Wiseco Forged Pistons Subaru

RPM - RON'S PRECISION MACHINE, INC.
69 E. 580 N.
Santaquin, Utah 84655
1-801-754-5338 or Toll free 1-866-700-5877

Contact us anytime 24-7

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Call toll free to purchase at: 1-866-700-5877

Shelf-Stock Forged Pistons. Sold complete with pistons, rings, wrist pins and circlips. (piston kits)

  • ArmorGlide® SKIRT COATING INCREASES POWER AND REDUCES PISTON ROCK.
  • STRUTTED FORGING FOR IMPROVED STRENGTH
  • 2618 AEROSPACE ALLOY FOR SUPERIOR STRENGTH

Subaru
Subaru EJ20 2.0L 16V DOHC Impreza WRX
October 1998 and older

Wrist pin included: S805 $34.94 23mm -.905 x 2.500
 Kit Part #
 Your Cost

 
Bore
mm/Inch

Over
Size

Stroke

Rod Length

Comp.
Ht. 

Head
cc's

Volume 

Gasket
Thickness 

Deck
Clearance

 Block
Height

 Comp.
Ratio

 Ringset
(Included)

 Avg.
Wt

Foot-
Note
K576M925 $814.00 92.50 / 3.642 0.020 2.952
75mm
5.137
130.5mm
1.312
33.32mm
49cc

-17.8cc 
.054
1.37mm
+.012
+.30mm
7.913
201mm

7.8
9250TX $43.07 350

1, 2
K576M93 $814.00 93.00 / 3.662 0.040 9300TX $43.07 356


Subaru EJ20 79mm Stroker
Pre October 1998
(Sleeved blocks without access holes)
(Rear Thrust - DOHC Cran
k)
Wrist pin included: S805 $34.94 23mm -.905 x 2.500
 Kit Part #
 Your Cost

 
Bore
mm/Inch

Over
Size

Stroke

Rod Length

Comp.
Ht. 

Head
cc's

Volume 

Gasket
Thickness 

Deck
Clearance

 Block
Height

 Comp.
Ratio

 Ringset
(Included)

 Avg.
Wt

Foot-
Note
K579M925 $814.00 92.50 / 3.642 0.020 3.110
79mm
5.181
131.6mm
1.181
30mm
49cc -17.8cc .054
1.37mm
+.004
+.10mm
7.913
201mm

8.0
9250TX $43.07 350

1, 6
K579M93 $814.00 93.00 / 3.662 0.040 9300TX $43.07 356


Subaru EJ20 2.0L 16V Impreza WRX October
1998 and newer
Wrist pin included: S805 $34.94 23mm -.905 x 2.500
 Kit Part #
Your Cost

 
Bore
mm/Inch

Over
Size

Stroke

Rod Length

Comp.
Ht. 

Head
cc's

Volume 

Gasket
Thickness 

Deck
Clearance

 Block
Height

 Comp.
Ratio

 Ringset
(Included)

 Avg.
Wt

Foot-
Note
K588M92AP $943.60 92.00/ 3.622 Std. 2.952
75mm
5.137
130.5mm
1.286
32.66mm
48cc -9cc .054
1.37mm
.014
.35mm
7.913
201mm

8.2
9200TX $43.07 375

1
K588M925AP $943.60 92.50/ 3.642 0.020 9250TX $43.07 383
K588M93AP $943.60 93.00/ 3.662 0.040  9300TX $43.07  385


Subaru EJ22 2.2L 16V Legacy Turbo 1991-94
(1996-98 Non Turbo 5.135 rod * 1999+ 5.165 rod)
Wrist pin included: S805 $34.94 23mm -.905 x 2.500
 Kit Part #
 Your Cost

 
Bore
mm/Inch

Over
Size

Stroke

Rod Length

Comp.
Ht. 

Head
cc's

Volume 

Gasket
Thickness 

Deck
Clearance

 Block
Height

 Comp.
Ratio

 Ringset
(Included)

 Avg.
Wt

Foot-
Note
K601M975 $831.47 97.50 / 3.838 0.020 2.952
75mm
5.137
130.5mm
1.312
33.32mm
46.6cc -20cc .051
1.3mm
+.012
+.30mm
7.913
201mm

8.6
9750VF $33.60 358

1, 2
K601M98 $831.47 98.00 / 3.858 0.040 9800VF $33.60 366


Subaru EJ22 with 79mm • EJ25 DOHC Crank and Rods
Wrist pin included: S805 $34.94 23mm -.905 x 2.500
 Kit Part #
Your Cost

 
Bore
mm/Inch

Over
Size

Stroke

Rod Length

Comp.
Ht. 

