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JE Pistons SUBARU STI EJ257 Block w/ EJ20 Head 99.75mm Bore CR 8.5 KIT Set of 4 Pistons 296349

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JE's Subaru FSR Hybrid 99.75mm piston set starts with 2618 T6 high tensile forged aluminum blanks. The pistons are specifically designed for high horsepower and profiled to match the EJ20 combustion chamber, which means no cylinder head modifications are required. The dome and dishes feature smooth flowing radii for excellent flame travel. The 8.5:1 JE's piston set includes .905 x 2.250 straight wall carbon steel wrist pins with Tru Arc locks along with a complete ring set. 

*The 79mm stroke Hybrid WRX FSR pistons are compatible with OEM or aftermarket rods! 

  • Bore: 99.75mm
  • Size: .25 Oversize
  • Stroke: 79mm
  • Rod: 130.5mm
  • C/D: 30.7mm
  • Head CC's: 48
  • C/R with .040: 8.5:1
  • Dome CC's: -26.0
  • Gram: 413
  • Footnote: Accepts Turbo / Nitrous / Made To Order
  • Skirt: F
  • Included Ring Set: JG4904-3927
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