{"title":"Engine Internals","description":"","products":[{"product_id":"arp-head-stud-kit-subaru-fa20-2-ol-4-cylinder","title":"ARP Head Stud Kit, Subaru FA20 2.oL 4-Cylinder","description":"\u003cp\u003ePN: 260-4301\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eARP only uses premium grade 8740 alloy and a proprietary ARP2000 Alloy that are rated far superior to \"air-craft\" quality allow steels. Secondly, each stud is placed vertically into special racks and precisely heat-treated to 190,000psi for the 8740 material and 220,000psi for the ARP2000 material. This procedure ensures complete heat penetration and the results are far superior to those lesser quality studs from other manufacturers who just dump pieces in a basket and hope for the best. Following heat-treat, each stud is centerless ground to make it as close to perfectly concentric as possible. This procedure involves about ten very slight cuts and results in an exceptionally straight part. It’s important to note that lesser quality studs are not even centerless ground – the material is thread rolled in bar stock form (mostly before heat-treat, when the material is easier to machine). Because ARP studs are manufactured to such exacting tolerances, you will note that gaskets and cylinder heads literally glide into position and are perfectly aligned – something that won’t happen with inferior quality head studs. ARP studs are thread rolled after heat-treat, which gives them about 1000% (that’s ten times) better fatigue strength than those studs that are threaded prior to heat-treat (a very common industry practice). It costs a lot more to do it this way, because it’s tough on tooling, but the results are well worth the extra effort. You will also note that ARP offers specially undercut studs for several engines. This procedure (done only to the shorter studs) more equalizes the “stretch” of both studs, which makes for a more consistent clamping force – and one that compensates for head gasket compression when the cylinder heads are installed. This helps prevent blown head gaskets, and assures optimum engine sealing!\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eApplications:\u003c\/strong\u003e 2013 - Current BRZ\u003c\/p\u003e","brand":"ARP","offers":[{"title":"Default Title","offer_id":20900136058939,"sku":"260-4301","price":322.69,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0131\/5533\/6251\/products\/260-4301_c3aa6808-1a8a-45e5-9758-7ea736f67acd.jpg?v=1556832317"},{"product_id":"new-arp-head-stud-kit-for-subaru-ej20-ej25-dohc","title":"NEW ARP Head Stud Kit for Subaru EJ20 \u0026 EJ25 DOHC","description":"\u003cdiv data-mce-fragment=\"1\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan style=\"color: #ff2a00;\" data-mce-style=\"color: #ff2a00;\" data-mce-fragment=\"1\"\u003e\u003cem data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eShipping included to lower 48 states! \u003c\/strong\u003e\u003c\/em\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cbr\u003ePart No: 260-4701\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\n\u003cbr\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003eThis a brand new in box and factory sealed ARP Subaru EJ20\/EJ25 Head Stud Kit upgrade. This ARP 11mm Head Stud Kit is great for those who are going to be running more power and to prevent head lifting when running at higher boost levels. \u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eMade using premium grade alloy materials that deliver superior fatigue cycle life\u003c\/span\u003e\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e11mm profile\u003c\/span\u003e\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eEach stud is placed vertically in special racks \u003c\/span\u003e\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eHeat treated to 220,000 psi\u003c\/span\u003e\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eThread-rolled to provide 1000% better fatigue strength\u003c\/span\u003e\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eResistance to atmospheric corrosion and oxidation\u003c\/span\u003e\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eIncludes (12) head studs\u003c\/span\u003e\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eIncludes (12) 12-point nuts\u003c\/span\u003e\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eIncludes (12) washers\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003eApplications： \u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\n\u003cul\u003e\n\u003cli\u003e2002-2014 WRX\u003c\/li\u003e\n\u003cli\u003e2004-2021 STI\u003c\/li\u003e\n\u003cli\u003e2004-2013 Forester (XT models only)\u003c\/li\u003e\n\u003cli\u003e2005-2012 Legacy (GT models only)\u003c\/li\u003e\n\u003cli\u003e2005-2009 Outback (XT models only)\u003cbr\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong data-mce-fragment=\"1\"\u003eNOTE: ALL Clearance are final and sold \"As-is\" with no warranty.  No returns, exchanges or refunds.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0131\/5533\/6251\/files\/warning-symbol_2048x2048.gif?v=1554249962\" alt=\"\" width=\"17\" height=\"16\"\u003eWARNING:\u003cspan\u003e \u003c\/span\u003e\u003c\/b\u003e\u003cspan\u003eThis product can expose you to chemicals which are known to the State of California to cause cancer and reproductive harm. For more information, visit \u003c\/span\u003e\u003ca href=\"https:\/\/www.p65warnings.ca.gov\/\" target=\"_blank\"\u003ewww.P65Warnings.ca.gov\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Mann Engineering","offers":[{"title":"Default Title","offer_id":40234451599395,"sku":"260-4701","price":210.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0131\/5533\/6251\/files\/260_4701_arp_ej_head_stud_kit_1.jpg?v=1705367086"},{"product_id":"brand-new-cosworth-subaru-wrx-sti-ej25-ej20-11mm-head-studs","title":"Brand New - Cosworth Subaru WRX STI EJ25\/EJ20 11mm Head Studs","description":"\u003cdiv data-mce-fragment=\"1\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan style=\"color: #ff2a00;\" data-mce-fragment=\"1\" data-mce-style=\"color: #ff2a00;\"\u003e\u003cem data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eShipping included to lower 48 states! \u003c\/strong\u003e\u003c\/em\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\n\u003cdiv\u003e\n\u003cdiv\u003ePart No. \u003cspan\u003e20002440\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003eThis is a genuine\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eCosworth\u003c\/span\u003e Subaru WRX STI EJ25\/EJ20 11mm Head Studs. This is a brand new set that has never been installed and opened only for pictures. This is for Subaru EJ20 and EJ25 engines.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eApplications:\u003c\/div\u003e\n\u003cdiv\u003e- 2002 - 2014 WRX\u003c\/div\u003e\n\u003cdiv\u003e- 2004 - 2021 STI\u003c\/div\u003e\n\u003cdiv\u003e- 2004 - 2013 Forester 2.5XT\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e- 2005 - 2012 Legacy 2.5GT\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e- 2005 - 2009 Outback 2.5XT\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cstrong data-mce-fragment=\"1\"\u003eNOTE: ALL Clearance are final and sold \"As-is\" with no warranty.  No returns, exchanges or refunds.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003e\u003cimg height=\"16\" width=\"17\" alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0131\/5533\/6251\/files\/warning-symbol_2048x2048.gif?v=1554249962\"\u003eWARNING:\u003cspan\u003e \u003c\/span\u003e\u003c\/b\u003e\u003cspan\u003eThis product can expose you to chemicals which are known to the State of California to cause cancer and reproductive harm. For more information, visit \u003c\/span\u003e\u003ca href=\"https:\/\/www.p65warnings.ca.gov\/\" target=\"_blank\"\u003ewww.P65Warnings.ca.gov\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Mann Engineering","offers":[{"title":"Default Title","offer_id":40589612482595,"sku":"20002440","price":500.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0131\/5533\/6251\/files\/20002440_cosworth_subaru_ej_head_studs_1.jpg?v=1727213885"}],"url":"https:\/\/www.mann-engineering.com\/collections\/engine-internals\/arp-head-stud-kit.oembed","provider":"Mann Engineering","version":"1.0","type":"link"}