Flathead Six General Torque Specifications

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Engine & Transmission Related Torque Settings 
1947 to 51 Six (H series)

Bolt Location

Torque Setting Ft. Lbs.

Main Bearing Bolts or Nuts (self-locking) 95-105
Cylinder Head Bolts (cast iron heads) 65-70
Connecting Rod Nuts (self-locking) 45-50
Flywheel to Crankshaft (wired) 65-70
Flywheel to Crankshaft (self-locking) 75-85
Exhaust Manifold 25-30
Intake Manifold to Exhaust Manifold 30-35
Oil Pump to Block 10-15
Oil Pump Cover Plate  7-10
Timing Cover Bolts

15-18

Camshaft Timing Gear 15-20

Bolt Location

Torque Setting Ft. Lbs.

Clutch Pressure Plate Bolts 17-20
Transmission to Bell Housing 40-50
Starter Bolts 15-20
Fuel Pump 15-20
Spark Plugs (      ) 24-28
Valve Chamber Cover 4-7
Clutch Housing to Block 37-42
Damper to Crankshaft 45-55
Rear Plate to Block 50-60
Generator Bracket 30-40
Water Pump Bolts 27-32
Oil Pan to Block 15-18

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