1197sts

I am not sure about your situation, but I have experienced similar troubles with mixing and matching forester vs legacy engines, the difference in that case was the cam pulleys, resulting in the need for a different timing belt. (This is assuming the intake is ok). The pulley has a slightly different diameter/number of teeth, if I remember right it is the drivers side pulley. The black plastic gear from the forester is definitely different from the legacy, not sure about the other models. There are also little protrusions cast into the back of this pulley for timing, these can be different as well. I think if you swap all of your timing pulleys and gears from the original engine to the new you are ok, anyone else know if that is correct? You have to be careful because it can result in a one of a kind configuration if you do it this way.

I am looking at a used EJ 2.5 sohc shortblock, are there any identifying features I can use to determine what exactly it is? Any way to tell a 251 from a 253?

I just did a seafoam treatment on my 2002 OBW induction system, it did the usual lots of billowing white smoke for a while and then a nice and smooth idle. However it threw a code, P1507. I was able to reset the CEL. Has anyone else experienced this? I am hoping that the only reason for the code is due to running rough while the seafoam does its thing.

How hard is it to swap a EJ22 in place of a EJ25 phase II? I have searched the EJ22 EJ25 swap threads, it seems it is possible but more involved. Anyone have experience with this?