{"title":"Head Stud","description":null,"products":[{"product_id":"arp-main-stud-kit-204-5408","title":"ARP Main Stud Kit - 204-5408","description":"\u003cp\u003eARP main stud kit for compatible Audi\/VW 2.0T EA113 engine builds, including selected A3\/S3 8P, TT 8J, GTI Mk5 and Golf R Mk6. 8740 alloy steel studs with nuts and hardened washers. Verify block and main-cap compatibility and follow ARP installation specifications.\u003c\/p\u003e","brand":"ARP","offers":[{"title":"Default Title","offer_id":67880712241472,"sku":"204-5408","price":354.95,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0985\/1152\/0064\/files\/204-5408-clean.webp?v=1793340388"},{"product_id":"integrated-engineering-holdstrong-head-studs-audi-s4-b9-s5-rs5-f5-sq5-fy-iehsvz1","title":"Integrated Engineering HoldStrong Head Studs - Audi S4 B9 \/ S5-RS5 F5 \/ SQ5 FY - IEHSVZ1","description":"\u003cp\u003eIE HoldStrong cylinder-head studs using rolled threads and chromium H11 tool steel. Confirm engine compatibility and use the manufacturer's installation, lubricant and tightening specifications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003ePart number:\u003c\/strong\u003e IEHSVZ1\u003c\/p\u003e","brand":"Integrated Engineering","offers":[{"title":"Default Title","offer_id":67881202778432,"sku":"IEHSVZ1","price":1225.95,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0985\/1152\/0064\/files\/IEHSVZ1_01_720x_ddb2a081-4ab6-4afb-91f1-47387ef6a2fd.jpg?v=1793073851"},{"product_id":"arp-main-stud-kit-151-5407","title":"ARP Main Stud Kit 151-5407","description":"\u003cp\u003eThere are many important reasons to use ARP main stud kits, including the elimination of main cap walk and fretting, as well as protecting the threads in your engine block. All kits come complete with hardened parallel-ground washers and high quality nuts. Some applications have provisions for mounting windage trays and have specially designed standoff studs with serrated lock nuts to position the windage tray and lock it securely in place. The studs are manufactured from 8740 chrome moly steel, heat-treated in-house to 200,000 psi tensile strength, and precision J-form threads rolled after heat-treat to create a fastener that has threads 1000% stronger than others.\u003c\/p\u003e","brand":"ARP","offers":[{"title":"Default Title","offer_id":67894376038720,"sku":"151-5407","price":408.95,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0985\/1152\/0064\/files\/151-5407.jpg?v=1793182638"},{"product_id":"arp-2000-main-stud-kit-nissan-300zx-z32-vg30de-dett-102-5402","title":"ARP 2000 Main Stud Kit - Nissan 300ZX Z32 (VG30DE\/DETT) 102-5402","description":"\u003cp\u003eThere are many important reasons to use ARP main stud kits, including the elimination of main cap walk and fretting, as well as protecting the threads in your engine block. All kits come complete with hardened parallel-ground washers and high quality nuts. Some applications have provisions for mounting windage trays and have specially designed standoff studs with serrated lock nuts to position the windage tray and lock it securely in place. The studs are manufactured from 8740 chrome moly steel, heat-treated in-house to 200,000 psi tensile strength, and precision J-form threads rolled after heat-treat to create a fastener that has threads 1000% stronger than others.\u003c\/p\u003e","brand":"ARP","offers":[{"title":"Default Title","offer_id":67894921953600,"sku":"102-5402","price":225.95,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0985\/1152\/0064\/files\/102-5402.jpg?v=1793187616"},{"product_id":"roger-clark-motorsport-extreme-high-performance-11mm-head-stud-kit-rcm1540","title":"Roger Clark Motorsport Extreme High Performance 11mm Head Stud Kit RCM1540","description":"\u003ca href=\"https:\/\/www.prospeedracing.com.au\/products\/roger-clark-motorsport-rcm-extreme-high-performance-11mm-head-stud-kit.html\" style=\"text-decoration:none\"\u003e \u003c\/a\u003e\u003cp\u003e\u003cspan\u003eThe RCM1540 Extreme 11mm Head Stud kit is an absolute must for your performance build.  