Pro Series Cylinder Head Stud by ARP®. All Pro Series bolts are cold-forged to ensure molecular integrity, heat-treated prior to thread rolling and machining, and meet the ARP "ZERO defect - ZERO failure" quality standard. ARP Pro Series head bolt kits are application specific and designed to deliver superior strength typically associated with competition engines. All Pro Series head bolts have a reduced wrenching hex or 12-point head and wide area flange to permit the use of larger diameter valve springs and eliminate the need for valve train removal during cylinder head retorquing. Most applications have undercut short bolts that can help eliminate head gasket failures through providing more "stretch" to compensate for the additional compression of gaskets.
- Designed to unlock more performance out of your vehicle
- Deliver a reasonable balance of strength and durability
- Premium construction built with unmatched quality standards
- Ensure smooth, reliable operation and long-lasting service
ARP® was established back in 1968 by Gary Holzapfel who was passionate about creating reliable fasteners for the automotive industry. The company's dedication to total customer satisfaction has allowed it to grow from a garage workshop into a leading source for high quality fastening solutions. Today with five operational entities located in Southern California and a combined area of more than 200,000 square feet, ARP stands ready to provide customers with virtually every fastener found in an engine and driveline. The brand's product list ranges from high performance OEM replacement parts to specialty hardware for racing and marine applications.