Ej255 with sti heads You don't need a cnc unless you want crazy boost and timing. 5L DOHC Engines - Xotic Performance™ CP882: Head Bolt Sets - Amazon. LOW and MID RANGE TORQUE! Intake: 22% Increased Flow (max) Exhaust: 41% Increased Flow Originally designed for the North American Impreza STI in 2004 with AVCS and DBW. 0 EJ20 #S20 Turbo DOHC Impreza STi WRX CYLINDER HEADS. Available in standard and oversized. Somewhere in the neighborhood of 8. This block uses the -24cc dish in the piston, which will yield a compression ratio closer to stock for hybrid swaps. RalliSpec EJ25 8. These CNC Ported Heads start with brand new WRX or STI OEM In this episode we install the b25 sti cylinder heads onto our rebuilt ej255 short block. I think it's the same part number between the n/a and turbo cars anyway. Besides that, the version 1 EJ255 is basically just an ARP 12 Point 11mm Cylinder Head Studs For Subaru 2002-14 WRX, 04-21 STI, 05-12 LGT, 04-13 FXT, (EJ20, EJ255, EJ257) This block is paired with IAG Stage 2 Heads that feature brand new Subaru OEM WRX/STI cylinder head castings that are CNC pocket ported to increase flow while maintaining spool. 00. The bare castings are visually inspected then Cosworth CNC Ported Big Valve Cylinder Heads with Camshafts for the 2007 North American Subaru Impreza WRX, STi with the EJ25, 2. Then I'll replace the Buy Subaru Genuine OEM Subaru Head Bolts Kit Impreza WRX STI Forester XT Legacy GT TURBO: Head Bolt Sets - Amazon. I couldn't In this episode we install the b25 sti cylinder heads onto our rebuilt ej255 short block. com FREE DELIVERY possible on Find many great new & used options and get the best deals for OEM Subaru WRX Ej255 08-14 LH Cylinder Head 11063AB250 at the best online prices at eBay! Free shipping for many This IAG 950 fully CNC ported head package starts with brand new WRX STI OEM head castings directly from Subaru of America. Shop now for fast shipping and easy returns! Brian Crower Valves dished head design reduces weight and improves valve control at high RPM on your Subaru WRX/STi. D25 = 50cc, W25 = 57cc. Shop now for fast shipping and easy returns! The combustion chambers are 50cc and the piston dish is 25. just move over you Intake Manifoldyou may ALSO need your 2. The larger size of the head studs Stop-leak is a poor substitute for a properly designed engine and head gasket sealing system. Also, I believe (someone correct me if I am IAG Performance IAG 750 Closed Deck Long Block Engine w/ IAG 750 Heads for 02-14 WRX, 04-21 STI, 04-13 FXT, 05-09 LGT Buy Head Stud Kit for Subaru Impreza WRX STi EJ20 2. In contrast, the EJ257, which powers the high-performance Subaru WRX STI, has a slightly lower compression ratio of Version 6 STI Heads stamped LH C 006 and RH C 007: EJ207 crankshaft differences: 12200AA210 - BE/BH EJ206/EJ208 ----- OEM cross drilled crank 12200AA240 - '06 EJ255. 8. 272 | EJ25 STI AVCS SKU : R-199-C CAMSHAFT ARP Head Studs are stronger than the factory fasteners, and are designed to keep your race engine together under any circumstance. , Resurfaced with the Poly Crystalline This block is paired with IAG Stage 2 Heads that feature brand new Subaru OEM WRX/STI cylinder head castings that are CNC pocket ported to increase flow while maintaining spool. 272 | EJ25 STI AVCS SKU : R-199-C CAMSHAFT A "DROP-IN" SOLUTION The IAG Performance Hand-Built Subaru EJ25 Closed Deck Long Block Engine Packages are a complete, valve cover to valve cover, crate engine. Case / Main Bolts - Standard FHI Subaru case bolts. The bare castings are visually inspected then To anyone running ej20k or ej20g heads on ej255 or ej257 blocks Built Motor Discussion Welcome to the North American Subaru Impreza Owners Club: Thursday STI Regardless, the D25 (wrx) heads have a smaller combustion chamber that increases the compression vs. 00 . 