new heads for the Rex

[kennwrx]

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I want to do new heads but I don't know what valves or cams to use I posted on nasioc and they were no help my question is will 2.5 sti heads work and will they increase the hp.

[JET02WRX]

I'm not 100%, but I do not think that swap will work, nor would I think it be as cost effective as doing the reverse....using a 2.5 block with 2.0 heads. I'm assuming you have a 2.0 since you don't say so in your post.

[Jeffros Spec V]

I'm assuming you have a 2.0?

You can fit STi heads onto a 2.0 but I believe you'll need the sti intake manifold, wiring harness and avcs crap.

Definitly not worth it. Get a nice set of cams and p&p the stock heads.

[kennwrx]

yes its a 2.0 how about sti cams in my stock heads ?

[Jeffros Spec V]

Originally Posted by kennwrx

yes its a 2.0 how about sti cams in my stock heads ?

I have STI cams in my 2.0 heads. You have to plug the holes in them for the AVCS which isn't hard. And while they flow a lot more up top they have the same duration as 2.0 cams.

My suggestion is if you're going to do cams save up and get some 272's or something more worth while.

[TROLL]

there isnt a huge difference in the wrx heads vs. sti heads... it really wouldnt be cost effective to do either although it could be done with the right combo of parts... but it probably wouldnt show much gain.
if you're looking to do something that makes a big difference, get an sti shortblock in your car and reuse your wrx heads and everything else... that'll transform things.

[kennwrx]

thanks Troll thats what I wanted to hear I can get a 2.5 block pretty cheap

[TROLL]

of course another option would be to get an sti longblock and swap that in whole, adapting it to your stock wrx wiring. its a little subaru trickery but it is very possible
even more power than the hybrid and it'll allow you to sell your wrx engine whole which will make it worth quite a bit more.

[SpendOne]

I have a set of 2.0 heads p&p with all new Ferrea valvetrain. All it need is a set of cams.

[kennwrx]

what do you want for them ?and where can I get 272 cams ?

[xEJ20x]

Originally Posted by kennwrx

what do you want for them ?and where can I get 272 cams ?

http://www.jscspeed.com/wrx/engine/crower_cams.htm

[RayArroyo]

i have some bc stage 2 272 cams for a 2.0l in stock

599.00

[kennwrx]

OK hears the deal I have 281whp and the car has 203,000 But Iam trying to get more power with out doing the bottom end If I do the heads with cams what do you think that will produce in hp (1000 cc injectors lite flywheel vf 39 ported up pipe and divorced down pipe sti intercooler turbo intake pipe ) with these mods

[TROLL]

why dont you want to do the bottom end? you've got to pull the motor regardless whether you're doing top end or bottom end, and its a much more direct route to power to do the bottom end...
you could always pick up an sti longblock and just do both... its not THAT much more money to do than just the shortblock (or just the heads which is pretty uncommon)

[kennwrx]

its not the money part as much as the time I could do the heads in a afternoon .... but I will do the whole thing at one time now that I think about it

[Jeffros Spec V]

Go with a 2.5 bottom end.

I have one and it's great!

[TROLL]

you cant do the heads in an afternoon though... unless you know something i dont.

changing heads is much more involved on a boxer engine than it would be on an inline or even a V... its pretty much exactly the same work to do an assembled shortblock as it will be to do heads. you'll have to pull the intake manifold including fuel rails and wiring harness, and the motor will have to come out regardless if you're doing cams or heads. the only thing that would be less work is to do an STi longblock which could potentially be done in a day if you didnt run into any snags and had all the parts you needed ready to go.

[kennwrx]

http://cgi.ebay.com/ebaymotors/ws/eB...010016691&rd=1 how about something like this

[Jeffros Spec V]

Originally Posted by kennwrx

http://cgi.ebay.com/ebaymotors/ws/eB...010016691&rd=1 how about something like this

I paid a LOT less for my brand new EJ257

Like troll said get in touch with M&J

[TROLL]

yeah thats going to be a good route to go, except you can probably get it cheaper through our vendor here, M+J Modified... get in touch with them for any and all OEM Subaru parts.
keep in mind that you'll also need an engine gasket kit, and it also makes a lot of sense to replace your oil and water pumps and your timing belt.... this adds at least a few hundred to the cost, plus time and labor to assemble. its a great way to go and a lot of people do it, but all said and done i feel like it makes just as much sense to go with an STi longblock and skip all of the gasket, oil and water pump, timing belt, etc. and a lot of the labor on assembly. you could also sell your motor complete if you did that so it'd be worth a bit more.
either way you cant go wrong though...