RallyKeith Posted April 20, 2006 Share Posted April 20, 2006 So, I might be able to get a cheap short block from a 99RS, but I think that means it's a SOHC. Can I put my DOHC heads on it with out any problems, and will it bolt in place of a 96-98 IE Plumbing for PCV? Keith Link to comment Share on other sites More sharing options...
cookie Posted April 20, 2006 Share Posted April 20, 2006 I trust you mean 2.5? The later DOHC 2.5s had the same block as the SOHCs and replacement of the early ones is with the later. Link to comment Share on other sites More sharing options...
RallyKeith Posted April 20, 2006 Author Share Posted April 20, 2006 I trust you mean 2.5? The later DOHC 2.5s had the same block as the SOHCs and replacement of the early ones is with the later. Sorry, I thought I put that in the title. EJ25 What do you mean that replacement of the early one is with the later? Link to comment Share on other sites More sharing options...
cookie Posted April 20, 2006 Share Posted April 20, 2006 I understand the dealer only stocks one normal compression 2.5 block. The later one replaces the earlier one. At one point I was considering buying a 98 Forester with a bad engine, that's what the dealer told me at the time. Link to comment Share on other sites More sharing options...
TheYeti Posted April 20, 2006 Share Posted April 20, 2006 The 99 block will work with your heads. Link to comment Share on other sites More sharing options...
ballitch Posted April 21, 2006 Share Posted April 21, 2006 yeti is right, you can use the newer SOHC block under your DOHC heads, direct drop in. however you will take a small lowering in CR by doing this. if i were you i would look into getting a whole SOHC motor and replacing your DOHC heads. ~Josh~ Link to comment Share on other sites More sharing options...
TheYeti Posted April 21, 2006 Share Posted April 21, 2006 Aren't the piston heads about 1mm shallower on the phase II's? That would bump the CR slightly when using the DOHC heads, wouldn't it? Link to comment Share on other sites More sharing options...
Storm Posted May 1, 2006 Share Posted May 1, 2006 Aren't the piston heads about 1mm shallower on the phase II's? That would bump the CR slightly when using the DOHC heads, wouldn't it?Yes. You'll take a CR hit when you put SOHC heads on a phase I block. The DOHC combustion chambers are about 2cc smaller than SOHC heads. The only Issue I see with putting the DOHC heads on the phase II block is the need for the correct intake manifold since the bolt pattern is different. Other than that....it's legos for everyone! Jay Storm Link to comment Share on other sites More sharing options...
Gnuman Posted May 1, 2006 Share Posted May 1, 2006 Yes. You'll take a CR hit when you put SOHC heads on a phase I block. The DOHC combustion chambers are about 2cc smaller than SOHC heads. The only Issue I see with putting the DOHC heads on the phase II block is the need for the correct intake manifold since the bolt pattern is different. Other than that....it's legos for everyone! Jay Storm Ummm, the intake manifold bolts up to the heads, not the block. Link to comment Share on other sites More sharing options...
970subaru Posted May 1, 2006 Share Posted May 1, 2006 I think thats what he was saying. Link to comment Share on other sites More sharing options...
Storm Posted May 1, 2006 Share Posted May 1, 2006 I think thats what he was saying. Link to comment Share on other sites More sharing options...
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