Engine bolt torque specs are usually specific to a particular engine. Automotive products manufacturer ARP, however, provides brand-specific torque specs for each of its fasteners. ARP main stud kits come with nuts and washers, in addition to the studs. ARP main studs feature a 200,000 psi tensile strength.
The engine block threads and the studs should be cleaned before installation, and it's important that you use a properly calibrated torque wrench. Lubricate all threads, nuts and washers with ARP's Ultra-Torque fastener lubricant before installation. For permanent stud installation, use a cement adhesive such as Loc-Tite. ARP provides a standard set of torque specifications for its fasteners based on size but advises users to verify listed torque values against the instructions provided with each main stud kit.
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ARP Big Block Chevy Main Stud Kits
Use ARP main stud kit 135-5402 for two-bolt mains in 396, 402, 427 and 454 CID engines. Use kit 135-5601 for four-bolt mains in 396, 402, 427 and 454 CID engines. For two-bolt mains in 396, 402, 427 and 454 CID engines with a windage tray, use ARP main stud kit 235-5502. For four-bolt mains in 396, 402, 427 and 454 CID engines with a windage tray, use kit 235-5701.
For Mark IV aluminium block engines, use ARP main stud kit 135-5603. Use kit 235-5702 for Mark IV bowtie engines with a windage tray; kit 135-5606 for Mark V and VI 502 engines; kit 235-5606 for Mark V and VI 502 engines with a windage tray; and kit 235-5602 for Mark V and VI bowtie blocks with splayed cap outer studs.
Use ARP main stud kit 235-5601 for Dart Big M engines with splayed cap bolts and kit 235-5603 for Dart Big M engines with splayed cap outer studs.
For World Merlin II and III blocks with outer bolts, use ARP main stud kit 135-5801. For World Merlin X aluminium blocks with outer bolts, use kit 135-5607.
1/4-inch Nut Diameter
Torque all 1/4-inch main stud nuts to 14 foot-pounds.
5/16-inch Nut Diameter
Torque all 5/16-inch main stud nuts to 28 foot-pounds.
3/8-inch Nut Diameter
Torque 3/8-inch main stud nuts to 50 foot-pounds.
7/16-inch Nut Diameter
Torque 7/16-inch main stud nuts to 80 foot-pounds.
1/2-inch Nut Diameter
Torque 1/2-inch main stud nuts to 125 foot-pounds.
9/16-inch Nut Diameter
Torque 9/16-inch main stud nuts to 180 foot-pounds.
5/8-inch Nut Diameter
Torque 5/8-inch main stud nuts to 240 foot-pounds.
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