Originally Posted by AZScoobie
What ever you do dont run the 2.5 block with the EJ205 heads. Its really not a good combo. I tune them all the time. They are knock happy and just not a good sounding motor.
Dan, If you put the 2.5 block in make Damn sure you get some thick head gaskets. If you dont you will end up with Compression of 9.2-9.5 to 1 and its a BEAR to make any power on pump 91.... Get custom pistons in the 8 to 1 range or at a min get the thicker Gaskets.
Is this also true if the valvetrain is upgraded? Supposedly EJ205 heads have the same sized ports as an STi head, so would a good valvetrain kit plus cams be a good match?