2.0 heads on a 2.5 block
Registered User
Joined: Dec 2007
Posts: 460
From: San Francisco
Car Info: 2004 Subaru WRX
yup, I've done it. Doing it again right now (unfortunately, ugh....don't ask).
anyway, you either 1) get custom pistons to give you the proper compression ratio with OEM gaskets OR
2) like just posted, thicker gaskets. I've been using (and will be using again) .060" gaskets. No issues over the past 55K miles.
anyway, you either 1) get custom pistons to give you the proper compression ratio with OEM gaskets OR
2) like just posted, thicker gaskets. I've been using (and will be using again) .060" gaskets. No issues over the past 55K miles.
Thread Starter
Registered User
iTrader: (1)
Joined: Dec 2007
Posts: 130
From: Martinez CA
Car Info: 02 wrx sport wagon
im throwin misfires all over very random....ive leaked it down many times everything is perfect also changed coil packs, injector, plugs, fuel regulators bov, ran mbc and i have no flippin idea whats goin on....i used oem gasket....i have a axis stg2 shortblock w/ forged pistons.......also my car shows no signs of misfire but ecu says so......any ideas
Registered User
Joined: Jul 2005
Posts: 63
From: Scottsdale, AZ
Car Info: 2005 WRX wagon
What kinda power are you guys making with this setup? I was thinking about doing the 2 liter heads, ported with an sti 2.5 block, but was wondering what kinda power it made, how reliable it was compared to just doing an entire sti swap, and does it give you a little more top end power due to the wrx heads then a regular sti motor would? Thanks for the advice.
Registered User
Joined: Apr 2003
Posts: 170
From: SoCal
Car Info: 2.5RS STI swapped
I just got my new motor installed. Feels great so far. It's still in break-in however. STI 7 heads with a 2.5 shortblock with factory 2.5 headgaskets. I think CR is 8.7 or something. Should be fine. I haven't got into boost yet but it already feels like it's going to have some legs compared to the 2.0 I had before.
cheers
poorman
cheers
poorman
Registered User
Joined: Mar 2007
Posts: 137
From: Stockton
Car Info: 2002-WRB-WRX-EJ257-stg2 / 2007-DGM-LGT-Ltd
2.5L STi SB swap right here, no problems yet, *crosses fingers. Heres what i had done:
OEM STI short block
Machine 2.0L heads
ARP Head studs
PE kevlar Timing belt
NGK Iridium plugs
Over haul Gaskets kit (w/STi head gasket)
Cosworth Blueprinted Oil Pump-W/ high pressure mod
Sti Waterpump
Thermostat
and i think a couple of little things.
Car runs great, except for the little noises i hear (tranny, suspension stuff).
I kept the high compression and GST motorsports tuned and installed everything for me. I love the very aggressive low end that comes with the high compression rate, I just need a bigger turbo to get a better top end. But i'll need a tranny upgrade before i go there.
OEM STI short block
Machine 2.0L heads
ARP Head studs
PE kevlar Timing belt
NGK Iridium plugs
Over haul Gaskets kit (w/STi head gasket)
Cosworth Blueprinted Oil Pump-W/ high pressure mod
Sti Waterpump
Thermostat
and i think a couple of little things.
Car runs great, except for the little noises i hear (tranny, suspension stuff).
I kept the high compression and GST motorsports tuned and installed everything for me. I love the very aggressive low end that comes with the high compression rate, I just need a bigger turbo to get a better top end. But i'll need a tranny upgrade before i go there.
iClub Silver Vendor
iTrader: (25)
Joined: Nov 2002
Posts: 15,494
From: Participating in some Anarchy!
Car Info: 2005 LGT wagon
What kinda power are you guys making with this setup? I was thinking about doing the 2 liter heads, ported with an sti 2.5 block, but was wondering what kinda power it made, how reliable it was compared to just doing an entire sti swap, and does it give you a little more top end power due to the wrx heads then a regular sti motor would? Thanks for the advice.
i have an sti 2.5 block new 2.0 heads new arp head studs and cosworth head gaskets.. and i got the engine in the car and got it fired and suprise water in the oil... do you think it could have been the block not sealing ???
Registered User
iTrader: (6)
Joined: Mar 2006
Posts: 9,581
From: on the way to lake tahoe to shread! turbo beast
Car Info: 2016 WRX, 2014 lifter forester XT, 2005 JDM207 WGN
i'm one of the iclubbers running 2.0l heads on my full built sti engine and everything works great.
