ARP

When an engine has to cope with more power, higher revs and greater cylinder pressure, the fasteners are often the weak link. ARP makes high-strength bolts and studs for the engine and driveline, so the most critical joints keep their clamping force and don't give way. Here you'll find head stud kits, main studs, rod bolts and much more for both street cars and race cars.

American engine fastener specialist

ARP is an American manufacturer specialising in bolts and studs for motorsport and performance engines. The brand is a well-known name among engine builders in everything from drag racing and track driving to tuned street cars. ARP parts are made from strong steel alloys and have rolled threads, giving a stronger and more fatigue-resistant fastener than many stock bolts. The range covers a large number of engines from American, European and Japanese car makers.

ARP's key products

Head stud kits are one of the most popular purchases, because studs provide more even and accurate clamping force on the cylinder head than regular head bolts. This reduces the risk of a blown head gasket when boost or compression is increased. Main studs keep the main bearing caps securely in place, and rod bolts are critical at high revs. ARP also makes bolts for the flywheel, pressure plate, crank pulley and camshaft, as well as ARP's own assembly lubricant. See each product for engine fitment.

Buy ARP from us

We specialise in performance parts and know what it takes for a project to succeed. You get a wide selection, competitive prices and personal service if you have questions along the way. Find the ARP solution for your project and take the next step towards more performance.

Frequently asked questions

Why choose studs over head bolts?

Studs are threaded into the block and stay in place while the nut is tightened. This gives more consistent clamping force and protects the threads in the block, especially if the head has to come off several times.

Do ARP fasteners need a specific lubricant?

Yes, the torque values ARP specifies normally apply with the recommended lubricant. Always follow the instructions supplied with the kit to achieve the correct clamping force.