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ARP Subaru EJ 2.0/2.5L DOHC CA625+ Head Stud Kit

ARP

Item #:

  • $60049

Estimated Arrival: Between Dec 09 and Dec 16. * ETA for US orders only. If quantities are low or are SPECIAL ORDER, please call to ensure stock and availability.

Shipping & Returns: Free Shipping on orders over $100. Fees may apply on Returns. Please check out our shipping page for more information. Learn More.

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ARP Subaru EJ 2.0/2.5L DOHC CA625+ Head Stud Kit

  • 2004-2006 Subaru Baja Turbo H4.2458cc
  • 2008 Subaru Forester Sports 2.5 XT H4.2458cc
  • 2004-2005 Subaru Forester XT H4.2458cc
  • 2009 Subaru Forester XT H4.2458cc
  • 2006-2010 Subaru Forester XT Limited H4.2458cc
  • 2005 Subaru Forester XT Premium H4.2458cc
  • 2010-2012 Subaru Forester XT Premium H4.2458cc
  • 2011-2012 Subaru Forester XT Touring H4.2458cc
  • 1998 Subaru Impreza RS H4.2458cc
  • 2002-2005 Subaru Impreza WRX H4.1994cc
  • 2010-2011 Subaru Legacy 2.5GT H4.2458cc
  • 1999 Subaru Legacy GT H4.2458cc
  • 2005-2006 Subaru Legacy GT H4.2458cc
  • 2005 Subaru Legacy GT Limited H4.2458cc
  • 2007-2009 Subaru Legacy GT Limited H4.2458cc
  • 2006-2009 Subaru Legacy GT spec.B H4.2458cc
  • 2005-2006 Subaru Outback XT H4.2458cc
  • 2005-2009 Subaru Outback XT Limited H4.2458cc

It is for good reason that virtually every top professional engine builder relies on ARP Pro Series head studs for their all-out competition powerplants. Simply stated, thereΓÇÖs not a better stud setup on the market today.

For openers, ARP uses a premium grade 8740 alloy that is rated far superior to ΓÇ£aircraftΓÇ¥ quality. Each stud is placed vertically in special racks and precisely heat-treated to 200,000 psi. 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. ItΓÇÖs 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 wonΓÇÖt happen with inferior quality head studs.

ARP studs are thread rolled after heat-treat, which gives them about 1000% (thatΓÇÖs 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 itΓÇÖs 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 ΓÇ£stretchΓÇ¥ 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!

Premium quality heat-treated 8740 chrome moly steel head stud kits are available for most every domestic and import applications.

You wonΓÇÖt find a better quality stud on the market from any other source. Look for ARP stamped on each stud as your assurance of quality.

Clearly, ARP Head Stud/Bolt Kits are the best on the market today, and the favorite of leading professional engine builders in all forms of racing.

HIGH PERFORMANCE SERIES
High Performance head bolts are available with a reduced wrenching hex or 12-point and wide area flanged head that eliminates the need for valve train removal to facilitate cylinder head retorquing. All High Performance Series bolts are 180,000 psi (which is 15% stronger than Grade 8) and kits come complete with hardened parallel-ground washers.

PRO SERIES
All Pro Series bolts are cold-forged to ensure molecular integrity, heat-treated prior to thread rolling and machining, and are rated nominally at 200,000 psi. ARP Pro Series head bolt kits are application specific - designed for use with typically competition only components. These fasteners deliver superior strength and meet the ARP ΓÇ£ZERO defect - ZERO failureΓÇ¥ quality standard. Hardened and parallel-ground washers are included with each kit to ensure even load distribution and accurate torque readings. All Pro Series head bolts have a reduced wrenching hex or 12-point head and wide area flange to eliminate the need for valve train removal for cylinder head retorquing and permits the use of larger diameter valve springs. Most applications have undercut short bolts that can help eliminate head gasket failures through providing more ΓÇ£stretchΓÇ¥ to compensate for the additional compression of gaskets.


