Race Spec Value Shortblock

The completely redesigned Race Spec Value now features a closed deck block design to withstand extreme power levels. The top of the cylinders are reinforced with inserts precision machined from cast aluminum to exactly match the expansion coefficient of the base block material. The reinforcement prevents cylinder expansion, distortion and potential failure of the upper cylinder wall during extreme cylinder pressure conditions. The "pro" closed deck version features additional reinforcement of the block bolt access holes utilizing threaded inserts to partially close of the holes after block assembly.

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.

This short block is built uses Manley 2618 Extreme Duty Turbo Tuff Series pistons. The extreme duty pistons feature a heavy wall pin that reduces flex under extreme power outputs. We fit our Pro Series connecting rods in a 4340 material and ARP2000 rod bolts. The crankshaft spins in King XPG tri-metal bearings for optimum reliability. The block is precisely bored and finish honed with torque plates for straight and accurate cylinder dimensions. The cylinder crosshatch and piston ring end gap specifications ensure fast break-in and minimal blow-by conditions. The block decks are machined to correct any deck height errors and provide a surface finish for optimum head gasket sealing. The block is assembled with all necessary block hardware and oil separator plate.

Several optional upgrades are available to increase head gasket sealing. A 1/2" head stud package increases the head stud/bolt size from 11mm to 1/2" for additional clamping force. A 14mm head stud package further increases that dimension. The block is machined to accept the larger head studs. Additionally, you must send your cylinder heads to us so the bolt holes can be machined oversize as well. Each package includes the appropriate ARP oversized head studs.

Click here for shortblock comparison chart.

Usually ships in 3 to 4 weeks.

Manufacturer: RalliSpec

Applications:

• Subaru WRX STI MY15+
• Subaru Impreza STI MY01-14
• Subaru Impreza WRX MY06-14
• Subaru Legacy GT MY05-12
• Subaru Outback XT MY05-09
• Subaru Forester XT MY04-13