The biggest power subarus tend to use closed deck blocks, I think the P1 2.2l CDB is the most saught after and a capacity of around 2.35 seems to be good to contain really high boost. My ultimate plan will probably be based on a CDB opened out to 2.5l with sleeves. At the moment I just want to get the car 'finished' and on the road before re-doing things...
I've just come in from stripping the long block right down and cleaning it up, it's definitely a CDB!
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