5 #H25 Turbo DOHC EJ25, Impreza STi with single AVCS CYLINDER HEADS. Rebuilt an '08 SOHC a couple years back and 50K miles ago - still going strong Head to block mating should be flat - This IAG 950 fully CNC ported head package starts with brand new WRX STI OEM head castings directly from Subaru of America. FXT/WRX pistons are -24cc dished, STI are -22cc The cylinder head is designed for the Subaru 2. These engines offer significant ease of installation for customers What year Forester sti ej255 engine? Dual AVCS or single? Red intake manifold or black plastic? Subaru likes to just use the same engine across the board. These heads will include GSC valve train Ask about us sending you a sturdy box for shipping us your heads! We have all STI and WRX and FORESTER XT LEGACY GT BAJA ALL SOHC (with and without VVL) and FA20/DIT HEADS in stock ready for custom building or This is a brand new, completely assembled 2. the EJ20 longblock is a common enough swap. AS WELL AS THE ROD BOLT TORQUE!!! For *PLEASE SPECIFY THE YEAR OF YOUR CAR AND MODEL/ENGINE SIZE* The TURBO applications with engine codes EJ255 and EJ257 short blocks fit all these vehicles: 2. 5L DOHC (EJ255) rebuild. AS WELL AS THE ROD BOLT TORQUE!!! For Head gasket failure (1, 2) is said to be related to the open deck construction of new engine blocks which pioneered in the mid'9's by many vendors. Forester, Impreza. 99 STI EJ257 use W25 heads and have a large combustion chamber to lower static compression. Menu. , Resurfaced with the Poly Crystalline Diamond, all the valves are refaced at 45 degree, Fully rebuilt Subaru cylinder head pair. JULY SALE - 10% off ALL TOYOTA G16E-GTS . 2:1 Manley H Beam Rods ACL Bearings EJ25 STI heads ported +1mm valves plus all the related goodies Crower Stage 2 cams 1000cc Explore a wide range of our Ej25 Heads selection. Factory fasteners were not designed for performance use. 2004-2006 STI model used the same shortblock, b25 heads, and valvetrain as EJ255 in MY 2005-2006 Legacy GT and the same block as the 2004-2005 Ask about us sending you a sturdy box for shipping us your heads! We have all STI and WRX and FORESTER XT LEGACY GT BAJA ALL SOHC (with and without VVL) Combustion Chamber matching for the EJ20 to EJ255/257 This IAG 1150 fully CNC ported head package starts with brand new WRX STI OEM head castings directly from Subaru of America. SOLD AS SET. 0L & EJ25 2. An EJ257 short block with D25 heads will have a compression ratio that's actually HIGHER than either a stock EJ255 or EJ257. The key difference in the new EJ255 with the D25 heads is the fact that the D25 heads had a smaller combustion chamber volume To anyone running ej20k or ej20g heads on ej255 or ej257 blocks What route did you take with pistons, rods, headgaskets, etc? How did you come up with your desired Stay tuned for a another project using EJ22T stroker short block and D25 EJ255 heads. If using single AVCS Ej255 D25 casting heads or EJ205 heads the compression ratio will be 9. The IAG 550 long block features our highly popular IAG 550 Short 2008+ subaru wrx came with the ej255 2. Increased Port Size at Cylinder Heads Allow Matching to Larger Hand Ported or CNC Ported Cylinder Heads; Throttle Body Opening Accepts Larger Throttle Bodies up to 2. 5L STi headgasket is multi-layered steel. Parts Experts; Fast rods and pistons only. This is more of a how to video on how these heads are installed. WE NEED TO BUILD YOUR HEADS. 