{"product_id":"iag-550-street-n25-cylinder-heads-package-w-gsc-s1-cams-lifters-for-18-19-sti-type-ra-19-21-sti","title":"IAG 550 Street N25 Cylinder Heads Package W\/ GSC S1 Cams \u0026 Lifters For 18-19 STI Type RA 19-21 STI","description":"The IAG 550 Cylinder Heads are designed to function as an entry-level replacement for stock OEM heads. If your engine has suffered a catastrophic failure which requires replacement of your cylinder heads, or if you don't have OEM heads to start with, the IAG 550 Cylinder Heads are a perfect solution. These heads also work great for cars with basic bolt-on parts up to 550 BHP. These heads include upgraded GSC standard size valves, GSC Viton Valve Stem Seals, IAG Stage 1 Valve Springs with Titanium Retainers, and OEM Keepers. GSC S1 Camshafts are available with OEM valve lifter buckets. We also offer an optional chamber modification service (see below) for EJ20 heads to allow use on EJ25 short blocks. Each IAG 550 Cylinder Head Set starts with new OEM castings from Subaru of America. Next, you'll select whether or not you want to include our optional GSC camshaft package. If selected, these heads will include new GSC S1 Camshafts and OEM Lifter Buckets for valve adjustment. The bare castings are visually inspected and then fixtured into our in-house Centroid 5-axis CNC Machine. In the Centroid, the heads undergo a cam clearance machining process which removes material from the lifter area where larger lift and duration cam profiles are known to contact the castings. (Just in case you want to go bigger later.) Then the heads are fixtured in our Newen Valve Guide and Seat Machine to cut all intake and exhaust seats with a multi-angle valve job that suits the flow characteristics of GSC's standard size 36mm Intake and 32mm Exhaust valves. At this point, the heads' decks are resurfaced using our TS-3000 BlockMate, which cuts the aluminum to a smooth, even finish. Next, the heads are ultrasonically cleaned to remove debris and oils from the machining process. Finally, the heads are reassembled using GSC Stainless Intake and Exhaust Valves, GSC Viton stem seals, IAG-Stage 1 Valve Springs with Titanium Retainers, and OEM Valve Keepers.\r\n\u003cul\u003e\t\u003cli\u003eNew Head Castings with Upgraded GSC Standard Size Valves, IAG Stage 1 Valve Springs with Titanium Retainers\u003c\/li\u003e\r\n\t\u003cli\u003ePower: The IAG 550 Cylinder Head Package has a power output rating of 550 BHP.\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\r\n\u003cb\u003eVehicle Specific\u003c\/b\u003e\r\n\u003cul\u003e\r\n\u003cli\u003eSubaru: WRX STI 18 - 21 Base \/ Kanrai Edition \/ Limited \/ S209 \/ STI \/ Sport \/ Sport-tech \/ Type RA\u003c\/li\u003e\r\n\r\n\u003c\/ul\u003e\r\n\u003ch3\u003eAttributes:\u003c\/h3\u003e\r\n\u003cp\u003e\u003c\/p\u003e\u003cul\u003e\r\n\u003cli\u003e\n\u003cb\u003eBrand Name: \u003c\/b\u003eIAG Performance\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eGTIN: \u003c\/b\u003e00887753904317\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eAssembled: \u003c\/b\u003eYes\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eCNC-Machined Combustion Chamber: \u003c\/b\u003eYes\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eCNC-Machined Exhaust Runner: \u003c\/b\u003eYes\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eCNC-Machined Intake Runner: \u003c\/b\u003eYes\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eCylinder Head Gasket Included: \u003c\/b\u003eNo\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eExhaust Valve Diameter: \u003c\/b\u003e32\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eExhaust Valve Length: \u003c\/b\u003e104.37\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eExhaust Valve Material: \u003c\/b\u003eStainless Steel\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eExhaust Valve Stem Diameter: \u003c\/b\u003e6\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eGrade Type: \u003c\/b\u003ePerformance\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eIntake Valve Diameter: \u003c\/b\u003e36\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eIntake Valve Length: \u003c\/b\u003e104.40\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eIntake Valve Material: \u003c\/b\u003eStainless Steel\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eIntake Valve Stem Diameter: \u003c\/b\u003e6\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eLength: \u003c\/b\u003e20\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eMaterial: \u003c\/b\u003eAluminum\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eMounting Hardware Included: \u003c\/b\u003eYes\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003ePower Rating: \u003c\/b\u003e550 BHP\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eValve Covers Included: \u003c\/b\u003eNo\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eValve Seal Material: \u003c\/b\u003eViton\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eValve Seals Included: \u003c\/b\u003eYes\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eValve Spring Retainer Material: \u003c\/b\u003eTitanium\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eValve Spring Retainers Included: \u003c\/b\u003eYes\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eValve Springs Included: \u003c\/b\u003eYes\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eValves Included: \u003c\/b\u003eYes\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eWeight: \u003c\/b\u003e72\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eWidth: \u003c\/b\u003e16\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\r\n\u003ch3\u003eExtended Information:\u003c\/h3\u003e\r\n\u003cp\u003e\u003c\/p\u003e\u003cul\u003e\r\n\u003cli\u003e\n\u003cb\u003eCountry of Origin: \u003c\/b\u003eUS\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eEmissions : \u003c\/b\u003e4\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eLife Cycle Status: \u003c\/b\u003eAvailable To Order\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\r\n\u003ch3\u003ePacking Information:\u003c\/h3\u003e\r\n\u003cp\u003e\u003c\/p\u003e\u003cul\u003e\r\n\u003cli\u003e\n\u003cb\u003eQuantity of Each: \u003c\/b\u003e1\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003ePackage UOM: \u003c\/b\u003eEA\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eDimension: \u003c\/b\u003e20 x 16 x 12 inches\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eWeight: \u003c\/b\u003e40 POUNDS\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\r\n\u003ch3\u003ePDF:\u003c\/h3\u003e\r\n\u003cp\u003e\r\n\u003c\/p\u003e\u003cdiv\u003e\u003ca href=\"https:\/\/sdda.semadata.org\/Standard\/IAG%20Performance\/IAG%20Break%20In-INSTRUCTIONS.pdf\" target=\"_blank\"\u003e\u003cimg src=\"data:image\/png;base64,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\" style=\"display:inline\"\u003e \u003c\/a\u003e\u003c\/div\u003e\r\n\r\n\u003cdiv id=\"sema-product-fitment\" class=\"product__accordion accordion fitment\"\u003e\u003c\/div\u003e","brand":"IAG Performance","offers":[{"title":"Default Title","offer_id":47104019071199,"sku":"JGJS-IAG-ENG-H550NL","price":5149.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0528\/7972\/0636\/files\/IAG-ENG-H550NL-01.jpg?v=1751549799","url":"https:\/\/felixperformance.com\/products\/iag-550-street-n25-cylinder-heads-package-w-gsc-s1-cams-lifters-for-18-19-sti-type-ra-19-21-sti","provider":"FelixPerformance","version":"1.0","type":"link"}