Manufactured from Aircraft Grade S99 Steel, and with a tensile strength in excess of 237,000 Psi (1640MPa), our 11mm kit reduces head movement under boost, and provides optimum head to block clamping, ably dealing with the higher combustion pressures associated with a modified performance engine, up to around 450Bhp.\u003c\/span\u003e\u003c\/p\u003e \u003ca href=\"https:\/\/www.prospeedracing.com.au\/products\/roger-clark-motorsport-rcm-extreme-high-performance-11mm-head-stud-kit.html\" style=\"text-decoration:none\"\u003e \u003c\/a\u003e","brand":"Roger Clark Motorsport (RCM)","offers":[{"title":"Default Title","offer_id":67903006474560,"sku":"RCM1540","price":1451.95,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0985\/1152\/0064\/files\/RCM1540_df45e9cf-b430-4ce7-a450-e620906e3dff.jpg?v=1793263252"},{"product_id":"iag-performance-arp-1-2-head-stud-set-iag-eng-1700","title":"IAG Performance ARP 1\/2\" Head Stud Set IAG-ENG-1700","description":"\u003ca href=\"https:\/\/www.prospeedracing.com.au\/IAG-Performance-ARP-1\/2-Head-Stud-Set-Subaru-WRX\/STI\/FXT\/LGT-EJ20\/EJ25\/FA20DIT-IAG-ENG-1700\" style=\"text-decoration:none\"\u003e \u003c\/a\u003e\u003cp\u003eThe IAG Performance 1\/2 Inch Head Stud Set is manufactured by ARP and is designed for use on high horsepower Subaru EJ25 and FA20 DIT engines. Due to the larger size of the head studs, a greater load can be placed on the fasteners and in turn it aids in preventing cylinder heads from lifting in race applications. The larger size of the head studs requires the case halves to be drilled and tapped. The cylinder heads will also require drilling to accept the larger studs.\u003c\/p\u003e  \u003cp\u003e \u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eVehicle Fitment:\u003c\/strong\u003e\u003c\/p\u003e  \u003cul\u003e \t\u003cli\u003e1994-2000 Subaru WRX\u003c\/li\u003e \t\u003cli\u003e2001-2007 Subaru WRX\u003c\/li\u003e \t\u003cli\u003e2008-2014 Subaru WRX\u003c\/li\u003e \t\u003cli\u003e2015-2021 Subaru WRX\u003c\/li\u003e \t\u003cli\u003e1994-2000 Subaru STI\u003c\/li\u003e \t\u003cli\u003e2001-2007 Subaru STI\u003c\/li\u003e \t\u003cli\u003e2008-2014 Subaru STI\u003c\/li\u003e \t\u003cli\u003e2015-2021 Subaru STI\u003c\/li\u003e \t\u003cli\u003e1997-2002 Subaru Forester GT\u003c\/li\u003e \t\u003cli\u003e2003-2008 Subaru Forester XT\u003c\/li\u003e \t\u003cli\u003e2008-2013 Subaru Forester XT\u003c\/li\u003e \t\u003cli\u003e1989-1993 Subaru Liberty RS\u003c\/li\u003e \t\u003cli\u003e1993-1997 Subaru Liberty RS\u003c\/li\u003e \t\u003cli\u003e1998-2003 Subaru Liberty B4\u003c\/li\u003e \t\u003cli\u003e2004-2009 Subaru Liberty GT\u003c\/li\u003e \u003c\/ul\u003e \u003ca href=\"https:\/\/www.prospeedracing.com.au\/IAG-Performance-ARP-1\/2-Head-Stud-Set-Subaru-WRX\/STI\/FXT\/LGT-EJ20\/EJ25\/FA20DIT-IAG-ENG-1700\" style=\"text-decoration:none\"\u003e \u003c\/a\u003e","brand":"IAG Performance","offers":[{"title":"Default Title","offer_id":67903007654208,"sku":"IAG-ENG-1700","price":1160.95,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0985\/1152\/0064\/files\/IAG-ENG-1700_5e8e4097-5755-4721-b64a-d8d6d503c462.jpg?v=1793263279"},{"product_id":"roger-clark-motorsport-extreme-high-performance-14mm-head-stud-kit-rcm593","title":"Roger Clark Motorsport EXTREME High Performance 14mm Head stud kit RCM593","description":"\u003cp\u003e\u003ca href=\"https:\/\/www.prospeedracing.com.au\/products\/roger-clark-motorsport-rcm-extreme-high-performance-14mm-head-stud-kit.html\" style=\"text-decoration:none\"\u003e \u003c\/a\u003e\u003c\/p\u003e  \u003cp\u003eDesigned for the ultimate in engine performance and reliability and derived from the rigors of the World Rally Championship, RCM’s 14mm\/14mm Head Stud Kit has consistently proven itself as a must have component of any EJ20\/22\/25 engine build where 500bhp+ power output is expected. It is essential engines modified to this level have the most reliable system for clamping the cylinder heads onto the block assembly to avoid the heads lifting under load at high levels of boost pressure. The RCM 14\/14mm Head Stud kit provides this peace of mind!