EVOthis Posted November 23, 2007 Share Posted November 23, 2007 Hello all just a quick question.....what exactly is the difference between phase 1 and phase 2......is it the cylinder head? any insight would be appreciated..... Link to comment Share on other sites More sharing options...
nipper Posted November 23, 2007 Share Posted November 23, 2007 Hello all just a quick question.....what exactly is the difference between phase 1 and phase 2......is it the cylinder head? any insight would be appreciated..... Double over head cam engine (1) as opposed to single over head cam engine (2) nipper Link to comment Share on other sites More sharing options...
idosubaru Posted November 23, 2007 Share Posted November 23, 2007 NASIOC has tons of information about swapping heads and differences, compression, etc if that's what you're looking for. Link to comment Share on other sites More sharing options...
RenaissanceMan Posted December 2, 2007 Share Posted December 2, 2007 Phase 1 is 96-97 DOHC hydro lifter Phase 2 is 98-99 DOHC solid lifter (Phase one heads have a square spark plug tunnel, and phase 2 have sort of a diamond shape) *edit* Sorry, I should mention this is for the EJ25D model engine Link to comment Share on other sites More sharing options...
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