Flathead V8 General Torque Specifications

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Engine & Transmission Related Torque Settings 
1932 to 48 V8

Bolt Location

Torque Setting Ft. Lbs.

  85-100 HP 60 HP
Main Bearing Bolts or Nuts 80-90 65
Cylinder Head Nuts (cast iron heads) 50-60  
Cylinder Head Nuts (aluminum heads) 35-40 40-45
Connecting Rod Nuts (castellated) 35-40 25
Connecting Rod Nuts (self-locking) 40-45  
Flywheel to Crankshaft (wired) 65-70  
Flywheel to Crankshaft (self-locking) 80  
Exhaust Manifold 25-30  
Intake Manifold 23-28  
Oil Pump to Block 12-15  
Oil Pump Cover Plate 7-10  
Timing Cover Bolts

12-15

 
Camshaft Timing Gear 15-20  

Bolt Location

Torque Setting Ft. Lbs.

  85-100 HP 60 HP
Clutch Pressure Plate Bolts 17-20  
Transmission to Bell Housing 40-50  
Starter Bolts 15-20  
Fuel Pump 6-9  
Spark Plugs (7/8-18 Cast Iron Heads) 34-38  
Spark Plugs (18mm Cast Iron Heads) 28-32  
Spark Plugs (18mm Aluminum Heads) 24-28  
Spark Plugs (14mm Cast Iron Heads) 24-28  
Spark Plugs (14mm Aluminum Heads) 20-24  
Generator Bracket 55-70  
Water Pump Bolts 23-28  
Oil Pan to Block 15-18  

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