{"product_id":"arp-subaru-wrx-ej20-ej25-head-stud-kit-260-4701","title":"ARP Subaru WRX EJ20 \u0026 EJ25 Head Stud Kit - 260-4701","description":"\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eARP Head Stud Kit — Subaru EJ20 \/ EJ25 DOHC, 11mm (260-4701)\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eThe clamping force required to keep cylinder heads from lifting under higher combustion pressures. On a boosted EJ that's the whole job — head lift is what kills factory gaskets, and no gasket fixes a fastener problem.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eManufactured from ARP2000 alloy, rated far superior to \"aircraft\" quality\u003c\/strong\u003e, with each stud placed vertically in special racks and precisely heat-treated to 220,000 psi. That vertical racking ensures complete heat penetration rather than dumping pieces in a basket and hoping.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eThreads are rolled after heat treat\u003c\/strong\u003e, giving roughly 1000% better fatigue strength than studs threaded before heat treat — a common practice elsewhere. Centerless ground to assure perfect concentricity, so heads and gaskets align properly during assembly.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eIncludes 12-point nuts and hardened parallel-ground washers for even load distribution and accurate torque readings.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eSpecs:\u003c\/strong\u003e 11mm, ARP2000 material, 220,000 psi tensile strength.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eFitment:\u003c\/strong\u003e Subaru EJ20 and EJ25 DOHC — 02-14 WRX, 04-21 STI, 04-13 Forester XT, 05-12 Legacy GT, plus EJ25D, EJ251, and EJ253 naturally aspirated applications.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003ePair with an MLS head gasket.\u003c\/strong\u003e MLS needs consistent, even clamp load to seal properly, and that's exactly what a stud kit delivers where a torque-to-yield factory bolt can't.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eWorth doing on any EJ that's open.\u003c\/strong\u003e This platform has a long history of gasket failures, and if the engine is apart, this is the cheapest insurance against doing the job twice.\u003c\/p\u003e","brand":"Street Strip Supply","offers":[{"title":"Default Title","offer_id":47280653500589,"sku":null,"price":305.52,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0779\/8105\/7197\/files\/ARP203-4205_3d952474-8bda-4954-ac28-9e38decc0b5c.jpg?v=1787232153","url":"https:\/\/streetstripsupply.com\/products\/arp-subaru-wrx-ej20-ej25-head-stud-kit-260-4701","provider":"Street Strip Supply","version":"1.0","type":"link"}