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Old 04-15-2012, 12:22 PM   #1
farrell
Scooby Specialist
 
Member#: 47746
Join Date: Nov 2003
Location: east stroudsburg PA
Vehicle:
2000 Impreza 2.5 RS
silverhorn

Default 02 wrx with sti block..any mods needed?

i picked up a 02 wrx with a bad short block, rather then tear that engine apart and replace the internals, i have a spare sti block laying around from an old project. can i just bolt the wrx heads up to the sti block, tune for it and be good to go? im not looking for performance and dont wish to have anything aftermarket or change the boost or anything. just r&r and be able to drive it? its a 02 wrx and the block is an 04 sti block. thanks guys!
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Old 04-15-2012, 01:12 PM   #2
RexWagonWA
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Member#: 221945
Join Date: Aug 2009
Default 02WRX with STi block

I have this engine combination. For long term reliability you need to have your WRX heads machined to match the STi block.

To those who do not believe this is needed. I have seen multiple WRX heads on Sti blocks without this machining. They do not work very well with the gas available on the West Coast.

Since you say you do not need high performance, keep the STi pistons if you need to save money.

GLWYB
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Old 04-15-2012, 02:04 PM   #3
farrell
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Join Date: Nov 2003
Location: east stroudsburg PA
Vehicle:
2000 Impreza 2.5 RS
silverhorn

Default

thanks. is this modification something i could simply dremel out? the car is automatic and will be just a daily driven car for my wife. i doubt if she will ever even see 14.7 psi. this is more just a out of convience thing rather then rebuilding the wrx block. do you think i would be better off rebuilding the wrx block or be ok to use the sti block as a "oem" replacement?
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Old 04-16-2012, 01:59 PM   #4
RexWagonWA
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Join Date: Aug 2009
Default 02 WRX with STi block

This is not possible with a Dremel tool. You need a machine shop with lots of Subaru experience. The reason for modifying the head is to match the 257 bore and to eliminate the sharp edges and lips that can cause detonation.
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