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Fi Performance

SS-800 EJ25 Short Block - Build a 800HP Subaru Engine

SS-800 EJ25 Short Block - Build a 800HP Subaru Engine

$5,500.00
$5,500.00
Sale Sold out
Shipping calculated at checkout.
FIP Modified oil pump

Key Features

  • JE Forged Pistons – 2618 Alloy, 8.5:1 Compression, upgraded .210” wall wrist pins

  • H-Beam Connecting Rods with ARP 2000 Hardware

  • High-Performance Coated Main & Rod Bearings

  • OEM Subaru 2.5L Case Halves
    (V3 Closed-Deck Conversion – Used, Seasoned & Machined)

  • OEM Subaru Nitrided 2017+ STI Crankshaft

  • Machined to Support 1/2” Head Studs

  • Professionally Blueprinted & Assembled at Fi Performance

Power & Application

  • Rated for up to 800 WHP

  • Designed for high-boost, high-RPM race applications

  • Built for strength, consistency, and long-term reliability under extreme conditions

Important Notes

This is a premium short block intended for serious performance builds. We strongly recommend pairing it with:

  • High-performance cylinder heads

  • Upgraded head studs

  • Properly matched fuel system and valvetrain components

Oil System Recommendation:
For applications exceeding 600 HP with an 8,000 RPM limiter, we strongly recommend our modified oil pump to ensure proper lubrication and maximum engine longevity.


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                Transform Your Subaru – Proven Performance at FI

                Unlock the true power of your Subaru with FI Performance. Our team of expert technicians doesn't just install parts – we meticulously build, tune, and refine high-performance machines. Our track record of dyno results and satisfied customers speaks for itself. Let us unleash the beast within your Subaru.