Subaru OEM Shortblock w/ Heat Treated Crankshaft (09+ STI EJ257)

This is a brand New 2009+ STI EJ257 Shortblock with Nitride Treated Crankshaft.

Because this is a new part from Subaru, there is no core charge, and it comes fully assembled and ready for the cylinder heads to be installed.

No other parts are included with this short block, so items like cylinder heads, water pump, oil pump, oil pan, etc., would need to be ordered separately.

We also recommend purchasing a master gasket kit with this short block to make installation simpler.

If you are wondering what the limits are of the stock EJ257 shortblock, please take a look at our blog here!

Now Only $1,800.00 Regular Price $2,137.14

This is a brand new, completely assembled short-block directly from Subaru. This is the version out of the newest 2010 STi, and has the Heat treated crankshaft. Subaru no longer offers the nitride treated crank.

This is a great place to start if you are building a hybrid engine with your 2.0 liter heads on a 2.5 liter block. Or maybe you just need a replacement block for your STi. This comes with the block, crank, pistons, and rods completely assembled, and ready to bold your heads on.

If you are putting this block in a car that it was not originally designed for, it carries no warranty expressed or implied.

This part number has recently superseded to a newer number from Subaru. The previous part numbers from Subaru were 10103AB850, 10103AC050 and 10103AB950.


warning_symbolWARNING: Operating, servicing and maintaining a passenger vehicle or off-road vehicle can expose you to chemicals including engine exhaust, carbon monoxide, phthalates, and lead, which are known to the State of California to cause cancer and birth defects or other reproductive harm. To minimize exposure, avoid breathing exhaust, do not idle the engine except as necessary, service your vehicle in a well-ventilated area and wear gloves or wash your hands frequently when servicing your vehicle. For more information go to

More Information
SKU 10103AC890
Product Type Engine
Engine Shortblocks
Brand Subaru OEM
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