SKU OUT-SB-S1R-D
 
Outfront Motorsports Stage 1 RA shortblock is for that added Protection against ring land failure on a lightly modified car. These custom pistons are made specifically for use with the D25 cylinder heads found on the 06-14 WRX and other EJ255 applications.

This configuration includes:
Custom Outfront Motorsports spec EJ255 CP piston set (24cc) for D25 Heads
New OEM STI black Nitrited 2017+ crankshaft
New OEM STI connecting rods
King Performance Rod and main bearings
New OEM Case Bolts
All wrapped in a new OEM case.
Rear Covers, Rear Seal, and Pin Plugs Included!!!
This block is rated at 500 BHP