They're typically regular thread.
Small Block Chevrolet Torque Specifications Main cap bolts (oil on threads).....................................................70 ft.-lbs. first set wrench for 45 ft.-lbs and tighten each bolt, then set wrench for 70 ft.-lbs and torque each bolt again. Rod bolts (oil on threads)............................................................45 ft.-lbs. Oil pump bolt (oil on threads).......................................................55 ft.-lbs. Head bolts (sealer on threads).....................................................65 ft.-lbs. Screw-in rocker arm studs (oil on threads)....................................50 ft.-lbs. Cam sprocket bolts (oil on threads)..............................................20 ft.-lbs. Intake manifold bolts (sealer on threads except four corner bolts)....35 ft.-lbs. Harmonic balancer (oil on threads)................................................65 ft.-lbs. Flywheel/flexplate bolts (oil on threads).........................................65 ft.-lbs. Pressure plate bolts (oil on threads)..............................................35 ft.-lbs. These specs are for stock-type bolts, if you are using aftermarket bolts you should follow their recommended torque specifications.
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