\u003c\/p\u003e  \u003cp\u003eNow used in many of the fastest and most powerful Imprezas across the globe the RCM 14\/14mm Head Stud Kit is quite simply the foundation on which all our high bhp engine conversions (including Gobstopper and Gobstopper 2) race engines are built around. Replacing the conventional 11mm Subaru cylinder head bolts with a series of 14mm precisely manufactured super high tensile, aircraft grade S99 steel stud and nut system offers many advantages when building your engine. With a tensile strength much higher than that of the OE bolts and the increased stability provided by the RCM studs larger diameter when further combined with the more uniform clamping force provided by the stud and nut arrangement it is clear why so many championship winning engines run these kits!\u003c\/p\u003e  \u003cp\u003e \u003c\/p\u003e  \u003cp\u003e \u003c\/p\u003e  \u003cp\u003e\u003cspan\u003e \u003c\/span\u003e\u003c\/p\u003e  \u003cp\u003e\u003ca href=\"https:\/\/www.prospeedracing.com.au\/products\/roger-clark-motorsport-rcm-extreme-high-performance-14mm-head-stud-kit.html\" style=\"text-decoration:none\"\u003e \u003c\/a\u003e\u003c\/p\u003e","brand":"Roger Clark Motorsport (RCM)","offers":[{"title":"Default Title","offer_id":67903009816896,"sku":"RCM593","price":967.95,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0985\/1152\/0064\/files\/RCM593_9fe23244-5414-464f-b24f-542bb49c0f76.jpg?v=1793263326"},{"product_id":"iag-950-ej20-closed-deck-case-halves-for-14mm-head-studs-subaru-wrx-sti-fxt-lgt-ej20-iag-eng-c955","title":"IAG 950 EJ20 Closed Deck Case Halves For 14mm Head Studs - Subaru WRX\/STI\/FXT\/LGT (EJ20) IAG-ENG-C955","description":"\u003cp\u003eI\u003cstrong\u003eAG 950 EJ20 CLOSED DECK CASE\u003c\/strong\u003e\u003c\/p\u003e  \u003cp\u003e \u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003ePOWER RATING\u003c\/strong\u003e\u003c\/p\u003e  \u003cp\u003eThe IAG 950 Closed Deck Case has a power output rating of 950 BHP\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003ePLANNING TO BUILD YOUR OWN ENGINE? START HERE\u003c\/strong\u003e\u003c\/p\u003e  \u003cp\u003eIt's no secret that the OEM Subaru case halves, or \"block,\" aren't exactly the strongest. IAG has developed a process to greatly improve the strength of the OEM Subaru EJ20 Case Halves to combat the effects of high cylinder pressures brought on by increased power and boost. Our proprietary \"Closed Deck\" System works by supporting the top of the cylinder in the weakest areas and prevents movement and expansion which can lead to cracks and failures. Despite the additional material supporting the cylinder walls, there is no concerns with overheating or coolant flow because the area around the middle of the cylinder still maintains the same coolant area. The custom IAG closed deck inserts are machined with holes for oil and coolant to pass through the same as stock. The IAG 950 Closed Deck Case takes the strength one step further by adding provisions for our race-proven Fire-Lock™ head gaskets system, along with modifications for 14mm head studs. If you're one of those people who prefer to do your own builds we now offer our legendary closed deck case halves for purchase separately. Simply install your crank, rods, and pistons to your own specifications and be confident that the case halves will take the power and prevent common cylinder wall failures.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eTHE IAG CLOSED DECK PROCESS\u003c\/strong\u003e\u003c\/p\u003e  \u003cp\u003eThe IAG Closed Deck conversion is performed 100% in-house by our engineers and experts using state-of-the-art equipment. The IAG Closed Deck starts with a new OEM EJ20 bare case. The case is loaded and fixtured to a 4th axis rotary indexer in our Haas VF4-SS CNC Vertical Machining Center. It is supported by the main journals using a precision ground 2-inch bar and tailstock which ensures the datum is the main journals. This method gives us a true reference point to perform all machining operations. A Rennishaw probe is utilized to check that the case is fixtured true, and once confirmed the machining process begins.