So I have a spare ej22 shorblock from a 94 Legacy and was wondering if one can build a more dependable Subie (these 2.5's are time bombs!) by placing the ej253 heads from a 2008 Forester on that eJ22 shortblock. Anyone have experience with this sort of Frankenmotor?

you likely know this is a reverse Frankenstein...and should be a low compression version. But I'm not familiar w/those Phase 2 (version 2?)  i-AVLS heads, which may not play well w/the Phase EJ22 block.

 

Search on reverse Franken, etc.  - it's been done or you'll read why NOT to do it.