5 Liter EJ255 short-block directly from Subaru. ENTRY-LEVEL STOCK REPLACEMENT HEADS. The IAG 550 long block features our highly popular IAG 550 Short The block is then paired up with our IAG 550 Cylinder Head Package which features Subaru WRX STI OEM cylinder head castings and GSC valvetrain components. "Racing" rod and crank We worked closely with our machine shop to actually map out the combustion chamber of the EJ257 STI head and create a CNC program to replicate the exact same The EJ205 heads flow a little less and will raise the compression slightly compared to the EJ255 heads. Massive selection from top brands on eBay. Then, each stud is placed vertically in special racks Okay so, this is my 1st '04 2. 4:1. , Resurfaced with the Poly BC0620 - Subaru EJ257/EJ255 Stage 2+ Camshafts. 5L head gaskets and IAG 550 STREET CYLINDER HEADS PACKAGE FOR 02-14 WRX, 04-21 STI, 05-09 LGT, 04-13 FXT. This is a complete remanufactured pair of 2008-2018 Subaru Turbo 2. 32 $ 301,668. 99 Pay in full or in 4 interest-free installments of $825. 2002-2014 Subaru WRX / 2004-2021 STI / 2005-2009 Legacy GT / 2004-2013 Forester XT) $3,299. Honda does have some of the best flowing heads for what they are. The bare castings are visually inspected then EJ 25 Turbo long block 2004-14 (Except 08-UP STI). com FREE DELIVERY Mizumo Auto MA-9761233098 Timing Belt Kit AISIN Water The EJ257 is an STI motor EJ255 is a outback XT motor, both using the semi closed deck, and are turbocharged. either find a refurbished/used complete The cylinder head is designed for the Subaru 2. I know that newer EJ25 motors use D25 heads. EJ255 heads or EJ257 heads? If you can get late 04 or 05 heads they have the same size valves as the sti The EJ255 shares a lot of mechanical components with the EJ257 (which is discussed below). 5L Fitments: 2002-2014 WRX 2004-2019 STi 2005-2012 STAGE 5 HEADS: Brand new Subaru OEM WRX/STI cylinder head casings; CNC ported intake and exhaust runners; Intake Valves: Ferrea 37mm (+1mm) Comp Plus Intake Valves; Exhaust Valves: Ferrea 33mm (+1mm) Comp Plus EJ255. It will tune This IAG 1150 fully CNC ported head package starts with brand new WRX STI OEM head castings directly from Subaru of America. 5 turbo engine, while this is a great engine it has its shortcomings it only has variable valve timing on one side, its prone to braking pistons and has connecting rod wear, not only that I've just changed from V25B heads which were on the EJ257 STI to D25 heads that were on the EJ255 WRX without issue. also you can just use D or B head exhaust cams instead of modifying the Salutations! Have a 04 sti. This will give you stronger crank, rods and dished pistons for 9. Designed for Intense. Fits Forester, Impreza, WRX Cylinder Head Right. sold as set. turbo, sti only 2008-2019. We have all the parts you need for your Subaru such as home » impreza/wrx/sti » 2011-2014 » 2006-2014 subaru wrx single avcs d25 cylinder heads set lh/rh oem ej255. 5L) IAG's / ARP 14mm Head Stud Set is designed for use on high horsepower EJ25 Subaru engines. Version 2, Things in common include the engine block, heads, and based on some of the research done by a couple of the reputable members on NASIOC, the 257 pistons combined with the 255's D25 heads would bump up your ARP Head Studs are stronger than the factory fasteners, EJ255, EJ257, EJ257B: Brand: ARP: Fastener Type: Stud: Fastener Material: ARP2000: Carb Legal: Unspecified: Shipping Label: Free Shipping: Reviews . These heads will include GSC valve train Repairing an engine failure? Building an engine from scratch with your own internals and valvetrain? This is a great option for you, since Subaru no longer offers fully assembled heads as a single part number. Welcome to the North American Subaru Impreza Owners Club: Friday January 24, 2025: Hi, Do some more searching. Think of it like putting a built stroker kit in a small block V8. Head Studs: Make: Subaru: Model: STI STI Heads - 4x Lost cam caps and 1x damaged AVCS Bracket / font cam cap: dexterous: Built Motor Discussion: 18: 07-11-2010 06:45 PM: wtb sti oem head studs, main bolts Use the ej255 SB -- the pistons in the 257 will bump your compression ratio up, requiring the use of a thicker cometic HG to bring it back down. Skip to the beginning of the images gallery. This is a turbo engine and was often fitted with super cool sodium filled valves. 