Afternoon everyone,
just a little bit of advise required please. I have a 04 plate uk wrx. What cylinder block would be best for me to upgrade too? Will need to fit my heads etc to it. So which of the below be best to get? im wanting to upgrage turbo etc but want strongest possible motor
1. Standard uk wrx 2.0
2. Uk sti 2.0
or
3. uk 2.5
Im able to get the above short motors brand new.
Any help or advise from experience will be really appreciated.

Best regards

 

I would go for the STI 2.5 block if you can get hold of it. It is semi-closed deck so is stronger than a WRX block. They are good for about 500bhp-ish

I've done the same but my EJ20 WRX heads are being quite heavily modified so be as strong as possible

 

cheers for reply al20uk. do the heads bolt on or is there any machining required? what mods are you doing to your heads?

 

I'm having mine machined to match the 2.5 cylinders. They are also having bronze valve guides fitted, uprated valves, springs, retainers and cams, last but not least ported and polished.

I've heard different opinions about just bolting the 2.0 heads onto the 2.5, some say its fine but others recommend machining, i chose to go with the latter as it seems more logical.

 

sounds cool mate? are you going for 500bhp? Could you pm me the spec etc so i can copy you! lol also if you dont mind rough prices for the work you had done to heads, parts etc

 

my heads were re machined for my 2.5 block. Id say that 500 is on the optimistic side of things for long term reliability on a 2.5 though. Im considering replacing mine with a closed deck stroker block to get me over the 500 mark.

 

I personally think the OEM 2.0 STi (2001 onwards) is stronger than the STi 2.5 short motor, in standard form.

You need to decide what you want form the car long term...

 

cheers for replies all, basically wanting to have a safe reliable motor for bit of fun, hoping for around 350 400 bhp mark.

 

2.5 short motor, 20G turbo, circa 380bhp, 380 lb/ft. Great road car.

 

thats what im after, got great roads around here.

 

PM sent mate, took me ages to write it

 

cheers mate, very much appreciate it! will go away and study it! lol

 

No worries mate.

remember though, numbers etc are not really important, its how the car feels to you that is more important.

Good Luck with your project.

Andy

 

yeah i know claimed numbers are just pub speak, as long as it brings a smile to my face thats all im concerned with. standard 225 or so did, so im sure with the upgraded motor, turbo etc and Andy Forrest ecutek map, i should be grinning ear to ear!

 

iv got a uk 2003 uk spec sti long engine with turbo needs intake cam belt and cam wheels ect was making 310 with a remap removed by zen to make way for big spec 2.5 (way over 500)
sitting on a pallet in essex paul at zen will vouch for the condition of the motor befour he removed it ...serious offer??