Quote:
Originally Posted by hiremichaelreid
Well now that I've read the entire thread and some associated links it's clear that this threads main thrust is the head gasket problems on 2.5 L EJ25 engines, regardless of vehicle.
My take is that a bad head gasket design is the source of the problems. It appears this affects model year 1996 (or 95?) to 1998 or 1999 phase 1 DOHC engines the worst (with internal leaks). Appears to be a little better (external leaks) with 1999 or 2000 to 2002 phase 2 SOHC engines.
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Actually, what is not really stated here is a block change over the years as well. The phase-2's and up had support ribs from the external walls of the block to the top of the cylinders. The phase-1's didn't. This allowed the cylinders to wiggle around which "wore a hole" into the HG.
Using later model HG's helped this, but did not totally fix it.
I finally fixed it by using a rebuilt STi 2.5L SB and my original DOHC heads.