2004-2006 STI model used the same shortblock, b25 heads, and valvetrain as EJ255 in MY 2005-2006 We have all STI and WRX and FORESTER XT LEGACY GT BAJA ALL SOHC (with and without VVL) and FA20/DIT HEADS in stock ready for custom building or stock. 0. The larger stud size increases its load capacity which in turn helps to prevent the cylinder IAG 550 STREET CYLINDER HEADS PACKAGE FOR 02-14 WRX, 04-21 STI, 05-09 LGT, 04-13 FXT. The OEM EJ25 gaskets have been shown to hold up under extensive boost pressures and high temperatures. 7mm Material Inconel Valve Type Exhaust / Dished $ 262. ARP head studs for your Subaru WRX and STI ARP uses a premium grade 8740 alloy that is rated far superior to "aircraft" quality. 5L Turbo Powertrain (EJ Series Factory 2. Cosworth cylinder heads: Subaru WRX STi EJ25 2004-06 This is a complete remanufactured pair of 2002 - 2006 Subaru 2. 99 at Subimods. However the technology was Installation requires cylinder head modification and use of shimless buckets. What rods and pistons do you have? WRXLESS1 likes Big Valve / Super Hot Cam STi . Head Dia 32mm Stem Dia 5. All models. subaru cylinder heads go through a Subaru MLS Head Gasket thicknesses & Other Questions Built Motor Discussion. Engine comes with New Oem Phasers. If you are looking for a IAG's 1150 CNC Ported Drag cylinder heads are intended drag racing and supporting the highest possible horsepower. . Considering I'm looking to pick up either a 255 or a 257 to fully build it (top and bottom), I ask We Have Genuine OEM Subaru Cylinder Heads At Wholesale Prices! Don't Buy Local When You Can Save Big Online. I'll keep putting it in until the vapor becomes visible again. The turbo or STI rods differ from the na rods in small end taper and length. 2006-2014 WRX, Legacy GT, Outback XT, Forester XT casting D25. In contrast, the EJ257, which powers the high-performance Subaru WRX STI, has a slightly lower compression ratio of Valve lifts are measured with STi cams fitted and rotated for measurement. The bare castings are visually inspected then 2006 Subaru Impreza WRX STI EJ25Today after some cleaning we start installing the valve seals on the cylinder heads and proceed to install valves and camsha 1) the right sized head gasket and that depends on what compression you plan on running (STi/OEM, Cosmetic, Cosworth). Explore a wide range of our Ej25 Heads selection. The EJ255 heads were the AB650-code, while the STI used AB640/910-code heads, better known as the B25 heads. IAG Performance carries Cylinder Heads and Head Parts for your 2002-2023 Subaru WRX, STI, Legacy GT, Forester XT, and BRZ. Stay tuned for a another project using EJ22T stroker short block and D25 This is a complete remanufactured pair of 2006-2014 Subaru Turbo 2. [17] EJ255 Version 2: Used in the 2006–2014 WRX, the 2007–2009 Legacy GT, and the 2006–13 Forester Originally designed for the North American Impreza STI in 2004 with AVCS and DBW. They all use this similar shape. 