Redline Motive

AMS Subaru EJ25 Short and Long Blocks

Whether you are looking to upgrade your existing Subaru drivetrain or replace your old engine that’s had it, AMS offers a number of Subaru EJ25 Short and Long Block Stages to support any current or future demands you may have for your Subaru vehicle.

All AMS Subaru short and long block assemblies use only the highest quality components to ensure maximum strength, power and reliability. Each block is checked for correct dimensions, cylinder bore, mains and block flatness – then hand assembled at AMS using the same exacting care as in our championship winning race engines.

AMS SUBARU STI EJ25 SHORT BLOCKS

STAGE 1 (info)

* JE Pistons
* Stock forged STi rods
* Brand new short block
* High performance rod & main bearings
* Precision AMS spec machine work on block & crank
* Precise, documented hand assembly

STAGE 2 (info)

* JE Pistons
* Manley H-beam Rods
* Brand new short block
* High performance rod & main bearings
* Precision AMS spec machine work on block & crank
* Precise, documented hand assembly

STAGE 3 (info)

* JE Pistons
* Manley I-beam Rods
* Billet crank
* Brand new sleeved short block
* High performance rod & main bearings
* Precision AMS spec machine work on block & crank
* Precise, documented hand assembly

Available Options

AMS can customize your stage 1 through 3 short block package with a number of options including JE Billet Pistons, full gasket sets, an 08 STI High Volume Oil Pump, Subaru water pump and gasket set, timing belt and tensioner, ARP head studs, and rod upgrades. Click on each stage above for available options.

AMS SUBARU STI EJ25 LONG BLOCKS

STAGE 1 (info)

* JE Pistons
* Manley H Beam Rods
* Brand new short block
* Cosworth Heads
* GSC Cams
* New OEM head gaskets
* High performance rod & main bearings
* ARP Head Studs
* Precision AMS spec machine work on block & crank
* Precise, documented hand assembly

STAGE 2 (info)

* JE Pistons
* Manley H Beam Rods
* Billet crank
* Cosworth Heads
* GSC Cams
* New OEM head gaskets
* High performance rod & main bearings
* ARP head studs
* Precision AMS spec machine work on block & crank
* Precise, documented hand assembly

STAGE 3 (info)

* JE Pistons
* Manley I Beam Rods
* Billet crank
* Sleeved block
* Cosworth Heads
* GSC Cams
* New OEM head gaskets
* High performance rod & main bearings
* ARP head studs
* Precision AMS spec machine work on block & crank
* Precise, documented hand assembly

Available Options

AMS can customize your stage 1 through 3 short block package with a number of options including JE Billet Pistons, full gasket sets, an 08 STI High Volume Oil Pump, Subaru water pump and gasket set, timing belt and tensioner, ARP head studs, and rod upgrades. Click on each stage above for available options.

The AMS Subaru STI Stage 1 long block is the ultimate solution for high horse power reliability. We use only the best off the shelf and custom designed AMS spec components. Combine that with the latest in machine and assembly practices and you are assured only the best!

All our engines are hand assembled at AMS using the same care as the engine in our 1142 awhp, world record holding AMS Drag EVO. Every motor is balanced, blueprinted and assembled to AMS’ exacting standards.

Before assembly each block is checked for correct dimensions, cylinder bore, mains, block flatness, etc… to ensure you get the best foundation for your new engine. Every engine we assemble has a build sheet where tolerances, torque specs, and clearances are documented.




  1. craig curtis
    March 3rd, 2010 at 10:17 | #1

    I am interested in buying an EJ25 Long block assembly to fit my 1997 Subaru Legacy Outback 5 spd wagon. How much would your stage I STI engine cost?

    Thank you

  2. bobby cain
    October 8th, 2010 at 12:54 | #2

    hey how much is all stage 1?

  3. JOE AMOROSO
    February 27th, 2011 at 12:25 | #3

    CAN YOU LET ME KNOW HOW MUCH YOUR EJ25 SHORT AND LONGBLOCKS ARE STAGE 1

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