Head
cc's

Volume 

Gasket
Thickness 

Deck
Clearance

 Block
Height

 Comp.
Ratio

 Ringset
(Included)

 Avg.
Wt

Foot-
Note
K602M975 $831.47 97.50 / 3.838 0.020 3.110
79mm
5.181
131.6mm
1.191
30.25mm
46.6cc -24cc .054
1.37mm
+.014
+.35mm
7.913
201mm

8.5
9750VF $33.60 358

1, 2
K602M98 $831.47 98.00 / 3.858 0.040 9800VF $33.60 366


Subaru EJ25 2.5L 16V SOHC
Impreza RS, Forester and Legacy
Wrist pin included: S805 $34.94 23mm -.905 x 2.500
 Kit Part #
Your Cost

 
Bore
mm/Inch

Over
Size

Stroke

Rod Length

Comp.
Ht. 

Head
cc's

Volume 

Gasket
Thickness 

Deck
Clearance

 Block
Height

 Comp.
Ratio

 Ringset
(Included)

 Avg.
Wt

Foot-
Note
K600M995 $831.47 99.50/ 3.917 Std. 3.110
79mm
5.181
131.6mm
1.161
29.5mm
50cc -18cc .054
1.37mm
.016
.40mm
7.913
201mm

8.5
9950VF $33.60 366

1
K600M9975 $831.47 99.75/ 3.927 0.010 9975VF $33.60 370
 K600M100 $831.47 100.0/ 3.937 0.020 10000VF $33.60 371








Subaru EJ25 2.5L 16V DOHC
Impreza RS, Forester and Legacy
Wrist pin included: S805 $34.94 23mm -.905 x 2.500

 Kit Part #
Your Cost

 
Bore
mm/Inch

Over
Size

Stroke

Rod Length

Comp.
Ht. 

Head
cc's

Volume 

Gasket
Thickness 

Deck
Clearance

 Block
Height

 Comp.
Ratio

 Ringset
(Included)

 Avg.
Wt

Foot-
Note
K599M995 $831.47 99.50/ 3.917 Std. 3.110
79mm
5.167
131.25mm
1.191
30.25mm
46.6cc -23cc .054
1.37mm

0
7.913
201mm

8.7
9950VF $33.60 361

1
K599M9975 $831.47 99.75/ 3.927 0.010 9975VF $33.60 367
K599M100 $831.47   100.0/ 3.937 0.020 10000VF $33.60 366


Subaru EJ257 2.5L 16V WRX STI, 2004 and Up $32.29
• 2006+ WRXEJ255
Wrist pin included: S805 $34.94 23mm -.905 x 2.500
 Kit Part #
Your Cost

 
Bore
mm/Inch

Over
Size

Stroke

Rod Length

Comp.
Ht. 

Head
cc's

Volume 

Gasket
Thickness 

Deck
Clearance

 Block
Height

 Comp.
Ratio

 Ringset
(Included)

 Avg.
Wt

Foot-
Note
K598M995AP $943.60 99.50/ 3.917 Std. 3.110
79mm
5.137
130.5mm
1.209
30.7mm
51cc -19cc

.021
.5mm
.012
.30mm
7.913
201mm

9.0
9950VF $33.60 379

1
K598M9975AP $943.60 99.75/ 3.927 0.010 9975VF $33.60 382
K598M100AP $943.60 100.0/ 3.937 0.020 10000VF $33.60 385

Optional K1 Rod for EJ18/20/22/25/257 Series: Part # 039DD21131 (5.137” / 130.5mm)
Optional K1 Rod for EJ25 Non Turbo Series: Part # 039DD21132 (5.181” / 131.6mm)
Part # 038ADD750 75mm Stroke
Part # 038ADD790 79mm Stroke
Part # 038ADD830 83mm Stroke (For Stroker Custom Pistons Only)
All have: 8-Bolt Flanges * EJ20/25 Main & Rod Journals * 21 lbs.

Foot Notes (far right column)
1 - Most Wiseco Pistons have offset pins. (Pins must be offset, same as OEM, for quietest operation).
2 - Due to compression height that may protrude above the deck, it is recommended that a
1.00mm thick head gasket is used.
3 - Optional pin upgrade available.
4 - Utilizes extra deep valve pockets to expand the range of I-Vtec with big cams and milled heads
6 - These pistons have an oil ring groove that is lower than OE. Will not work with sleeves
with access hole if the oil ring is not pinned in place.
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
* Some pistons are listed with a range of compression ratio's. The low number is determined w/ an un-cut deck and the higher number is determined w/ .030 piston to cylinder head clearance.
* Always check piston to valve clearance - If using VTEC or like mechanisms-check w/ longer duration higher lift lobe.
* Always run at least .030 piston to head clearance including gasket thickness.

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