5:1 on D Cylinder Heads (EJ255) 8. Add To List. 2CR Long Block SS V25B Heads: I'm planning on putting on one of the new Subaru Type RA blocks, my question is, will the stock Ej255 LGT heads bolt right up to the EJ257 STI block? and if so, do I get the Newer ej25s, like 09+ have different passages in the heads so you need to use the 07+ sti gaskets. Besides that, the version 1 EJ255 is basically just an Starting this build thread for everybody that is looking to swap their engine with one from a GR gen STI. Dial gauge was measured at an angle so actual lift points are actually a tad shorter than what they What heads would it be better to run on a built EJ255 shortblock. You will need to Buy IAG Performance 950 Series EJ25 Long Block w/ IAG 950 Heads 2002-2014 WRX / 2004-2021 STI / 2004-2013 Forester XT / 2005-2009 Legacy GT, a Long Blocks by IAG Performance, for only $12,999. The IAG 550 Cylinder Heads are designed to function as an entry-level 1) the right sized head gasket and that depends on what compression you plan on running (STi/OEM, Cosmetic, Cosworth). com! Long block package assembled from RalliSpec's Street Spec Standard short block (RSB-SS25) and Stage 0 cylinder head package. These CNC Pocket Ported Heads start with brand new WRX STI OEM head castings, Shop Cylinder Heads for 2020 Subaru WRX STI with eBay Guaranteed Fit. , Resurfaced with the Poly Crystalline Diamond, all the valves are refaced at 45 degree, seats grinded Buy IAG Performance 750 Series EJ25 Long Block w/ IAG 750 Heads 2002-2014 WRX / 2004-2021 STI / 2004-2013 Forester XT / 2005-2009 Legacy GT, a Long Blocks by IAG Performance, for only $11,799. Some performance mods will be done to reach B25 heads vs D25 heads vs W25 heads Built Motor Discussion My 2005 EJ255 came originally with B25 heads. com I understand the 255 and 257 short blocks are the same with the heads changing. 5 DOHC #W25 Impreza STi WRX EJ25 CYLINDER HEADS. The 2019 revision Part #: 11044AA770 The OEM Subaru EJ255 2. The . The B25 ej255 has the same 56cc combustion chambers and 22cc piston dish as the STI. Find top brands, exclusive offers, and unbeatable prices on eBay. DOHC Cylinder Head Package. 5 DOHC #B25 Impreza STi WRX EJ25 CYLINDER HEADS. Share. The EJ255 shortblock is basically identical to the STI shortblock except the WRX/255 pistons have a Cosworth cylinder heads: Subaru WRX STi EJ25 2004-06 KK3670; Skip to the end of the images gallery. Fast shipping. To complete the This is a complete remanufactured pair of 2004 - 2006 Subaru Turbo 2. Head Gasket Required: *IAG Fire-Lock™ . Piston compression height was designed for stock thickness head gaskets. What rods and pistons do you have? WRXLESS1 likes EJ207 heads are better than EJ205 heads. Write Your Own IAG Performance 1/2" Head Stud Set is manufactured by ARP and is designed for use on high horsepower Subaru EJ25, FA20, and FA20 DIT engines. 5cc on the D25 ej255. ARP Custom Age 625+ Head Stud Kit For 2002-14 Subaru WRX, 04-21 STI, 05-12 LGT, 04-13 FXT, (EJ20, EJ255, EJ257) ARP Head Stud Set includes: (x12) Custom Age 625+ head studs (x12) Parallel ground washers (x12) 8740 Installation requires cylinder head modification and use of shimless buckets. Like say when I used sti headgaskets and just cleaned up my heads. 051″ Head Gaskets with IAG-Spec Alloy EJ25 STI new OEM Block CP Pistons 8. 5:1 compression. 5 DOHC #D25 Impreza STi WRX EJ25 CYLINDER HEADS. 2002-2014 WRX, 07-09 Legacy GT/Outback XT, For this reason, we build all of our EJ20’s as a hybrid setup: Using the EJ20 cylinder heads on an EJ25 short This is a complete remanufactured pair of 2008-2018 Subaru Turbo 2. im not going w/ej255 heads putting ej205 heads 09-13 We worked closely with our machine shop to actually map out the combustion chamber of the EJ257 STI head and create a CNC program to replicate the exact same Buy STi 10103AC890 STi Short Block EJ257 (WRX 06-14/STi 06-20). We We have been selling ej255 long blocks for quite some time and every so often we'd get a customer that was hell bent that the ej257 was that much better (cams mainly). Customer core rebuild or call for availibilty of cores. Engine Cylinder Head. The EJ255 has a different domed piston vs fully rebuilt subaru cylinder head pair. 96mm Overall Length 104. 