\u003c\/p\u003e  \u003cp\u003eOnce the case is fixtured, the first step is to mill out 12 pockets for CNC inserts. Rather than attempting to install inserts into an inconsistent cast case, the pockets are milled out to exact dimensions creating a consistent area that accepts our precision inserts. Once the pockets are machined, the case is removed from the mill and placed into a block oven at a low temperature. Our pre-machined closed-deck inserts are simultaneously chilled using dry ice. When the case and inserts have reached our desired temperature, they are moved into our install station, which holds the block and lightly presses the inserts into position on one side of the deck surface. This process is repeated on the other side and then the partially completed case is moved to a cooling rack. In the next step of our process, the case is loaded and fixtured back into the VF-4SS after reaching room temperature. During this stage, the flanges left from machining the inserts are milled close to the case deck surface. Features such as coolant passages and case bolt access positions are machined. Finally, each deck surface is machined true and flat using a Poly Crystal Diamond insert.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eFIRE-LOCK™ READY\u003c\/strong\u003e\u003c\/p\u003e  \u003cp\u003eThe IAG 950 EJ20 Closed Deck Case features our provisions for our propietary \"Fire-Lock™\" Head gasket system. This system has been proven in our record setting race cars to be the strongest Subaru head gasket system ever produced. To achieve these results our engineers separated the combustion chamber sealing from the fluid sealing aspects of the head gaskets. Our machinists carefully machine a lip at the top of each cylinder to accept the \"Fire-Lock\" ring. With the ring locked in place, it stands proud above the deck, providing a superior seal. The separate gasket bodies take care of sealing oil and coolant passges and keeping them out of the combustion chamber. The IAG 950 Case is also machineed to accept 14mm Head studs (Not Included) to ensure proper head gasket seal.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eSPECIALLY DESIGNED INSERTS\u003c\/strong\u003e\u003c\/p\u003e  \u003cp\u003eOur machining process converts the semi-open deck to a complete closed deck and features the use of cast insert material that closely matches the metallurgy of the aluminum case material in a factory Subaru EJ engine block. By using a similar cast material (rather than billet), we ensure that during expansion and contraction the materials grow and shrink at similar rates, which is vital for maintaining roundness within the top of the bore. The outer inserts are machined from ¾\" cast material and the inner inserts from 1-inch cast material. Once the deck is surfaced, the result is a true ½ inch finished outer insert thickness and true ¾ inch finished inner insert thickness.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eFINAL BORE AND HONE\u003c\/strong\u003e\u003c\/p\u003e  \u003cp\u003eEvery IAG Closed Deck case must be bored and honed after the closed deck process. During the closed deck process the cylinder walls become slightly distorted and an overbore must be performed to the correct this distortion and prepare the block to accept new pistons. EJ25 Case Halves must use 99.75mm pistons and EJ20 Case Halves must use 92.5mm pistons. \u003c\/p\u003e  \u003cp\u003e \u003c\/p\u003e  \u003cp\u003e \u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eIAG 950 EJ20 Closed Deck Case Includes:\u003c\/strong\u003e\u003c\/p\u003e  \u003cul\u003e \t\u003cli\u003e(x1) IAG 950 Closed Deck Converted Case Halves (Using brand new EJ20 Case \/ Stock Bore 92mm) \u003cstrong\u003e*92.5mm Bore and hone additional and required before final assembly!