i have a 2.5 rs and its sohc but was wonderin if it was possible to change heads of a dohc. asked many people even at dealers but many said diff answers whats the REAL answer?

 

BAD idea, not only will it be hard to do, but it wont be worth it...AT ALL! reasons: sohc 2.5 heads flow like the grand canyon and are proven to be more reliable, dohc heads have head gasket issues and dont have any real good thing about them, heres the biggest thing THEY BOTH MAKE THE SAME HP!: 165. aside from computer issues from swapping heads trying to run a sohc computer on a dohc car, it will work, but WHY is the question. Maybe you mean dohc wrx heads? if so it would require the intake manifold and flapper valves, and hp gains would be minimal. if you want to do a head swap to increase HP, go with sohc phaze II 2.2 heads, they flow pretty well, and they would increase the comp ratio to about 11 to 1...it would be a potent little stoplight battler.

 

Where would i get phaze 2 heads?
I need stuff for my 2.2 L awd 97
I cant find anything I, have lack of knowledge.
just want few more whp.
any suggestions on where to start?
also listing to the grape vine I heard that swichting head gasket sizes on dohc to the spec sohc make better flow anyone else heard of this?

 

from what i've heard the dohc engines have a stronger block than the sohc. am i right on this? dohc means one more cam to buy if you upgrade!

 

I hear over from NASIOC that the techworks phase II cylinder head set (SOHC and DOHC) w/ 2.5" exhaust can blow the WRX away and keep up with the STi. (Both being stock of course). I don't know how true this is. However, the email came from Techworks. And I really respect what they do to NA Subarus.

Opinions?

 

I think DOHC is better way to go...

 

explain why then i'll listen, sohc heads flow better, make the same HP and are more reliable in the head gasket dept and you'll only have to buy 2 cams, not 4! and spark plug changes are a breeze...so why are the dohc's better?