625” EJ255 Cylinder Head Torque Specs Factory 2. EJ257 pistons hitting head as I manually turn the crank: WRXLESS1: Mechanicals: 30: 21-01-2016 01:18 PM: Head gasket 02sti ej207 engine with version 6 sti heads: WhiteRX: Standard new Subaru Nitride Treated 2017+ STI crankshaft; Standard FHI Subaru case bolts/main bolts; Machined to accept 14mm head studs (head studs sold separately) Requires IAG Fire-Lock Head Gaskets; Rated to 1000 HP EJ255 and EJ20 Hybrid options. custom build. 5L WRX and EJ257 2. , Resurfaced with the Poly Crystalline Diamond, all the valves are refaced at 45 degree, 2006 Subaru Impreza WRX STI EJ25Today after some cleaning we start installing the valve seals on the cylinder heads and proceed to install valves and camsha Find many great new & used options and get the best deals for OEM Subaru WRX Ej255 08-14 LH Cylinder Head 11063AB250 at the best online prices at eBay! Free shipping for many Go with OEM block parts for an STI, (257). The EJ257 engine is from a 2012 STI with 60k miles. 5's cam/crank sprockets - Crankshaft - Standard New Subaru Nitride Treated 2017+ STI Crankshaft. )-Virtually identical engine to USDM STI-Single AVCS like USDM STI-Optional Gruppe-S crank sensor adapter The 2004 – 2007 STI models used the same block, valvetrain, and B25 heads as the EJ255 in the model year 2005 – 2006 Legacy GT and the same engine block as the 2004 – 2005 Forester XT. 2. 2) Shims will have to be The EJ257 is an STI motor EJ255 is a outback XT motor, both using the semi closed deck, and are turbocharged. The donor car is 2009 Forester XT with 123k miles and an We sell brand new aftermarket EJ257 SINGLE AVCS Cylinder Heads that you can purchase out-right or buy with a package. 7:1. Shop Now Pay later! Skip to main content. Subaru Long Block Turbo DOHC (2. com > Technical > Head gasket 02sti ej207 engine The EJ255 engine, commonly found in the Subaru Forester XT and the Legacy GT, has a compression ratio of 8. From 2007 these had improve cylinder heads and better optimized Dual AVCS. In the following years, EJ255 The JDM BIG PORT heads have the same design as the B16 head. w/ turbo. See our available This is a result of different pistons as well as differences in the EJ255 heads. Not The IAG 550 package is ideal for clients looking for a long block engine package to support up to 550 BHP applications. STI heads. 2:1 on B, V and W EJ257 Heads with standard thickness gasket. , Resurfaced with the Poly Crystalline Diamond, all the valves are refaced at 45 degree, Given the sticky head gasket selection chart doesn't cover a circa 2009 model EJ255 semi closed block can anyone CONFIRM the original gasket thickness? Perth-WRX. IAG 750 CNC Pocket Ported Cylinder Heads: Heads - Brand EJ255 forged internals build. 2) Shims will have to be I've just changed from V25B heads which were on the EJ257 STI to D25 heads that were on the EJ255 WRX without issue. Not the same exact shortblock as EJ255. Additional Options Available: Head Studs Originally equipped on the 2008-21 I took my weekend to compile a quick guide on converting your JDM EJ20X/Y into a bolt-in replacement for your tired old EJ255. The IAG 550 Cylinder Heads are designed to function as an entry-level IAG 550 Street Cylinder Heads Package - S20 Heads (No Cams & Lifters / No Chamber Mods) - Subaru Models (Inc. CUSTOM BUILD. They come bare for $500 EACH HEAD *To Purchase both side heads, select one side and add to cart, then go Originally designed for the North American Impreza STI in 2004 with AVCS and DBW. The pistons I will be using are STi spec units and from what I've read, using the EJ257 short block The EJ255 heads were the AB650-code, while the STI used AB640/910-code heads, better known as the B25 heads. 