\u003c\/strong\u003e\n\u003c\/li\u003e \t\u003cli\u003e(x1) Machined for OEM 14mm Head Studs (Head Studs Sold Separately)\u003c\/li\u003e \t\u003cli\u003e(x1) Machined for Fire-Lock™ Head Gaskets (Gaskets Sold Separately)\u003c\/li\u003e \u003c\/ul\u003e  \u003cp\u003e \u003c\/p\u003e  \u003cp\u003e \u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eVehicle Fitment:\u003c\/strong\u003e\u003c\/p\u003e  \u003cul\u003e \t\u003cli\u003e1999-2005 Subaru WRX (EJ20)\u003c\/li\u003e \t\u003cli\u003e1999-2005 Subaru STI (EJ20)\u003c\/li\u003e \t\u003cli\u003e1997-2002 Subaru Forester XT (EJ20)\u003c\/li\u003e \t\u003cli\u003e1998-2006 Subaru Liberty GT (EJ20)\u003c\/li\u003e \t\u003cli\u003e1998-2006 Subaru Outback XT (EJ20)\u003c\/li\u003e \u003c\/ul\u003e","brand":"IAG Performance","offers":[{"title":"Default Title","offer_id":67903041306944,"sku":"IAG-ENG-C955","price":7094.95,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0985\/1152\/0064\/files\/IAG-ENG-C955.jpg?v=1793264335"},{"product_id":"iag-750-ej20-closed-deck-case-halves-for-11mm-head-studs-iag-eng-c755","title":"IAG 750 EJ20 Closed Deck Case Halves For 11mm Head Studs IAG-ENG-C755","description":"\u003cp\u003eI\u003cstrong\u003eAG 750 EJ20 CLOSED DECK CASE\u003c\/strong\u003e\u003c\/p\u003e  \u003cp\u003e \u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003ePOWER RATING\u003c\/strong\u003e\u003c\/p\u003e  \u003cp\u003eThe IAG 750 Closed Deck Case has a power output rating of 750 BHP\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003ePLANNING TO BUILD YOUR OWN ENGINE? START HERE\u003c\/strong\u003e\u003c\/p\u003e  \u003cp\u003eIt's no secret that the OEM Subaru case halves, or \"block,\" aren't exactly the strongest. IAG has developed a process to greatly improve the strength of the OEM Subaru EJ20 Case Halves to combat the effects of high cylinder pressures brought on by increased power and boost. Our proprietary \"Closed Deck\" System works by supporting the top of the cylinder in the weakest areas and prevents movement and expansion which can lead to cracks and failures. Despite the additional material supporting the cylinder walls, there is no concerns with overheating or coolant flow because the area around the middle of the cylinder still maintains the same coolant area. The custom IAG closed deck inserts are machined with holes for oil and coolant to pass through the same as stock. If you're one of those people who prefer to do your own builds we now offer our legendary closed deck case halves for purchase separately. Simply install your crank, rods, and pistons to your own specifications and be confident that the case halves will take the power and prevent common cylinder wall failures.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eTHE IAG CLOSED DECK PROCESS\u003c\/strong\u003e\u003c\/p\u003e  \u003cp\u003eThe IAG Closed Deck conversion is performed 100% in-house by our engineers and experts using state-of-the-art equipment. The IAG Closed Deck starts with a new OEM EJ20 bare case. The case is loaded and fixtured to a 4th axis rotary indexer in our Haas VF4-SS CNC Vertical Machining Center. It is supported by the main journals using a precision ground 2-inch bar and tailstock which ensures the datum is the main journals. This method gives us a true reference point to perform all machining operations. A Rennishaw probe is utilized to check that the case is fixtured true, and once confirmed the machining process begins.\u003c\/p\u003e  \u003cp\u003eOnce the case is fixtured, the first step is to mill out 12 pockets for CNC inserts. Rather than attempting to install inserts into an inconsistent cast case, the pockets are milled out to exact dimensions creating a consistent area that accepts our precision inserts. Once the pockets are machined, the case is removed from the mill and placed into a block oven at a low temperature. Our pre-machined closed-deck inserts are simultaneously chilled using dry ice. When the case and inserts have reached our desired temperature, they are moved into our install station, which holds the block and lightly presses the inserts into position on one side of the deck surface. This process is repeated on the other side and then the partially completed case is moved to a cooling rack. In the next step of our process, the case is loaded and fixtured back into the VF-4SS after reaching room temperature. During this stage, the flanges left from machining the inserts are milled close to the case deck surface. Features such as coolant passages and case bolt access positions are machined. Finally, each deck surface is machined true and flat using a Poly Crystal Diamond insert.