ROSS Racing Pistons (Subaru EJ20 and EJ257 DOHC) - Modern Automotive Performance

ROSS Racing Pistons (Subaru EJ20 and EJ257 DOHC)

Ross Racing Pistons
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  • Compression Ratio: Based on factory head and gasket
  • Ring Grooves: 99885 = 1.0,1.2,2.8 mm  99726 = 1.5,1.5,3 mm
  • Tech-Tip: Turbo applications include taper bore pins
  • What's Included: Rings, Locks, Pins (H13 non-tapered bore 52100 Bearing steel)
ENGINE CODE BORE RING GROOVES STROKE ROD LGTH HEAD CC C.H. COMP RATIO DOME VOLUME GRAM WT. PART NO.
EJ20 ( WRX ) 3.642 ( 92.5 mm ) 1.0, 1.2, 2.8 mm    2.952 5.135 45.0 1.275 8.5   -12.0 375 99885
EJ25 ( DOHC ) 3.937 ( 100 mm ) 1.5, 1.5, 3.0 mm    3.110 5.135 48.0 1.192 8.5   -22.5 387 99726

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