Mopar Big Block Torque Specifications

RB/B Engines - 383, 400, 440
 
Torque specifications are for stock factory type bolts with light engine oil applied to the threads and the underside of the bolt head. Other lubrications offer reduced friction and increased bolt tension, and will affect the torque figure. If using aftermarket performance bolts, you should follow the recommended torque specifications of the aftermarket bolts.
 
*Please Note: Some specifications listed below are in inch-pounds rather than foot-pounds. Over torquing will result in broken bolts.
 

* 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 200 in/lbs 5/16-18
Alternator Adjusting Strap to Block Bolt 30 3/8-16
Alternator Mounting Bolt 30 3/8-16
Camshaft Lockbolt 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 Nut 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 270 in/lbs 5/16-24
Valley Pan End Bolt 9 1/4-20
Valve Cover Stud & Nut 7 1/4-20
Vibration Damper Pulley Bolt 200 in/lbs 5/16-20
Water Pump to Housing Bolt 30 3/8-16
Water Pump Housing to Block Bolt 30 3/8-16
 
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