The AK-1:
Equipped with forged pistons, the AK-1 is the perfect option for anyone looking to improve the reliability of their Subaru. The AK-1 is also an excellent replacement for a faulty stock engine.
 
Forged Pistons:
Thanks to their reinforced design and alloy, forged pistons offer increased reliability over stock pistons. For the assembly of your AK engine, we offer two choices of forged pistons (Cosworth, Manley) to suit your needs and budget.
 
Crankshaft Bearings:
The quality and durability of high-performance bearings are essential to the proper operation and longevity of your engine.
 
Engine Block:
We carefully machine our engine blocks to our own specifications to ensure high-precision assembly.
 

The AK-1 short-blocks are carefully assembled in our specialized workshop with the following components:
Forged piston set
New Subaru STI connecting rod set
New Subaru STI crankshaft
New connecting rod and crankshaft bearings
New Subaru EJ25 engine block
 
All our AK series engines have their own serial number printed on an identification plate affixed to the engine.
 
Built to our specifications, your AK series engine will give you peace of mind and allow you to fully enjoy the performance of your Subaru.
 
Contact us to learn about shipping options for this part.