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Old 11-14-2001, 02:22 PM   #1
Scooby Specialist
Member#: 2697
Join Date: Oct 2000
Location: Olney, MD. Work in McLean, VA
2000 Celica GT-S
Spectra Blue

Default swapping out DOHC 2.5L engine for SOHC 2.5L engine

Does anyone know whether it is possible to swap in a 2.5L DOHC engine with a 2.5L SOHC engine into a 97 legacy (assuming I have the ecu as well)? Also, would the transmissions line up as well? I have the opportunity to buy a new engine and ecu and was thinking that I might as well go for the more "reliable" of the two designs. And NO, I'm not even considering a 2.0L swap - way too much money.

I'm looking for a pretty straight forward "bolt in" swap. I know there will be some issues with rewiring the ecu's (I hope I"m wrong about this though), but other than that I heard the two engines have the same dimensions and use the same mounts.

If anyone has more information about this, I'd greatly appreciate it.


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Old 11-14-2001, 03:24 PM   #2
Scooby Newbie
Member#: 12224
Join Date: Nov 2001
Location: Evergreen, CO
2000 RS;Spec Miata
Del Sol Si


the blocks are basically the same. the sohc has been slightly modified on the inside. the swap should be pretty easy. a mechanic told me there have been a lot of problems with the dohc. try looking at the engine projects on www.cobbtuning.com for soem more detailed info.
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Old 11-14-2001, 04:58 PM   #3
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Member#: 251
Join Date: Sep 1999
Location: Chicago, IL
1998 Impreza 2.5 RS


Or just have the best of both worlds and mate your DOHC heads to a SOHC block. My Phase 1 (what you call GEN 1) engine in my 98RS was eating about 1-1.5 qts of oil every 1000mi. I got the dealer to open the engine block up and SOA warranteed the whole engine. It's now considered a Phase 1.5 engine.

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