Head Studs vs Bolts
On many street-driven vehicles, where master cylinders and other items protrude into the engine compartment, itΓÇÖs probably necessary to use head bolts so that the cylinder heads can be removed with the engine in the car.

For most applications, however, studs are recommended. And for good reason. Using studs will make it much easier to assemble an engine (especially a racing powerplant which must be serviced frequently and quickly!) with the cylinder head and gasket assured of proper alignment.

Studs also provide more accurate and consistent torque loading. HereΓÇÖs why. When you use bolts to secure the head, the fastener is actually being ΓÇ£twistedΓÇ¥ while itΓÇÖs being torqued to the proper reading. Accordingly, the bolt is reacting to two different forces simultaneously. A stud should be installed in a ΓÇ£relaxedΓÇ¥ mode - never crank it in tightly using a jammed nut.

If everything is right, the stud should be installed finger tight. Then, when applying torque to the nut, the stud will stretch only on the vertical axis. Remember, an undercut shorter stud will have a rate similar to a longer, standard shank stud. This provides a more even clamping force on the head. Because the head gasket will compress upon initial torquing, make sure studs and bolts are re-torqued after the engine has been run.

Free Shipping on Orders Over $100*

*Free Shipping is valid on most orders $100 and over that ship via ground service within the contiguous United States only. Orders $0 - $24.99 will incur a $6.99 shipping fee, and orders $25 - $99.99 will incur a $9.99 shipping fee. Most items will deliver 2 days after order has been processed, however...

  • Additional delivery days may apply to hazardous items, wheels, oversized items, truck freight items, and select zip codes or remote delivery areas as determined by carrier.

Order Confirmation:

As soon as you place your order, you will receive an order confirmation e-mail. This means that we have received your order in our system and pre-authorized your credit card for the purchase. As soon as we receive your order, we automatically reach out to our suppliers to confirm that it is in stock and available for immediate shipment. If your item is on backorder or unavailable, we will void the pre-authorization and reach out to you via e-mail. If your item(s) are available for immediate shipment (within 5 business days), we will process the charges and submit the order for shipment. Please allow up to 2 business days to process your order - Thank you

Order Shipment:

If your order is in stock and we process the charges to your credit card, it will ship within five business days from the date of your order. We will send you tracking information within 24 hours of your order leaving the warehouse to the e-mail address you provided when checking out. If you do not receive tracking information from us within six business days of your order, feel free to follow up with us at orders@imaginemotorsports.com

Damages:

Please inspect the packaging of your item(s) when they arrive, if you notice any damage you should make note of it when signing for delivery. If your item(s) do arrived damaged, please send photos to returns@imaginemotorsports.com and we will process an insurance claim on your behalf.

Cancellations & Refunds:

All orders cancelled after 48 hours are subject to a $20 administration fee, whether or not your order has shipped. If you order has shipped, you (the buyer) will also be responsible for actual return shipping charges. Refunds will only be issued to the original credit card that you use when placing your order, minus a $20 restocking fee as well as any shipping charges we incurred if you selected free shipping.

We ship via:

We work very hard to ensure that we offer the absolute best prices online.  If you find another online store that offers a lower price then us within six months of your purchase date please let us know and we will refund your original payment for the difference.  We want you to feel confident that you are getting the absolute best price for the product you are ordering.  If you find that our own website has a lower price for the same item you have ordered within six months of your purchase date will refund the difference as well.

To request your partial refund simply e-mail us a link to the same product on our website, or on our competitors website within six months from the date of your order and we will process the credit accordingly.

