

RalliSpec EJ25 Short Block S1 (550bhp) - Street Spec Std
RELY ON RALLISPEC'S 25 YEARS OF SUBARU ENGINE BUILDING EXPERIENCE
The Street Spec Standard short block is our entry level fully built option. Designed to support up to 550bhp, this short block is spec'd with the weekend track warrior in mind yet will outlast the competition by far when driven mile after mile, year after year, on the street. Featuring Cosworth 4032 alloy pistons with a boxed and strutted forging design and low-tension quality Japanese ring package. You can expect minimal piston noise, blow-by, and oil consumption yet strength enough to support big power levels and motorsport type operating conditions. The pistons are supported by Saenz 4340 H-beam rods offering exceptional quality and reliability. No Chinese forging rods here!
Every short block is assembled by our master engine technician with 25 years of Subaru performance engine building experience in our dedicated engine room to exacting specifications. All relevant engine specifications are logged and a detailed blueprint sheet is provided.
Covered by a 1 year limited warranty.
SHORT BLOCK SPECS
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- Block Case - Semi-Closed Deck EJ257 RA
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Crankshaft - Salt-bath Nitride Hardened 79mm Stroke
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Head Stud Thread - OEM 11mm
- Pistons - Cosworth 4032 Forged 8.2CR (8.6 w/ D25 Heads)
- Pin Wall Thickness - 0.220in
- Connecting Rods - RalliSpec 4340 H-STD By Saenz
- Rod Bolts - ARP2000
- Bearings - Calico Coated ACL Tri-metal Rod / ACL Tri-metal Main
- Static Balance Tolerance - 1 gram
Fits the following:
- STI EJ257
- WRX EJ255
- EJ207/EJ205 w/ Cylinder Head Chamber Matching
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RalliSpec EJ25 Short Block S1 (550bhp) - Street Spec Std
If you have any questions, you are always welcome to contact us. We'll get back to you as soon as possible, within 24 hours on weekdays.
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