ARP Head Studs & Engine Fasteners

What This Collection Covers

ARP head studs replace factory head bolts with precision-machined threaded studs that thread into the block and allow the nut to be torqued concentrically on a stationary fastener, producing more even and repeatable clamping force across the entire head gasket surface than a factory head bolt design. This collection focuses on the internal engine fasteners that hold the short block and cylinder head together under load.

Alloy Options

ARP offers head stud kits in 8740 chromoly for street performance builds and higher tensile ARP2000 alloy for high-boost applications above 30 psi, giving builders a fastener rated to the specific cylinder pressure and rpm range of their engine.

Head Stud Applications by Platform

ARP head studs are available for a wide range of performance and turbocharged engines including Ford 4.6L and 5.4L Modular V8, VW/Audi 1.8T, BMC B Series, Renault 2.0L F4R, Porsche 3.0L/3.3L, and HEMI 5.7L and 6.1L applications. Each kit is engineered to the specific thread pitch, length, and torque specification of the block it fits, so confirming the exact engine code before ordering is essential.

Main Studs and Rod Bolts

Main stud kits reinforce the block-to-main-cap joint and are commonly installed alongside head studs on forced induction builds like the Ford 4.6L supercharged Cobra, while ARP rod bolt kits upgrade the connecting rod fastener to handle the higher cylinder pressure and rpm loads seen in a built short block.

Why Head Studs Outperform Head Bolts on Boosted Engines

Head studs are preferred on turbocharged and supercharged engines because higher combustion pressures place greater stress on the head-to-block joint, requiring higher and more consistent clamping force to prevent head gasket lift and combustion gas leakage. ARP head studs allow precise torque value targeting using the included ARP Ultra-Torque lubricant, which eliminates friction variation between torque applications and ensures every stud is loaded to the same clamping force, a detail that matters most on engines that see multiple heat cycles and retorquing during break-in.

Pairing Head Studs with Gaskets and Pistons

Head studs are typically installed as part of a broader internal engine refresh or build, which is why they are commonly ordered alongside a new head gasket rated for the same clamping load and, on forced induction or high compression builds, a matching set of forged pistons. Getting the stud, gasket, and piston specifications aligned before assembly prevents mismatched clamp loads or clearance issues during the build.

Installation Notes

ARP head stud installation requires threading the studs hand-tight or with a stud driver into clean, dry threaded holes in the block, then applying ARP Ultra-Torque lubricant to the threads and under the nuts before final torque for accurate readings. Some applications with interference-fit stud holes open to the water jacket require thread sealer on the lower stud thread, which ARP notes in the kit instructions.

Top Internal Engine Brands

• ARP. Head studs, main studs, and rod bolts engineered for repeatable clamp load on nearly every engine platform
• Cometic Gasket. MLS head gaskets designed to pair with ARP stud clamping specifications
• Manley Performance. Forged pistons and connecting rods for built short blocks
• Eagle Specialty Products. Forged connecting rods and crankshafts
• Clevite. Engine bearings rated for high clamp load and rpm
• Total Seal. Piston ring sets engineered for street and race builds

How to Choose the Correct ARP Head Stud Kit

• Confirm the exact engine platform, displacement, and generation before ordering
• Match alloy (8740 chromoly or ARP2000) to your boost and cylinder pressure targets
• Pair the stud kit with a head gasket rated for the same clamping load
• Confirm thread pitch and stud length match your specific block casting
• Check whether main studs should be added alongside head studs for your power level
• Verify the kit includes Ultra-Torque lubricant or budget to purchase it separately
• Review torque specifications and installation instructions included with the kit
• Inspect whether water jacket thread sealant is required on interference-fit holes
• Confirm nut style (12 point versus hex) matches your clearance requirements
• Check for any machining notes specific to aftermarket blocks or decks

Common Questions

Why are head studs preferred over head bolts on boosted engines?

Head studs allow the nut to be torqued on a stationary stud, producing more even clamping load across the head gasket surface. ARP Ultra-Torque lubricant eliminates friction variation between applications, ensuring consistent clamping force critical for high-boost engines.

Do head studs require machining or special installation procedures?

ARP head studs install hand-tight into clean, dry block threads. ARP Ultra-Torque lubricant must be applied to threads and under nuts for accurate torque readings. Some holes open to the water jacket require thread sealer. ARP includes torque specs and instructions with each kit.

What is the difference between ARP 8740 chromoly and ARP2000 head studs?

ARP2000 alloy provides roughly 20 percent higher tensile strength than 8740 chromoly, making it the preferred option for boosted applications above 30 psi, while 8740 chromoly is a strong and cost-effective choice for street performance builds.

Do I need a new head gasket when installing ARP head studs?

Yes, in most cases the cylinder head must be removed to install head studs, so replacing the head gasket at the same time is standard practice. Choose a gasket rated for the clamping load your stud kit and boost level will produce.

Should I upgrade to forged pistons at the same time as head studs?

If the engine is being opened up for boosted or high compression use, upgrading to forged pistons at the same time avoids having to disassemble the short block again later. Naturally aspirated or mild builds can often keep factory pistons.

Can ARP head studs be reused after a rebuild?

Studs can often be reused if they show no damage or stretch, after cleaning and relubricating with Ultra-Torque, but many builders replace them during a full rebuild to eliminate any risk from prior use.

What torque specification should I use for ARP head studs?

Use the torque specification included with your specific ARP head stud kit, since values vary by engine platform, stud diameter, and alloy. Do not substitute a generic torque value.

How long does shipping take on ARP head stud kits?

Most in-stock ARP head stud orders ship the same day from a US warehouse. Delivery typically arrives in 2 to 5 business days.

Do ARP head stud kits include the nuts and washers?

Yes, ARP head stud kits are complete with studs, nuts, and washers along with the Ultra-Torque lubricant and installation instructions needed for the job.

What is the return policy on head stud kits?

Unused kits in original packaging can be returned within 30 days. Kits that have been installed are non-returnable.

Why Buy ARP Head Studs from Black Ops Auto Works

Black Ops Auto Works stocks 812 ARP Head Studs SKUs across 8740 chromoly and ARP2000 alloy options with real fitment data, competitive pricing, and support from staff who build engines themselves. Products are filterable by year, make, model, and engine platform to confirm the correct application before ordering.

For focused shopping, browse our Engine Block, Head Components, Cometic Gasket, and Pistons collections to complete your internal engine build.