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Wiseco Piston

Wiseco Piston Applications: Subaru

All Wiseco Pistons are sold with a ring set. Rings are available to order for rebuilding or refreshening of the engine.

Subaru
WRX EJ20 October 1998 and older
Kit Part #Bore mm/InchOver SizesStrokeRod Lgth.Comp Ht.Head cc'sDome DishGasket ThknessDeck ClearanceBlock Ht.Comp. RatioPin Dia.GramFoot NotesRing #
K576M92592.50/3.642.0202.952 / 755.137 / 130.51.312 / 33.3249-17.8.054 / 1.37.012+ / 0.30+7.913 / 2017.8.9055 / 23mm3501,29250TX
K576M9393.00/3.662.0403569300TX
WRX October 1998 and newer
Kit Part #Bore mm/InchOver SizesStrokeRod Lgth.Comp Ht.Head cc'sDome DishGasket ThknessDeck ClearanceBlock Ht.Comp. RatioPin Dia.GramFoot NotesRing #
K588M9292.00/3.622Std.2.952 / 755.137 / 130.51.286 / 32.6648-9.054 / 1.37.014- / 0.35-7.913 / 2018.35.9055 / 23mm37519200TX
K588M92592.50/3.642.0203809250TX
K588M9393.00/3.662.0403859300TX
WRX EJ20 Stroker Pre October 1998 (Sleeved blocks without access holes) (Rear Thrust - DOHC Crank)
Kit Part #Bore mm/InchOver SizesStrokeRod Lgth.Comp Ht.Head cc'sDome DishGasket ThknessDeck ClearanceBlock Ht.Comp. RatioPin Dia.GramFoot NotesRing #
K579M92592.50/3.642.0203.11 / 795.177 / 131.51.181 / 3049-17.8.054 / 1.370 / 07.913 / 2018.5.9055 / 23mm3391,69250TX
K579M9393.00/3.662.0403489300TX
Imprezza RS, Forrester and Legacy EJ25 SOHC
Kit Part #Bore mm/InchOver SizesStrokeRod Lgth.Comp Ht.Head cc'sDome DishGasket ThknessDeck ClearanceBlock Ht.Comp. RatioPin Dia.GramFoot NotesRing #
K600M99599.50/3.917Std.3.11 / 795.181 / 131.61.161 / 29.550-18.054 / 1.37.016- / 0.4-7.913 / 2018.5.9055 / 23mm36619950VF
K600M100100/ 3.937.02037110000VF
Imprezza RS, Forrester and Legacy EJ25 DOHC
Kit Part #Bore mm/InchOver SizesStrokeRod Lgth.Comp Ht.Head cc'sDome DishGasket ThknessDeck ClearanceBlock Ht.Comp. RatioPin Dia.GramFoot NotesRing #
K599M99599.50/3.917Std.3.11 / 795.167 / 131.251.191 / 30.2546.6-23.054 / 1.370 / 07.913 / 2018.5.9055 / 23mm36119950VF
K599M100100/3.937.02036610000VF
WRX STI, 2004 and Up EJ257
Kit Part #Bore mm/InchOver SizesStrokeRod Lgth.Comp Ht.Head cc'sDome DishGasket ThknessDeck ClearanceBlock Ht.Comp. RatioPin Dia.GramFoot NotesRing #
K598M99599.50/3.917Std.3.11 / 795.137 / 130.51.209 / 30.751-19.021 / 0.5.012- / 0.30-7.913 / 2018.9.9055 / 23mm37119950VF
K598M100100/3.937.02037610000VF
Legacy Turbo 1991-94 EJ22 (1996-98 Non Turbo 5.135 rod * 1999+ 5.165 rod)
Kit Part #Bore mm/InchOver SizesStrokeRod Lgth.Comp Ht.Head cc'sDome DishGasket ThknessDeck ClearanceBlock Ht.Comp. RatioPin Dia.GramFoot NotesRing #
K601M97597.50/3.838.0202.953 / 755.137 / 130.51.312 / 33.2546.6-20.051 / 1.3.012+ / 0.30+7.913 / 2018.5.9055 / 23mm3581,29750VF
K601M9898.00/3.858.0403669800VF
Hybrid EJ22 with EJ25 DOHC Crank and Rods
Kit Part #Bore mm/InchOver SizesStrokeRod Lgth.Comp Ht.Head cc'sDome DishGasket ThknessDeck ClearanceBlock Ht.Comp. RatioPin Dia.GramFoot NotesRing #
K602M97597.50/3.838.0203.11 / 795.181 / 131.61.191 / 30.2546.6-24.054 / 1.37.014+ / 0.35+7.913 / 2018.5.9055 / 23mm3581,29750VF
K602M9898.00/3.858.0403669800VF
Optional K1 Rod for EJ18 / 20 / 25 Series: Part # SH5137AJJB4-A
(Billet H-Beam 5.137 EJ20 S/4) Housing Bore 2.166" * Bolt 3/8" * Grams 568
Optional K1 Crank for EJ20 / 25 Dual Thrust Series:
Part # S750EJ20D 75mm Stroke
Part # S790EJ25D 79mm Stroke
Part # S830EJ25D 83mm Stroke
All have: 8-Bolt Flanges * EJ20 / 25 Main & Rod Journals * 21 lbs.

1. Most Wiseco pistons have offset pins. Pins must be offset same as o.e. for quitest operation - pin offset will be opposite of direction of engine rotation.

2. This piston is a flat top w/out valve pockets, to be used if verifying piston to valve and piston to head clearance.

6. Subaru piston for stroker application. Oil ring can drop into pin installation access hole, sleeved block w/ out access hole needed for best results.

  • Some pistons are listed with a range of compression ratio's. The low number is determined with an un-cut deck and the higher number is determined with .030 piston to cylinder head clearance.
  • Always check piston to valve clearance - If using VTEC or like mechanisms-check with longer duration higher lift lobe.
  • Always run at least .030 piston to head clearance including gasket thickness.
  • If piston appears to be different than expected, please do not hesitate to call Wiseco at 800-321-1364 to verify compatibility
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