Choose options
STI W20 EJ207 Short Block – 10103AC510
This is a brand new, genuine Subaru short block for the 08–21 JDM WRX STI, featuring the STI W20 EJ207 engine. Ideal for high-performance street or motorsport builds, this semi-closed deck block is built for strength and reliability.
It includes cast STI pistons and a thick-wall bore design for improved durability under boost. Assembled by Subaru to factory specs, this is a trusted option for fresh builds or replacements.
- Semi-closed deck 2.0L EJ207 block
- Thick-wall bore for added strength
- Cast STI pistons pre-installed
- Factory-assembled and brand new
- Fits 2008–2021 JDM WRX STI (W20 engine)
Note: Short block only – heads, gaskets, and accessories not included.
No instructions available for this product.

Need Help Finding the Right Part?
We’ll Track It Down for You
We know how frustrating it can be searching for the right part. If it’s not listed on our site, that doesn’t mean we can’t source it.
Fill out the quick form below and our team will track it down for you.