[skirbykat]

Input on IAG blocks....I would recommend installing a block heater, as warming motor up to temp is critical. Since the forged pistons expand slightly, there is noticable piston slap and high aluminum counts in my Blackstone reports. IAG also offers on their stage 1.5 block a tighter piston to wall clearance. This and the heater for where you live.

Compression ratio will change, so tuning would be involved, even with a stock turbo.

The checklist (in short) you will want to make should contain the following for reliable engine replacement:
New block.
New anything the oil touched (including oil control valves and avcs gears, oil pump, heads hot tanked and serviced, and even the turbo as suggested, or rebuilt at minimum.)
Engine rebuild gasket kit
Killer B oil pick up
OEM timing belt kit, depending on service history
Turbo inlet (as this is likely to shred upon removal)

To make a little more power add ARP head studs, downpipe, fuel pump, and injectors to a new turbo/intercooler and you'll be making folks jealous!!!

Whether you go OEM or performance, this project can be pricey, but worth it if you love the car. Be sure to check out SH build threads on here for ideas....mine started basically where you are at now.

Edit - Add in a quality air oil separator

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[skirbykat]

STI motor (EJ257) has variable exhaust timing, so you will probably need to also get an ecu from STI to make it happen, or at least custom tuning. Also, your stock intercooler will not mate up, so an appropriate unit will be needed there as well.

Have you considered a new short block from Subaru? That is really the only way to avoid custom tuning and many further expenses.

If your plan is to up the power, you should consult a tuner. Stock replacement really is the only plug and play solution considering (I assume) your stock ecu.

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[skirbykat]

You can get a stock short block from heuberger or other online parts places like flat irons tuning. 1600-2100 bucks if recall. That motor you posted might or should work too but that’s a long block. You could save money by using all your parts on your current motor except the short block. Maybe send your heads to a Subaru specialist like ASF machine in grand junction CO to get reworked and put all the parts on the new short block.

https://www.flatironstuning.com/subaru-oem-shortblock-04-08-sti-ej257

This!!!!

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