[HTi]Johnson Posted May 23, 2007 Share Posted May 23, 2007 Hello. I was wondering if the DOHC heads off my outback will fit a 2.5 block that originally was SOHC? Thanks for your time. Link to comment Share on other sites More sharing options...
ShawnW Posted May 25, 2007 Share Posted May 25, 2007 Yes. Direct swap no problem. Link to comment Share on other sites More sharing options...
86BRATMAN Posted May 25, 2007 Share Posted May 25, 2007 I think the combustion chamber is smaller on the dohc, so you'd have somewhat higher compression ratio after the swap. Link to comment Share on other sites More sharing options...
ShawnW Posted May 25, 2007 Share Posted May 25, 2007 Nope just a difference in the pistons themselves but compatible all the same. SOHC pistons are higher compression. Link to comment Share on other sites More sharing options...
Aspen Posted May 25, 2007 Share Posted May 25, 2007 Your new compression ratio will depend on the gasket you use. I suggest a cometic 60 thousands. Should be around 10.6:1. should be good on 89 octane. Link to comment Share on other sites More sharing options...
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