This is out of curiosity and not necessity, but came up in conversation and I am not sure of the answer.
I know that the phase one frankenmotor of 90-98 EJ22 heads on a 2.5 block make a high compression, higher HP motor.
Does the same hold true for using the 99+ Ej22 heads on a 2.5 block? I have been under the impression that the phase 2s were similar enough that it would run fine, but not create a much more powerful motor. (certainly not enough to surpass a phase 2 EJ25) But that's just what I've heard.
Anyone have more info? Or first hand knowledge of hp increase/decrease?
Edited by AdventureSubaru, 27 July 2017 - 07:39 PM.