Our 100% Price Guarantee has some limitations:

  • You must purchase the item from our website before requesting your Price Match Guarantee
  • Promotions such as rebates and buy one, get one free offers are not eligible
  • The item must be in stock on the competitors website
  • The competitor must be an online store, they may not have a retail location
  • The website can not be a discounter or auction website (ie; eBay, overstock, etc..)
  • The competitor must be an Authorized Retailer of the product in question
  • The Price Match Guarantee includes the item price only, it excludes sales tax

ARP Subaru EJ 2.0/2.5L DOHC CA625+ Head Stud Kit

  • 2004-2006 Subaru Baja Turbo H4.2458cc
  • 2008 Subaru Forester Sports 2.5 XT H4.2458cc
  • 2004-2005 Subaru Forester XT H4.2458cc
  • 2009 Subaru Forester XT H4.2458cc
  • 2006-2010 Subaru Forester XT Limited H4.2458cc
  • 2005 Subaru Forester XT Premium H4.2458cc
  • 2010-2012 Subaru Forester XT Premium H4.2458cc
  • 2011-2012 Subaru Forester XT Touring H4.2458cc
  • 1998 Subaru Impreza RS H4.2458cc
  • 2002-2005 Subaru Impreza WRX H4.1994cc
  • 2010-2011 Subaru Legacy 2.5GT H4.2458cc
  • 1999 Subaru Legacy GT H4.2458cc
  • 2005-2006 Subaru Legacy GT H4.2458cc
  • 2005 Subaru Legacy GT Limited H4.2458cc
  • 2007-2009 Subaru Legacy GT Limited H4.2458cc
  • 2006-2009 Subaru Legacy GT spec.B H4.2458cc
  • 2005-2006 Subaru Outback XT H4.2458cc
  • 2005-2009 Subaru Outback XT Limited H4.2458cc

It is for good reason that virtually every top professional engine builder relies on ARP Pro Series head studs for their all-out competition powerplants. Simply stated, thereΓÇÖs not a better stud setup on the market today.

For openers, ARP uses a premium grade 8740 alloy that is rated far superior to ΓÇ£aircraftΓÇ¥ quality. Each stud is placed vertically in special racks and precisely heat-treated to 200,000 psi. 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. ItΓÇÖs 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 wonΓÇÖt happen with inferior quality head studs.

ARP studs are thread rolled after heat-treat, which gives them about 1000% (thatΓÇÖs 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 itΓÇÖs 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 ΓÇ£stretchΓÇ¥ 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!

Premium quality heat-treated 8740 chrome moly steel head stud kits are available for most every domestic and import applications.

You wonΓÇÖt find a better quality stud on the market from any other source. Look for ARP stamped on each stud as your assurance of quality.

Clearly, ARP Head Stud/Bolt Kits are the best on the market today, and the favorite of leading professional engine builders in all forms of racing.

HIGH PERFORMANCE SERIES
High Performance head bolts are available with a reduced wrenching hex or 12-point and wide area flanged head that eliminates the need for valve train removal to facilitate cylinder head retorquing. All High Performance Series bolts are 180,000 psi (which is 15% stronger than Grade 8) and kits come complete with hardened parallel-ground washers.

PRO SERIES
All Pro Series bolts are cold-forged to ensure molecular integrity, heat-treated prior to thread rolling and machining, and are rated nominally at 200,000 psi. ARP Pro Series head bolt kits are application specific - designed for use with typically competition only components. These fasteners deliver superior strength and meet the ARP ΓÇ£ZERO defect - ZERO failureΓÇ¥ quality standard. Hardened and parallel-ground washers are included with each kit to ensure even load distribution and accurate torque readings. All Pro Series head bolts have a reduced wrenching hex or 12-point head and wide area flange to eliminate the need for valve train removal for cylinder head retorquing and permits the use of larger diameter valve springs. Most applications have undercut short bolts that can help eliminate head gasket failures through providing more ΓÇ£stretchΓÇ¥ to compensate for the additional compression of gaskets.


Head Studs vs Bolts
On many street-driven vehicles, where master cylinders and other items protrude into the engine compartment, itΓÇÖs probably necessary to use head bolts so that the cylinder heads can be removed with the engine in the car.

