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2009 Heads on 2001 Block

steve56
in 1990 to Present Legacy, Impreza, Outback, Forester, Baja, WRX&WrxSTI, SVX

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Have good 2001 ej25 block and a set of good 2009 ej25 heads. Can these be used together or do I need to find a newer block?

The compression will be low unless you swap the pistons, and the 2001 block has the wrong PCV system so it will need to be adapted. 

GD

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