Torque specs

ericcarr

Petty Officer 1st Class
Joined
Jul 27, 2009
Messages
291
I will be installing a different intake manifold on my generation 4, 454 L big black motor.
What are the torque specs?
 

Scott Danforth

Grumpy Vintage Moderator still playing with boats
Staff member
Joined
Jul 23, 2011
Messages
50,487


Big Block Chevy Torque Specs​





The following specs apply to:
  • Gen IV, Big Block Chevy
  • Mark V, Big Block Chevy

Fastener Type​
Torque Specs​
Main Cap Bolt (396-427, 2-Bolt)
95 ft.-lbs.​
Main Cap Bolt (396-454, 4-Bolt, Inner and Outer)
110 ft.-lbs.​
3/8 in. Connecting Rod Bolt
50 ft.-lbs.​
7/16 in. Connecting Rod Bolt
67-73 ft.-lbs.​
Cylinder Head Bolts, Long
75 ft.-lbs.​
Cylinder Head Bolts, Short
65-68 ft.-lbs.​
Screw-In Rocker Arm Studs
50 ft.-lbs.​
Intake Manifold Bolts (Cast Iron Head)
25 ft.-lbs.​
Oil Pump Bolt
65 ft.-lbs.​
Cam Sprocket Bolts
20 ft.-lbs.​
Harmonic Damper Bolt
85 ft.-lbs.​
Flywheel/Flexplate Bolts
60 ft.-lbs.​
Pressure Plate Bolts
35 ft.-lbs.​
Bellhousing Bolts
25 ft.-lbs.​
Exhaust Manifold Bolts
20 ft.-lbs.​
 
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