EJ255 / EJ257 BLOCK WITH EJ20 HEAD "FSR" 2004+ IMPREZA STI, 2005+ FORESTER XT, LEGACY GT, 2006. The combination of the small chamber EJ255 head and shorter piston dome make the 8.4:1 CR. The difference is the piston dish and heads. The EJ257 and EJ255 share the same block castings, crank, and rods. They are forged from high quality SUH35 metal on the Intake side and Inconel 751 metal on the Exhaust side to deliver long life and prevent extreme wear and tear.
The TOMEI Oversized Valves EJ207 EJ255 are essential to keeping a high powered Engine reliable. We offer a wide range of OEM auto components that will fit your vehicle perfectly-from exterior accessories to performance parts. SubaruOnlineParts is your one-stop-shop for genuine Subaru parts and accessories online. Buy Genuine Subaru Car Parts & Accessories Online. Pistons: PSUEJ25T4: STD 020 040 (set of 4) Rings not included Use RS8296 piston rings Compression height 30.7mm -4.8mm. In this article I am going to cover the current trends with the Subaru Head gasket problem focusing only on the phase 2 2.5l SOHC from 1999 to 2011 in the Forester and 2000 to 2009 in the Legacy, Outback and Impreza with an emphasis on the 2005 and newer models. Subaru Head Gaskets Explained part II. The only difference in the shortblock of this EJ255 and the 04-06 EJ257 is the pistons. This is the newer AIS equipped EJ255, which uses a slightly different AB630 shortblock, as well as the AB820 heads. Adding an additional sealer can hinder the performance of an MLS head gasket. 
001" thick viton rubber that is bonded to the outer stainless steel layers.
Cometic Multi-Layer Steel (MLS) head gaskets go on dry because they are coated with a sealant. Best used with larger volume intake manifold and suits up to 30lb boost and 8000 RPM with recommende Racing camshafts to suit well optimised competition engines in the 500-700hp range. Genuine Subaru Impreza Forester Legacy Valve Spring Seat EJ205 EJ207 EJ255 EJ257. Gasket Head Oil Return AVCS 10931AA010. TD04L Turbo Turbocharger Fit For Subaru Impreza Forester EJ255 08-11 49477-04000. 2004-09 Subaru Forester H4 2.5L Turbo (Engine ID EJ255) Head Gasket Set. 2004-06 Subaru Baja H4 2.5L Turbo (Engine ID EJ255) Head Gasket Set. 2006 Saab 9-2X H4 2.5L Turbo (Engine ID EJ255) Head Gasket Set. 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. These are brand new, blank OEM EJ257 B25/V25 Heads straight from Subaru. Oil Pickup / Oil Control Baffle / Windage Tray Options: The IAG Performance Subaru WRX / STI oil pickup was designed by Tigwerks to replace the OEM EJ25 oil pickup, which is prone to failure. Compression Ratio: 8.5:1 on D Cylinder Heads (EJ255) Compression Ratio: 8.2:1 on B, V and W EJ257 Heads with standard thickness gasket. Head Gasket Set Bolts Fits -04 Ford Mustang F150 3.8 4.2 OHV VIN 2 4 6. Forged Piston w/ Ring Set EJ255 EJ257 SC7420 Fits 04-19 Subaru 2.5L Impreza WRX. The key difference in the new EJ255 with the D25 heads is the fact that the D25 heads had a smaller combustion chamber volume (approximately 51cc's down from ~56cc's in the B25 heads) and they also saw the introduction of secondary air induction that required new ports in the heads. Maintain Your Timing and Camshaft To Keep Your Engine Running Efficiently The best camshaft holding and lock tools for cars and trucks helps you properly replace the timing belt in your vehicle. 
From custom Subaru Wiring Harnesses to Replacement OEM Plugs we have everything needed for wiring Subarus iWire specializes in all things Subaru Wiring related.The engine block is actually manufactured in one piece with the water jackets cast into the block and cylinder head. These passages let the coolant circulate around the "hot spots" (valve seats and guides, cylinder walls, combustion chamber, etc.) in order to cool them off.
The water jacket is a collection of passages within the block and head. EJ257 short block compatible with EJ255 heads? Jump to Latest Follow 1 - 4 of 4 Posts. #TOYOTA ENGINE BLOCK CASTING NUMBERS CRACK#
The only exceptions to this rule are: If you overheated the engine: this can warp and/or crack the cylinder heads. What about my heads? 9 times out of 10, Subaru cylinder heads are reusable following an engine failure.
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