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RalliSpec EJ25 Street Spec Series Shortblock
This short block utilizes all new components and is sold outright with no core exchange required. We start with an ultrasonically cleaned EJ257 block case from Subaru. The rotating assembly starts with a salt bath nitride hardened crankshaft running in ACL tri-metal race-series main bearings and coated Clevite or ACL rod bearings. The connecting rods are precisely machined for RalliSpec using American 4340 forgings and an extremely high strength H-beam design. FEA-evaluated design features around the large and small ends ensure high rigidity with the lowest weight. Rod bolts are ARP2000. Two piston options are available. Our standard option is a Cosworth piston featuring a highly rigid boxed-strut forging, proprietary Cosworth low-expansion alloy, and Xylan low-friction skirt coating.
Every short block is professionally assembled in our dedicted engine building room by our in-house builder who has over 20 years of motorsport level Subaru engine experience and has built hundreds of Subaru high performance engines. Every short block is blueprinted to carefully designed specifications that balance extended service life with extreme power capabilities. Every dimension is logged and a build spec sheet is provided for reference. The block is assembled with all typical short block hardware, plugs, and oil separator plate.
| Street Spec | Standard | Pro Value | Pro |
|---|---|---|---|
| Block Case Type | EJ25 Semi-Closed | EJ25 Semi-Closed | EJ25 Semi-Closed |
| Block Hardware | OEM | OEM | OEM |
| Fire Lock Groove | ✓ | ||
| Bore Size | 99.5mm | 99.75mm | 99.75mm |
| 79mm Nitrided Crankshaft | ✓ | ✓ | ✓ |
| Connecting Rods | 4340 H-STD | 4340 H-STD | 4340 PRO Tri-Beam |
| Rod Bolts | ARP2000 | ARP2000 | ARP L19 |
| Cosworth Pistons | ✓ | ✓ | ✓ |
| Piston Pins | 0.220in | 0.220in | 0.220in |
| Main Bearings | ACL | ACL | Coated ACL |
| Rod Bearings | Coated ACL | Coated Clevite | Coated Clevite |
| Head Stud Threads | 11mm | 11mm | 14 x 2.00mm |
| Balance Precision | 1g | 1/2g | 1/3g |
| Compression Ratio | 8.2 (8.6) | 8.2 (8.6) | 8.2 (8.6) |
| [NOTE] All shortblocks are built to order. Allow for build and shipping time. | |||
[ Excluded From Shipping Specials ]
[ Excluded From Shipping Specials ]
From $4,050.00
To $6,095.00
SKU
RalliSpec EJ25 Street Spec Series Shortblock
Whether race, rally, or road, RalliSpec Ltd. is dedicated to providing cutting edge solutions to your automotive performance needs. Since our inception in 1999 we have offered an unrivaled level of expertise and support to a growing list of clientele around the world. The technical partnerships we have forged with top level motorsports teams as well as our past in-house racing efforts have provided valuable insight. We pass this knowledge on to you so that the path to achieving your performance goals will be the most direct and cost effective one. While we have maintained a special focus on Subaru performance development, our experience is broad based and we are happy to assist with any high performance automotive project.
WARNING: Operating, servicing and maintaining a passenger vehicle or off-road vehicle can expose you to chemicals including engine exhaust, carbon monoxide, phthalates, and lead, which are known to the State of California to cause cancer and birth defects or other reproductive harm. To minimize exposure, avoid breathing exhaust, do not idle the engine except as necessary, service your vehicle in a well-ventilated area and wear gloves or wash your hands frequently when servicing your vehicle. For more information go to https://www.P65Warnings.ca.gov/passenger-vehicle.
| SKU | RalliSpec EJ25 Street Spec Series Shortblock |
|---|---|
| Brand | RalliSpec |