For most applications, however, studs are recommended. And for good reason. Using studs will make it much easier to assemble an engine (especially a racing powerplant which must be serviced frequently and quickly!) with the cylinder head and gasket assured of proper alignment.

Studs also provide more accurate and consistent torque loading. HereΓÇÖs why. When you use bolts to secure the head, the fastener is actually being ΓÇ£twistedΓÇ¥ while itΓÇÖs being torqued to the proper reading. Accordingly, the bolt is reacting to two different forces simultaneously. A stud should be installed in a ΓÇ£relaxedΓÇ¥ mode - never crank it in tightly using a jammed nut.

If everything is right, the stud should be installed finger tight. Then, when applying torque to the nut, the stud will stretch only on the vertical axis. Remember, an undercut shorter stud will have a rate similar to a longer, standard shank stud. This provides a more even clamping force on the head. Because the head gasket will compress upon initial torquing, make sure studs and bolts are re-torqued after the engine has been run.

Free Shipping on Orders Over $100*

*Free Shipping is valid on most orders $100 and over that ship via ground service within the contiguous United States only. Orders $0 - $24.99 will incur a $6.99 shipping fee, and orders $25 - $99.99 will incur a $9.99 shipping fee. Most items will deliver 2 days after order has been processed, however...

  • Additional delivery days may apply to hazardous items, wheels, oversized items, truck freight items, and select zip codes or remote delivery areas as determined by carrier.

Order Confirmation:

As soon as you place your order, you will receive an order confirmation e-mail. This means that we have received your order in our system and pre-authorized your credit card for the purchase. As soon as we receive your order, we automatically reach out to our suppliers to confirm that it is in stock and available for immediate shipment. If your item is on backorder or unavailable, we will void the pre-authorization and reach out to you via e-mail. If your item(s) are available for immediate shipment (within 5 business days), we will process the charges and submit the order for shipment. Please allow up to 2 business days to process your order - Thank you

Order Shipment:

If your order is in stock and we process the charges to your credit card, it will ship within five business days from the date of your order. We will send you tracking information within 24 hours of your order leaving the warehouse to the e-mail address you provided when checking out. If you do not receive tracking information from us within six business days of your order, feel free to follow up with us at orders@imaginemotorsports.com

Damages:

Please inspect the packaging of your item(s) when they arrive, if you notice any damage you should make note of it when signing for delivery. If your item(s) do arrived damaged, please send photos to returns@imaginemotorsports.com and we will process an insurance claim on your behalf.

Cancellations & Refunds:

All orders cancelled after 48 hours are subject to a $20 administration fee, whether or not your order has shipped. If you order has shipped, you (the buyer) will also be responsible for actual return shipping charges. Refunds will only be issued to the original credit card that you use when placing your order, minus a $20 restocking fee as well as any shipping charges we incurred if you selected free shipping.

We ship via:

We work very hard to ensure that we offer the absolute best prices online.  If you find another online store that offers a lower price then us within six months of your purchase date please let us know and we will refund your original payment for the difference.  We want you to feel confident that you are getting the absolute best price for the product you are ordering.  If you find that our own website has a lower price for the same item you have ordered within six months of your purchase date will refund the difference as well.

To request your partial refund simply e-mail us a link to the same product on our website, or on our competitors website within six months from the date of your order and we will process the credit accordingly.

Our 100% Price Guarantee has some limitations:

  • You must purchase the item from our website before requesting your Price Match Guarantee
  • Promotions such as rebates and buy one, get one free offers are not eligible
  • The item must be in stock on the competitors website
  • The competitor must be an online store, they may not have a retail location
  • The website can not be a discounter or auction website (ie; eBay, overstock, etc..)
  • The competitor must be an Authorized Retailer of the product in question
  • The Price Match Guarantee includes the item price only, it excludes sales tax

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