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eSPECIALLY DESIGNED INSERTS\u003c\/strong\u003e\u003c\/p\u003e  \u003cp\u003eOur machining process converts the semi-open deck to a complete closed deck and features the use of cast insert material that closely matches the metallurgy of the aluminum case material in a factory Subaru EJ engine block. By using a similar cast material (rather than billet), we ensure that during expansion and contraction the materials grow and shrink at similar rates, which is vital for maintaining roundness within the top of the bore. The outer inserts are machined from ¾\" cast material and the inner inserts from 1-inch cast material. Once the deck is surfaced, the result is a true ½ inch finished outer insert thickness and true ¾ inch finished inner insert thickness.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eFINAL BORE AND HONE\u003c\/strong\u003e\u003c\/p\u003e  \u003cp\u003eEvery IAG Closed Deck case must be bored and honed after the closed deck process. During the closed deck process the cylinder walls become slightly distorted and an overbore must be performed to the correct this distortion and prepare the block to accept new pistons. EJ25 Case Halves must use 99.75mm pistons and EJ20 Case Halves must use 92.5mm pistons. \u003c\/p\u003e  \u003cp\u003e \u003c\/p\u003e  \u003cp\u003e \u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eIAG 750 EJ20 Closed Deck Case Includes:\u003c\/strong\u003e\u003c\/p\u003e  \u003cul\u003e \t\u003cli\u003e(x1) IAG 750 Closed Deck Converted Case Halves (Using brand new EJ20 Case \/ Stock Bore 92mm) \u003cstrong\u003e*92.5mm Bore and hone additional and required before final assembly!\u003c\/strong\u003e\n\u003c\/li\u003e \t\u003cli\u003e(x1) Machined for OEM 11mm Head Studs\u003c\/li\u003e \u003c\/ul\u003e  \u003cp\u003e \u003c\/p\u003e  \u003cp\u003e \u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eVehicle Fitment:\u003c\/strong\u003e\u003c\/p\u003e  \u003cul\u003e \t\u003cli\u003e1999-2005 Subaru WRX (EJ20)\u003c\/li\u003e \t\u003cli\u003e1999-2005 Subaru STI (EJ20)\u003c\/li\u003e \t\u003cli\u003e1997-2002 Subaru Forester XT (EJ20)\u003c\/li\u003e \t\u003cli\u003e1998-2006 Subaru Liberty GT (EJ20)\u003c\/li\u003e \t\u003cli\u003e1998-2006 Subaru Outback XT (EJ20)\u003c\/li\u003e \u003c\/ul\u003e","brand":"IAG Performance","offers":[{"title":"Default Title","offer_id":67903047958848,"sku":"IAG-ENG-C755","price":5589.95,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0985\/1152\/0064\/files\/IAG-ENG-C755.jpg?v=1793264390"},{"product_id":"roger-clark-motorsport-high-performance-11mm-head-stud-kit-rcm1635","title":"Roger Clark Motorsport High Performance 11mm Head Stud Kit RCM1635","description":"\u003ca href=\"https:\/\/www.prospeedracing.com.au\/products\/roger-clark-motorsport-rcm-high-performance-11mm-head-stud-kit.html\" style=\"text-decoration:none\"\u003e \u003c\/a\u003e\u003cp\u003eThe RCM 11mm Performance Head Stud Kit is highly recommended for any new or rebuilt engine producing up to or around 350bhp.\u003c\/p\u003e  \u003cp\u003eManufactured from S99 Steel with a certified minimum yield strength of 1080 MPa our new Performance Studs offer a substantialy greater force on your cylinder head gaskets when compared to the O.E cylinder head bolts. With a greater pressure placed on your cylinder heads (and in turn your cylinder head gaskets) this greatly reduces the chance of head movement under boost, keeping your precious head gaskets stable and allowing them to continue providing an effective seal from cylinder chambers, oil and waterways.