September 30, 200916 yr Hi everyone, Just got my hands on a 78 Hatch. I'm thinking about swaping 1996 EJ25 DOHC into it. Is it possible without chassis modification as I want to keep the chassis original? If the answer is no then can I use the SOHC head and manifold from EJ16/18/22 to reduce the overall width? I will appreciate any comment. Alex
September 30, 200916 yr No, it won't fit without cutting the frame rails a lot, if you can even get it in there. You might even have to notch the rails a bit for the sohc. Yes, you can put the sohc phase 1 heads on the 2.5 dohc phase 1 block, but it will raise the compression.
October 1, 200916 yr Author No, it won't fit without cutting the frame rails a lot, if you can even get it in there. You might even have to notch the rails a bit for the sohc. Yes, you can put the sohc phase 1 heads on the 2.5 dohc phase 1 block, but it will raise the compression. Thanks. The raise in compression ratio is what I'm looking for. I want about 11:1 CR. Is EJ25 block wider than EJ22 block? If yes, can anyone tell me how much wider? Alex
October 1, 200916 yr All EJ engine blocks are the same width. The DOHC heads are bigger. The engine is about 3-4" wider. I have both here, I will try and remember to measure them.
October 1, 200916 yr Just got my hands on a 78 Hatch. Are you sure you have a 78 Hatch? Perhaps it is a 1980's hatch? It is my understanding EJ engines will fit far easier in 1980's model Subaru's (...and I have never seen a 1978 Hatch:)).
October 2, 200916 yr Author Just got my hands on a 78 Hatch. Are you sure you have a 78 Hatch? Perhaps it is a 1980's hatch? It is my understanding EJ engines will fit far easier in 1980's model Subaru's (...and I have never seen a 1978 Hatch:)). I not so sure. I thought it's 78, but I might be wrong. It may be 80s like you said. Alex
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