts

12-15 ft.-lbs.

 

 

 

 

351C, 351M 

Fastener Type

Torque Spec

Main cap bolts

95-105 ft.-lbs.

Connecting rod bolts

40-45 ft.-lbs. (45-50 ft.-lbs. for Boss 351C)

Cylinder head bolts (follow factory torque sequence) 

105 ft.-lbs. (125 ft.-lbs. for Boss 351C)

Rocker arms (non-adjustable) 

18-22 ft.-lbs.

5/16 in. intake manifold bolts

21-25 ft.-lbs.

3/8 in. intake manifold bolts

28-33 ft.-lbs.

Oil pump bolt

25 ft.-lbs.

Cam bolts 

40-45 ft.-lbs.

Cam thrust plate bolts

9-12 ft.-lbs.

Harmonic damper bolt

70-90 ft.-lbs.

Flywheel/flexplate bolts

75-85 ft.-lbs.

Pressure plate bolts 

35 ft.-lbs.

Front cover bolts

12-18 ft.-lbs.

 

429-460 

360, 390, 406, 427, 428 FE 

Fastener Type

Torque Spec

 

Fastener Type

 Torque Spec

Maincap bolts

95-105 ft.-lbs.

 

Main cap bolts

95-105 ft.-lbs.

Connecting rod bolts

40-45 ft.-lbs.

 

Crossbolts for 406 and 427

40 ft.-lbs.

Cylinder head bolts

140 ft.-lbs.

 

Connecting rod bolts 

40-45 ft.-lbs. (53-58 ft.-lbs. for 406 and 427)

Rocker arms (non-adjustable)

18-22 ft.-lbs.

 

Cylinder head bolts

80-90 ft.-lbs. (100-110 ft.-lbs. for 1963-67 427)

Intake manifold bolts 

25-30 ft.-lbs.

 

Rocker arm shaft bolts

40-45 ft.-lbs.

Oil pump bolt

25 ft.-lbs.

 

Intake manifold bolts

32-35 ft.-lbs.

Cam bolts

40-45 ft.-lbs.

 

Oil pump bolt

12-15 ft.-lbs.

Harmonic damper bolt 

70-90 ft.-lbs.

 

Cam bolts

40-45 ft.-lbs.

Flywheel/flexplate bolts

75-85 ft.-lbs.

 

Harmonic damper bolt 

70-90 ft.-lbs.

Pressure plate bolts 

35 ft.-lbs.

 

Flywheel/flexplate bolts

75-85 ft.-lbs.

Front cover bolts

12-18 ft.-lbs.

 

Pressure plate bolts

35 ft.-lbs.

 

 

 

Front cover bolts

12-15 ft.-lbs.

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