\u003c\/p\u003e \u003ca href=\"https:\/\/www.prospeedracing.com.au\/products\/roger-clark-motorsport-rcm-high-performance-11mm-head-stud-kit.html\" style=\"text-decoration:none\"\u003e \u003c\/a\u003e","brand":"Roger Clark Motorsport (RCM)","offers":[{"title":"Default Title","offer_id":67903056773440,"sku":"RCM1635","price":773.95,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0985\/1152\/0064\/files\/RCM1635_350dfe8d-7a3d-4ea5-91b6-5fe9f0658db7.jpg?v=1793264484"},{"product_id":"arp-main-stud-kit-203-5405","title":"ARP Main Stud Kit 203-5405","description":"\u003cp\u003eThere are many important reasons to use ARP main stud kits, including the elimination of main cap walk and fretting, as well as protecting the threads in your engine block. All kits come complete with hardened parallel-ground washers and high quality nuts. Some applications have provisions for mounting windage trays and have specially designed standoff studs with serrated lock nuts to position the windage tray and lock it securely in place. The studs are manufactured from 8740 chrome moly steel, heat-treated in-house to 200,000 psi tensile strength, and precision J-form threads rolled after heat-treat to create a fastener that has threads 1000% stronger than others.\u003c\/p\u003e","brand":"ARP","offers":[{"title":"Default Title","offer_id":67904769917248,"sku":"203-5405","price":376.95,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0985\/1152\/0064\/files\/203-5405.jpg?v=1793278372"},{"product_id":"arp-main-stud-kit-207-5403","title":"ARP Main Stud Kit 207-5403","description":"\u003cp\u003eThere are many important reasons to use ARP main stud kits, including the elimination of main cap walk and fretting, as well as protecting the threads in your engine block. All kits come complete with hardened parallel-ground washers and high quality nuts. Some applications have provisions for mounting windage trays and have specially designed standoff studs with serrated lock nuts to position the windage tray and lock it securely in place. The studs are manufactured from 8740 chrome moly steel, heat-treated in-house to 200,000 psi tensile strength, and precision J-form threads rolled after heat-treat to create a fastener that has threads 1000% stronger than others.\u003c\/p\u003e","brand":"ARP","offers":[{"title":"Default Title","offer_id":67904769950016,"sku":"207-5403","price":548.95,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0985\/1152\/0064\/files\/207-5403.jpg?v=1793278372"},{"product_id":"iag-performance-14mm-head-stud-dowel-single-iag-eng-1712","title":"IAG Performance 14mm Head Stud Dowel SINGLE IAG-ENG-1712","description":"\u003ca href=\"https:\/\/www.prospeedracing.com.au\/IAG-Performance-14mm-Head-Stud-Dowel-SINGLE-Subaru-WRX-STI-FXT-LGT-EJ20-EJ25-IAG-ENG-1712\" style=\"text-decoration:none\"\u003e \u003c\/a\u003e\u003cp\u003eThe IAG Performance 14mm Head Stud Dowel is specifically designed to work our 14mm ARP head studs and machined cases. Subaru short blocks or cases that are machined for 14mm head studs will require (x2) dowels per side or (x4) dowels total. Dowels are sold individually.\u003c\/p\u003e \u003ca href=\"https:\/\/www.prospeedracing.com.au\/IAG-Performance-14mm-Head-Stud-Dowel-SINGLE-Subaru-WRX-STI-FXT-LGT-EJ20-EJ25-IAG-ENG-1712\" style=\"text-decoration:none\"\u003e \u003c\/a\u003e","brand":"IAG Performance","offers":[{"title":"Default Title","offer_id":67905032094016,"sku":"IAG-ENG-1712","price":32.95,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0985\/1152\/0064\/files\/IAG-ENG-1712.jpg?v=1793279549"},{"product_id":"iag-replacement-arp-14mm-head-stud-washer-single-iag-rpl-1711-sw","title":"IAG Replacement ARP 14mm Head Stud Washer - SINGLE IAG-RPL-1711-SW","description":"\u003cp\u003eThe IAG ARP 14mm Head Stud Washer is intended to directly replace (1) of the washers included with our 14mm Head Stud Set with part number: IAG-ENG-1711. The washers are sold individually, (x12) are required for (1) engine or (x6) per cylinder head. \u003c\/p\u003e","brand":"IAG Performance","offers":[{"title":"Default Title","offer_id":67905041957184,"sku":"IAG-RPL-1711-SW","price":21.95,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0985\/1152\/0064\/files\/apitsdxpt__41160.jpg?v=1793279577"}],"url":"https:\/\/shop.vctrperformance.com\/collections\/head-stud.oembed","provider":"VCTR","version":"1.0","type":"link"}