Engine Bolt Torque Specifications - 426 Hemi, RB, B, LA Engines
These specs are for stock-type bolts with light engine oil applied to the threads and the underside of the bolt head. Moly and other lubes offer reduced friction and increased bolt tension, which will affect the torque figure. If you use aftermarket performance bolts like ARP’s, you should follow the recommended torque specifications.
Please note that some specifications are in inch-pounds rather than foot-pounds. Read the charts carefully to prevent broken bolts due to excessive torqueing.
426 Hemi Engine Torque Specifications
* Torque values shown are in ft/lbs unless otherwise noted
* Follow factory torque sequence
Fastener
Torque
Thread Size
Alternator Adjusting Strap Bolt
15
5/16-18
Alternator Bracket to Block Bolt
30
3/8-16
Alternator Mounting Bolt
30
3/8-16
Camshaft Gear Retaining Bolt
40
3/8-16
Carburetor to Manifold Nut
7
5/16-24
Clutch Housing Bolt
50
7/16-14
Connecting Rod Nut
70
7/16-20
Crankshaft Rear Seal Retainer
30
3/8-16
Crankshaft Bolt (Vibration Damper)
135
3/4-16
Cylinder Head Bolt
70-75
7/16-14
Cylinder Head Stud Nut
70-75
7/16-20
Distributor Clamp Bolt
200 in/lbs
5/16-18
Exhaust Manifold Bolt
35
3/8-16
Fan Attaching Bolt
15
5/16-18
Flywheel Cover Bolt
7
1/4-20
Flywheel Housing to Block Bolt
50
7/16-14
Flywheel to Crankshaft Bolt
70
7/16-14
Fuel Pump to Block
30
3/8-16
Main Bearing Cap Bolt
100
1/2-13
Main Bearing Cap Tie Bolt
45
3/8-16
Oil Pan Drain Plug
20
1/2-20
Oil Pan Bolt
15
5/16-20
Oil Pump Cover Bolt
10
5/16-18
Oil Pump to Block Bolt
30
3/8-16
Rocker Shaft Bolt
30
3/8-16
Spark Plug
30
14mm
Starter Mounting Bolt
50
7/16-14
Timing Cover Bolt – Upper
15-18
5/16-18
Timing Cover Bolt – Lower
15-18
3/8-16
Torque Converter Housing Bolt
30
3/8-16
Torque Converter to Flexplate Bolt
65
7/16-20
Valve Cover Stud & Nut
40in/lbs
1/4-28
Water Pump to Housing Bolt
30
3/8-16
Water Pump Housing to Block Bolt
30
3/8-16
RB/B Engine Torque Specifications Big Block Chrysler 383, 400, 440
* Torque values shown are in ft/lbs unless otherwise noted
* Follow factory torque sequence
Fastener
Torque
Thread Size
A/C Compressor to Engine Bolt
30
3/8-16
Alternator Adjusting Strap Bolt
200in/lbs
5/16-18
Alternator Adjusting Strap to Block Bolt
30
3/8-16
Alternator Mounting Bolt
30
3/8-16
Camshaft Lock Bolt
35
7/16-14
Carburetor to Manifold Nut
7
5/16-24
Clutch Housing Bolt
50
7/16-14
Connecting Rod Nut-Plain
45
3/8-24
Crankshaft Rear Seal Retainer
30
3/8-16
Crankshaft Bolt (Vibration Damper)
135
3/4-16
Cylinder Head Bolt
70
7/16-14
Distributor Clamp Bolt
15
5/16-18
Exhaust Manifold Bolt
30
3/8-16
Exhaust Pipe Flange Nut
50
7/16-20
Exhaust Pipe Clamp Nut
20
3/8-24
Fan Attaching Bolt
15-18
5/16-18
Flywheel Cover Bolt
7
1/4-20
Flywheel Housing to Block Bolt
50
7/16-14
Flywheel to Crankshaft Bolt
55
7/16-20
Fuel Pump to Block
30
3/8-16
Intake Manifold Bolt
40
3/8-16
Main Bearing Cap Bolt
85
1/2-13
Oil Pan Drain Plug
20
1/2-20
Oil Pan Bolt
15
5/16-20
Oil Pump Cover Bolt
10
5/16-18
Oil Pump to Block Bolt
35
3/8-16
Rocker Shaft Bolt
25
3/8-16
Spark Plug
30
14mm
Starter Mounting Bolt
50
7/16-14
Timing Cover Bolt
15
5/16-18
Torque Converter Housing Bolt
30
3/8-16
Torque Converter to Flexplate Bolt
270in/lbs
5/16-24
Valley Pan End Bolt
9
1/4-20
Valve Cover Stud & Nut
7
1/4-20
Vibration Damper Pulley Bolt
200in/lbs
5/16-20
Water Pump to Housing Bolt
30
3/8-16
Water Pump Housing to Block Bolt
30
3/8-16
LA Engine Torque Specifications Small Block Chrysler 273, 318, 340, 360
* Torque values shown are in ft/lbs unless otherwise noted
* Follow factory torque sequence
Fastener
Torque
Thread Size
Camshaft Lock Bolt
35
7/16-14
Carburetor to Manifold Nut
7
5/16-24
Clutch Housing Bolt
30
3/8-16
Connecting Rod Nut-Plain
45
3/8-24
Crankshaft Bolt (Vibration Damper)
135
3/4-16
Cylinder Head Bolt (273 & 318)
85
1/2-13
Cylinder Head Bolt (340 & 360)
95
1/2-13
Flywheel Cover Bolt
100in/lbs
1/4-20
Flywheel Housing to Block Bolt
50
Flywheel to Crankshaft Bolt
55
7/16-20
Fuel Pump to Block
30
3/8-16
Intake Manifold Bolt
35
3/8-16
Main Bearing Cap Bolt
85
1/2-13
Oil Pan Drain Plug
20
1/2-20
Oil Pan Bolt
15
5/16-20
Oil Pump Cover Bolt
95in/lbs
1/4-20
Oil Pump to Block Bolt
35
3/8-16
Rocker Shaft Bolt
30
3/8-16
Spark Plug
30
14mm
Timing Cover Bolt (Cast)
30
3/8-16
Torque Converter to Flexplate Bolt
270in/lbs
5/16-24
Vibration Damper Pulley Bolt
200in/lbs
5/16-20
Water Pump Housing to Block Bolt
30
3/8-16
Address
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Clarkston, MI
48347 U.S.A.
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