5L Crankshaft - Standard New Subaru Nitride Treated 2017+ STI Crankshaft. 2006-2014 subaru wrx single avcs d25 cylinder heads set lh/rh oem ej255 We are now able to offer heads for the 2015-21 STI with OEM Valves, Springs, and Retainers installed, all assembled by Subaru! The camshafts, valve covers, and buckets are not included with these heads, just what you see in these The IAG 550 package is ideal for clients looking for a long block engine package to support up to 550 BHP applications. 5 DOHC Turbocharged F-4 (150 CI); 16 valve; AVCS engine and is compatible with the WRX STI EJ255 / EJ257 Legacy 04-06 EJ255 [with EJ20 Cylinder Heads] EJ257 [with EJ20 Cylinder Heads] WARNING : Operating, servicing and maintaining a passenger vehicle or off-road vehicle can expose you to chemicals including engine exhaust, carbon monoxide, The combustion chambers are 50cc and the piston dish is 25. Great deals. Not true, If I had the cash to do any major upgrades right now I would get a Version 7 RA head and ECU, the twin scroll exhaust from the Version 8 JDM STi, the PE1825F twin scroll IAG's 750 cylinder heads are intended for those looking for a weekend track vehicle combination. we need to build your heads. 5 liter motor are designed for high performance ARP Custom Age 625+ Head Stud Kit For 2002-14 Subaru WRX, 04-21 STI, 05-12 LGT, 04-13 FXT, (EJ20, EJ255, EJ257) ARP Head Stud Set includes: (x12) Custom Age 625+ head studs (x12) Parallel ground washers (x12) 8740 The EJ255 engine, commonly found in the Subaru Forester XT and the Legacy GT, has a compression ratio of 8. Dial gauge was measured at an angle so actual lift points are actually a tad EJ255 Heads on EJ257 Short Block: kpluiten: Built Motor Discussion: 7: 04-14-2018 12:29 AM: EJ207 heads on EJ257 Block what kind of numbers? ellissti6: Built Motor -Semi complete long block (no injectors, power steering, etc. 5l ej257 w25 dual avcs. 5L IAG 950 LONG BLOCK ENGINE WITH IAG 950 HEADS FOR 02-14 WRX, 04-21 STI, 04-13 FXT, 05-09 LGT { "__shgImageElements": { "uuid": "s-2c77a939-aba7-44f6-8418 I believe your '06 XT's EJ255 has D25 heads. IAG 750 CNC Pocket Ported Cylinder Heads: Heads - Brand based on some of the research done by a couple of the reputable members on NASIOC, the 257 pistons combined with the 255's D25 heads would bump up your Standard new Subaru Nitride Treated 2017+ STI crankshaft; Standard FHI Subaru case bolts/main bolts; Machined to accept 14mm head studs (head studs sold separately) Requires IAG Fire-Lock Head Gaskets; Rated to 1000 HP IAG 550 Street Cylinder Heads Package - N25 Heads (No Cams & Lifters / No Chamber Mods) - 2018-2019 Subaru STI Type RA / 2019-2021 STI $3,299. This engine uses the same short block and heads as the EJ257 in US 04–06 STI. com! Head Studs: IAG / ARP 14mm Head Studs, nuts, and washers - *14mm head studs are required for this block; Machining Deck: Machine head gasket deck surface; Minimum Requirements This is a complete remanufactured pair of Subaru 2. Valve lifts are measured with STi cams fitted and rotated for measurement. Subaru 2. Though the block was The goal is to have the full 305 hp from the sti setup but also put forged rods, non forged racing pistons, heavy duty head studs and head gasket. 5 DOHC Turbocharged F-4 (150 CI); 16 valve; AVCS engine and is compatible with the WRX STI EJ255 / EJ257 Legacy 04-06 The donor car is 2009 Forester XT with 123k miles and an overheated EJ255. STI EJ257 use W25 heads and have a large combustion chamber to lower static compression. 5L Turbo) Welcome to the North American Subaru Impreza Owners Club: Sunday Part #: 11044AA770 The OEM Subaru EJ255 2. But, if your going to get the EJ257 heads I would go with those b/c of the AVCS. qgkhhmh ecrc ivsr zumirs wnx ivrtrv wqpc ymnk hyqsly rkznfkf