All Wiseco Pistons are sold with a ring set. Rings are available to order for rebuilding or refreshening of the engine.
Subaru | |||||||||||||||
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WRX EJ20 October 1998 and older | |||||||||||||||
Kit Part # | Bore mm/Inch | Over Sizes | Stroke | Rod Lgth. | Comp Ht. | Head cc's | Dome Dish | Gasket Thkness | Deck Clearance | Block Ht. | Comp. Ratio | Pin Dia. | Gram | Foot Notes | Ring # |
K576M925 | 92.50/3.642 | .020 | 2.952 / 75 | 5.137 / 130.5 | 1.312 / 33.32 | 49 | -17.8 | .054 / 1.37 | .012+ / 0.30+ | 7.913 / 201 | 7.8 | .9055 / 23mm | 350 | 1,2 | 9250TX |
K576M93 | 93.00/3.662 | .040 | 356 | 9300TX | |||||||||||
WRX October 1998 and newer | |||||||||||||||
Kit Part # | Bore mm/Inch | Over Sizes | Stroke | Rod Lgth. | Comp Ht. | Head cc's | Dome Dish | Gasket Thkness | Deck Clearance | Block Ht. | Comp. Ratio | Pin Dia. | Gram | Foot Notes | Ring # |
K588M92 | 92.00/3.622 | Std. | 2.952 / 75 | 5.137 / 130.5 | 1.286 / 32.66 | 48 | -9 | .054 / 1.37 | .014- / 0.35- | 7.913 / 201 | 8.35 | .9055 / 23mm | 375 | 1 | 9200TX |
K588M925 | 92.50/3.642 | .020 | 380 | 9250TX | |||||||||||
K588M93 | 93.00/3.662 | .040 | 385 | 9300TX | |||||||||||
WRX EJ20 Stroker Pre October 1998 (Sleeved blocks without access holes) (Rear Thrust - DOHC Crank) | |||||||||||||||
Kit Part # | Bore mm/Inch | Over Sizes | Stroke | Rod Lgth. | Comp Ht. | Head cc's | Dome Dish | Gasket Thkness | Deck Clearance | Block Ht. | Comp. Ratio | Pin Dia. | Gram | Foot Notes | Ring # |
K579M925 | 92.50/3.642 | .020 | 3.11 / 79 | 5.177 / 131.5 | 1.181 / 30 | 49 | -17.8 | .054 / 1.37 | 0 / 0 | 7.913 / 201 | 8.5 | .9055 / 23mm | 339 | 1,6 | 9250TX |
K579M93 | 93.00/3.662 | .040 | 348 | 9300TX | |||||||||||
Imprezza RS, Forrester and Legacy EJ25 SOHC | |||||||||||||||
Kit Part # | Bore mm/Inch | Over Sizes | Stroke | Rod Lgth. | Comp Ht. | Head cc's | Dome Dish | Gasket Thkness | Deck Clearance | Block Ht. | Comp. Ratio | Pin Dia. | Gram | Foot Notes | Ring # |
K600M995 | 99.50/3.917 | Std. | 3.11 / 79 | 5.181 / 131.6 | 1.161 / 29.5 | 50 | -18 | .054 / 1.37 | .016- / 0.4- | 7.913 / 201 | 8.5 | .9055 / 23mm | 366 | 1 | 9950VF |
K600M100 | 100/ 3.937 | .020 | 371 | 10000VF | |||||||||||
Imprezza RS, Forrester and Legacy EJ25 DOHC | |||||||||||||||
Kit Part # | Bore mm/Inch | Over Sizes | Stroke | Rod Lgth. | Comp Ht. | Head cc's | Dome Dish | Gasket Thkness | Deck Clearance | Block Ht. | Comp. Ratio | Pin Dia. | Gram | Foot Notes | Ring # |
K599M995 | 99.50/3.917 | Std. | 3.11 / 79 | 5.167 / 131.25 | 1.191 / 30.25 | 46.6 | -23 | .054 / 1.37 | 0 / 0 | 7.913 / 201 | 8.5 | .9055 / 23mm | 361 | 1 | 9950VF |
K599M100 | 100/3.937 | .020 | 366 | 10000VF | |||||||||||
WRX STI, 2004 and Up EJ257 | |||||||||||||||
Kit Part # | Bore mm/Inch | Over Sizes | Stroke | Rod Lgth. | Comp Ht. | Head cc's | Dome Dish | Gasket Thkness | Deck Clearance | Block Ht. | Comp. Ratio | Pin Dia. | Gram | Foot Notes | Ring # |
K598M995 | 99.50/3.917 | Std. | 3.11 / 79 | 5.137 / 130.5 | 1.209 / 30.7 | 51 | -19 | .021 / 0.5 | .012- / 0.30- | 7.913 / 201 | 8.9 | .9055 / 23mm | 371 | 1 | 9950VF |
K598M100 | 100/3.937 | .020 | 376 | 10000VF | |||||||||||
Legacy Turbo 1991-94 EJ22 (1996-98 Non Turbo 5.135 rod * 1999+ 5.165 rod) | |||||||||||||||
Kit Part # | Bore mm/Inch | Over Sizes | Stroke | Rod Lgth. | Comp Ht. | Head cc's | Dome Dish | Gasket Thkness | Deck Clearance | Block Ht. | Comp. Ratio | Pin Dia. | Gram | Foot Notes | Ring # |
K601M975 | 97.50/3.838 | .020 | 2.953 / 75 | 5.137 / 130.5 | 1.312 / 33.25 | 46.6 | -20 | .051 / 1.3 | .012+ / 0.30+ | 7.913 / 201 | 8.5 | .9055 / 23mm | 358 | 1,2 | 9750VF |
K601M98 | 98.00/3.858 | .040 | 366 | 9800VF | |||||||||||
Hybrid EJ22 with EJ25 DOHC Crank and Rods | |||||||||||||||
Kit Part # | Bore mm/Inch | Over Sizes | Stroke | Rod Lgth. | Comp Ht. | Head cc's | Dome Dish | Gasket Thkness | Deck Clearance | Block Ht. | Comp. Ratio | Pin Dia. | Gram | Foot Notes | Ring # |
K602M975 | 97.50/3.838 | .020 | 3.11 / 79 | 5.181 / 131.6 | 1.191 / 30.25 | 46.6 | -24 | .054 / 1.37 | .014+ / 0.35+ | 7.913 / 201 | 8.5 | .9055 / 23mm | 358 | 1,2 | 9750VF |
K602M98 | 98.00/3.858 | .040 | 366 | 9800VF | |||||||||||
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.