ARP Cylinder Head Studs (WRX / STi) 260-4701
This ARP head stud kit is made from 8740 chromemoly steel, 190,000 psi tensile strength. It is precision centerless ground and thread rolled to Mil-S-8879 specs. The kit includes black oxide finish studs, hardened washers, and premium grade nuts. Removing your cylinder head? Don't forget the head gasket! Select from our vast selection of head gaskets below and be sure to check out our Engine Components and Cooling: Cylinder Head Gaskets and Studs section for more information. Replacing that old timing belt is also a great idea! Even if you aren't at the replacement interval it will save you a significant amount of money down the line! See our Engine Components and Cooling: Rebuild Components :: Timing Belt Components section for more information!
Features
- 8740 Chromemoly
- Tensile strength: 190,000 PSI
Applications
- Subaru EJ2.0L
- Subaru 2.5L DOHC
What's in the box?
- (12) ARP head studs
- (12) parallel ground washers
- (12) 8740 chromoly steel 12pt nuts
- (1) .5 oz. pack of ARP Ultra-Torque fastener assembly lubricant
Warranty
Designed to withstand higher RPM conditions.
High strength overlay plate with reduced thickness for improved fatigue properties.
Hardened steel backs on all rod bearings to improve the support of the bearing lining and assist with bearing retention in the housing.
Increased crush for improved bearing retention.
Elimination of flash plating on the back of the bearings to improve heat transfer through the bearing sand to maximize the grip between the bearings and its housing.
Increased eccentricity to compensate for bore distortion at high rpm and to assist in the formation of hydrodynamic oil films.
3/4 grooved Main Bearings to optimize bearing load carrying surface area and oil flow to the conrod bearings.
Tight consistent wall tolerances to help you maintain consistent clearances.
Enlarged ID chamfers on bearing edges where required to accommodate large fillet radius on performance crankshafts.
