Some Notable FAQ From ARP

Do I need to re-torque my head bolts or studs?

If you follow ARP’s installation instructions, re-torquing is usually not needed. However, if the gasket manufacturer’s instructions require it—especially with a fire ring—then it may be necessary. ARP advises not to re-torque on a hot engine.

Do I need lube on my bolts or studs?

Yes. Use ARP Ultra-Torque lube under the bolt head or nut bearing surface and on the threads (unless using a thread sealer). This ensures accurate clamp load and prevents thread galling, especially with stainless steel fasteners.

Can I use Loctite or another thread locker instead of ARP Ultra-Torque?

Yes, you can use blue Loctite on the stud end that goes into the block, but never on the nuts for head or main studs. Do not use Loctite and Ultra-Torque together. Always assemble before the Loctite cures and ensure threads are clean before applying any lubricant or thread locker.

Do I have to use ARP Ultra-Torque?

ARP Ultra-Torque was developed over two years and is the basis for all ARP torque specs. Using other lubricants (like motor oil or moly lube) is at your own risk and may cause failure, for which ARP is not responsible.

Do the threads of the bolts going into the block need lube?

Yes. For blind holes, apply a small amount of Ultra-Torque lube. If studs protrude into a water jacket, clean threads thoroughly and use a liberal amount of ARP thread sealer or high-temp thread sealer instead of Ultra-Torque.

Are ARP bolts and studs reusable?

Yes, if installed and torqued correctly with no visible damage. Replace if you see thread galling, corrosion, or if rod bolts have stretched more than 0.001”. Refer to page 29 of the ARP catalog for detailed reuse guidelines.

Should I install my studs into the block first?

It’s easier to test fit studs, then remove them to install the head gasket and head, and finally reinstall studs. This helps avoid damage to stud threads and cylinder mounting holes. Without alignment dowel pins, studs can help align the gasket and head.

Which way does the chamfer on the washer face?

The chamfered side faces up, toward the bolt head. It provides clearance for the radius between the bolt shank and head.

Are head studs only installed hand tight?

Yes, head studs should be installed finger tight only. Use an allen wrench on the stud end only to ease installation, not to torque. Ensure studs are fully bottomed out in the block threads, not hung up or damaged.

How do I avoid water leaks from newly installed head studs?

Clean threads on both block and studs thoroughly using a thread-cleaning chaser (not a regular tap) and solvent. Use plenty of ARP thread sealer, high-temp silicone, or Loctite on the threads to seal air pockets. Follow ARP’s installation instructions carefully.

Are ARP’s torque specs the same as the vehicle manufacturer’s?

Not always. ARP torque specs are designed to achieve specific clamp loads based on fastener and material type, which may differ from factory specs.

Which torque/stretch spec do I use if my aftermarket rods differ from ARP’s specs?

Always use the torque/stretch specs provided by your rod manufacturer.

What drill size do I need for wheel studs?

Drill size depends on your axle/hub material and stud knurl diameter. See pages 100 & 101 of the ARP catalog for detailed specs and instructions: https://arpcatalog.com/100/

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If you need help in determining whether a product is special order or need assistance you can either give us a call or send us an email to modmyeurocar@gmail.com

Due to ARP's Quality Assurance Programs, AS9100 and lS0 9001, ALL Stock Adjustments, Warranty/Defectives, and Repacks are subject to approval for return to ARP. Any product that is not in Original packaging and does not include Lot and/or Job numbers is not returnable to ARP for any reason because it is not traceable and therefore does not meet AS9100 or lS0 9001 standards. Specials are made-to-order and, as such, cannot be returned for any reason other than defective material and/or manufacturing.

WARRANTY/DEFECTIVES: RMA required'please call or fax for an RMA number. Freight credit will be issued on credit memo; please list your freight costs on your return to receive them. Warranties/Defectives will be inspected by ARP. lf they are found to be repacks, they will be subject to Repack policy below. Repacks are not Defective!

REPACKS: RMA required 'please call or fax for an RMA number. Items being returned for repackaging include items that are missing or have been cut out of skin packages and boxes that have been opened. All repack returns will be charged a 15% restock fee. Return freight is your responsibility. Ship your best way.