Ej20 Vs Ej25 Head Gasket, Aug 28, 2015 · The gaskets must match the bore of the block in the EJ22D hybrids, not the head chambers. 0 heads. . The plan is to build using EJ257 short block and EJ253 heads (probably upgrade to delta cams and some springs). EJ25 block + EJ20 heads. Dec 27, 2025 · If it is a head valve cover gasket alone, probably I don’t have to pull out the engine, but the clutch is also near its time. I understand they come with the single layer head gaskets and I need to have those replaced but straight from the factory is one more reliable than the other? Apr 2, 2025 · According to our research, most of the EJ head gasket failures occur around the 100,000-mile mark and start as a slow oil or coolant leak. May 11, 2022 · Here are the ways to do it: 1. As good of an idea as invading Russia in winter. Dec 29, 2025 · You might want to learn about [timing belt replacement costs, general replacement guide, Subaru head gasket issues] (timing-belt-replacement-cost, timing-belt-replacement-guide, subaru-head-gasket) before making your final purchasing decision, especially since head gasket labor often overlaps with timing belt labor on these cars. Because the labor to change the head gaskets and to swap the engine is very similar I am wondering what people's thoughts are for opting for a JDM EJ20 vs the EJ25. This is merely a dd that will get me to and from work. 2. Would I be using head gaskets for an ej20 or 25? Can’t seem to find consensus. The EJ251 commonly experienced head gasket failures in the form of interior channel breaches or exterior fluid leaks due to the use of a single layer coated gasket, vs the Multi-Layer Steel (MLS) gasket used in later models. Easy. 3. The tell-tale signs often include unexplained coolant loss, rising engine temperatures, and white, sweet-smelling smoke from the exhaust. However I think an 04/05 Forester motor is the same as ej257 sti's. Music from #Uppbeatmore Subaru has redesigned the gasket 3 times and the new multi-layer steel ones work well. Jun 19, 2024 · The saving grace is that the standard failure on these gaskets is between the lower oil return passage and the exterior of the head, so the result of a head gasket failure is merely an external oil leak. Tuner will likely need to run less timing that optimal for MBT (maximum brake torque). But if you thinking of hybridizing 205 and 255, i am not sure on which head gasket to use maybe someone does Nov 4, 2022 · Whant to know what happens when you use an EJ20 head gasket in an EJ25… ask me! Yes! I did it. Get JE FSR hybrid pistons when, due to their design, are the correct compression ration with 2. More room for dead area away from the combustion, quench pads on the deck of the head near the block are mismatched to the bore & piston. Mar 15, 2011 · According to this post he put the ej251 head on with a commetic head gasket and it worked. I chose option 2. Stack some head gaskets to get close to the compression ratio. The head gaskets seal the small passages carrying oil and coolant between the engine block and cylinder heads. However, you have to catch it early and really do a good job of prepping the deck and the cylinder head before installing the new gaskets. I came upon an interesting blog site May 19, 2023 · Can anyone tell me from personal experience whether the JDM EJ20 or JDM EJ25 is a more reliable engine from factory? I'm looking to replace the US spec ej25 engine in my 2005 Subaru legacy. 0 heads machined to the correct compression ratio. Feb 11, 2026 · Head gasket failure is one of the most talked-about EJ25 issues. Expensive. Feb 7, 2008 · I've been searching the internet to get more info on the dreaded EJ25 head gasket issue ('cause knowledge is power, right?); we who own Subes with the EJ25 engine are, of course, living with a Sword of Damocles hanging over our heads (heh, heh, nice pun, no?). Keep in mind the EJ20 was an option in the Forester in Japan, and I am not looking for a race car. Subaru EJ25 / EJ20 SOHC head gasket repair and rebuild. Sep 9, 2004 · well, the 2. Additionally, concerns over EJ25 head gasket failures have driven interest in the more robust EJ20 closed-deck designs. Also, 1996 heads are highly inefficient. Either the head gaskets are at risk from being larger than the bore (I tore apart a hybrid that failed this way), or the pistons themselves are at risk from the mushroom chambers created by that combo. Jan 13, 2026 · Enthusiasts are increasingly sourcing EJ20 engines—particularly closed-deck turbo variants—for lightweight chassis like the GC8 Impreza or even non-Subaru vehicles, aiming to replicate STi-level performance. Had both HG on the garage, was in a rurry, late at night trying to finish it to use the car next day. Have your 2. 5 is infamous for head gasket problems due to the open deck design, but a N/A motor has better low end torque for offroad use. Thicker Head Gasket- this is the least favorable in my opinion. 1. MLS steel head gasket. Oct 8, 2025 · On the EJ25, head gasket failure can be triggered by factors like overheating, high mileage, or increased cylinder pressures from performance modifications. I looked into the bore size needed for the ej20 and the ej22e and the ej25 and non of them match up . Jan 23, 2008 · Do you mean an ej 205 and ej 255, wrx motors? If so, then basically nothing but displacement. 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