What are the torque specs for ARP head studs?
ARP Head Studs, Main Studs, Rod Bolts Torque and Stretch Specs
| U.S. STANDARD TORQUE VALUES Recommended Torque to Achieve Optimum Preload (Clamping Force) | ||
|---|---|---|
| Fastener Tensile Strength | 170,000/180,000 PSI (1,171 Nmm2) | 220,000 PSI (1,515 Nmm2) |
| Fastener Diameter | Torque ARP lube (ft-lbs) | Torque ARP lube (ft-lbs) |
| 1/4″ | 12 | 16 |
| 5/16″ | 24 | 32 |
Do ARP head studs need to be torqued?
Do I need to re-torque my head bolts or studs? If you follow the ARP installation instructions, there should be no need to do a re-torque. However, it may be necessary under certain circumstances if the gasket manufacturer’s instructions require it, particularly if a fire ring has been installed.
Can you change head studs without removing head?
A good rule of thumb is when in doubt, yank it out. High-mileage engines or ones with cylinder pressure issues should have the cylinder head removed and checked, including decking, before installing a new head gasket. Think about studs as preventative medicine.
What does 90 degrees mean on a torque wrench?
90° = quarter turn. 180° = half turn. It’s alright if you are off a few degrees.
Can you reuse ls3 head bolts?
On a GM LS engine, the cylinder head bolts are TTY and cannot be re-used. The connecting rod bolts are also TTY, but can be tightened up to three times for bearing checking. The intake manifold, rocker arm, and rear cover bolts can be reused.
What order do you torque head bolts?
Normally you would tighten conventional head bolts in a crisscross pattern in three steps, to one-third, two-thirds, and then to the final torque. Stretch bolts are tightened in a torque-plus-angle sequence. Various engines use similar but different sequences and specification.