Showing 25–45 of 45 results
ARP by vehicle
Showing 25–45 of 45 results
Studs or bolts
A head stud kit swaps the factory head bolts for studs that stay in the block, with a nut doing the clamping. The block threads are not worked each time the head comes off and the clamping is more consistent, which is why studs are common on a diesel running more boost or a V8 making serious power. A bolt kit is the straight replacement for the factory bolts.
Factory head bolts on many engines, the LS included, are stretch bolts that should not be refitted, so a head job needs new fasteners either way.
Reading the listing titles
The titles carry the details that decide fitment. ARP2000 names the stud material, a stronger grade than ARP's standard chromoly, and 12 point describes the nut or bolt head. LS head bolt kits are split by block: LS1 engines up to 2003 take staggered-length bolts, engines from 2004 take same-length bolts, and the LS9 has its own kit. Cummins head stud kits are split between 12 valve (1989 to 1998) and 24 valve engines, and the Dart LS Next block has its own 4 and 6 bolt per cylinder kits.
Fitting them with the rest of the job
Diesel head studs usually go in during a head gasket job or a rebuild, often alongside a tune or a bigger turbo. Use ARP's torque figures and the assembly lube they specify, and have the block deck and threads checked while the head is off. Head gaskets are under gaskets and seals and the rest of the bottom end under engine internals. Cummins and Duramax owners will find more parts under Double Duty Diesel, and we can fit studs as part of an engine rebuild at Oxley or Warana.
ARP stud kit FAQs
Do I need head studs on a tuned diesel?
Not for every tune. Studs earn their place when boost and cylinder pressure go well past standard, or when the head is coming off anyway and the engine will carry more load than it was built for. Tell us the engine and what the build is aiming for, and we will say whether a stud kit is worth it.
Which ARP head bolt kit fits my LS?
It depends on the block. LS1 engines up to 2003 use staggered-length head bolts, engines from 2004 use same-length bolts, and the LS9 has its own kit. A Dart LS Next block takes its own stud kits. If you are not sure which block you have, send us the engine number.
What comes in an ARP head stud kit?
A full set of ARP studs, washers and nuts, plus a pack of ARP High Torque lubricant. The 1HD-T and 1HZ kit, at $1,150.00, also comes with an instruction sheet.
How quickly do ARP parts ship?
ARP parts that show as in stock and are ordered before 11am AEST on a business day are dispatched the same day. If a kit shows as available to order, the product page gives its dispatch time.
