J.E. High Performance Pistons Forged & Rings for Subaru

J.E. PistonsHigh Performance

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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Subaru Forged Pistons & Rings

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

Enter your engine code in the search box at the top left to find the pistons & rings for that engine.

SUBARU 1997-2005 SUBARU IMPREZA , FORESTER, LEGACY EJ25

Dome/Dish requires no deburring or preparation
2618 T6 high tensile forged aluminum
JE designs are specifically engineered for extreme applications up. to, and including, professional competition. In this environment, the higher compression ratios, highest boost or heavy nitrous usage necessitate the higher tensile strength 2618 aluminum alloy.
Dome and dishes feature smooth flowing radii for excellent flame travel.
1.2 x 1.2 x 2.5mm ring widths.
.905 x 2.500 (Round Forging) and .905 x 2.250” (FSR Forging) straight wall carbon steel wrist pin provided.
Pin fitting and Tru-Arc locks included
Rings Now Included

SUBARU EJ25 DOHC 1997-1999 STD Bore: 99.5mm Deck Clearance is "0" Compression is calculated with .054" Head Gasket

Part #
Bore
Over
size
Stroke
(mm)
Rod
(mm)
C/D
(mm)
Head CC's
C/R
With
.040
Dome
CC's
Gram
Foot
note
Skirt
Included Ring Set#

314335 $916.37
99.5
STD
79
131.3
30.3
46
8.5
-24.4
Call
T, M
F
JG4904-3917 $157.11

314338 $916.37
99.5
STD
79
131.3
30.3
46
11.5
-1.0
Call
V, M
R
JG4904-3917 $157.11

314336 $916.37
99.75
0.25
79
131.3
30.3
46
8.5
-24.8
Call
T, M
F
JG4904-3927 $157.11

314339 $916.37
99.75
0.25
79
131.3
30.3
46
11.5
-1.3
Call
V, M
R
JG4904-3927 $157.11

314337 $916.37
100.0
0.50
79
131.3
30.3
46
8.5
-25.1
Call
T, M
F
JG4904-3937 $157.11

314340 $916.37
100.0
0.50
79
131.3
30.3
46
11.5
-1.5
Call
V, M
R
JG4904-3937 $157.11

Foot Note:
F FSR (Forged Side Relief)
G Stock Block Must Be Re-Sleeved
L Limited Availability
M Made To Order
N Must sleeve block
R Full Round Skirt
T Accepts Turbo and Nitrous
U Not Designed for use with Turbo or Nitrous
V Accepts Nitrous

SUBARU EJ25 SOHC 1999-2005 STD Bore: 99.5mm Deck Clearance is .015" Below Deck

Part #
Bore
Over
size
Stroke
(mm)
Rod
(mm)
C/D
(mm)
Head CC's
C/R
With
.040
Dome
CC's
Gram
Foot
note
Skirt
Included Ring Set#

314341 $916.37
99.5
STD
79
131.6
29.5
50
8.5:1
-20.4
390
T
F
JG4904-3917 $157.11

314344 $916.37
99.5
STD
79
131.6
29.5
50
11.5:1
3.0
408
V
R
JG4904-3917 $157.11

314342 $916.37
99.75
0.25
79
131.6
29.5
50
8.5:1
-20.8
393
T
F
JG4904-3927 $157.11

314345 $916.37
99.75
0.25
79
131.6
29.5
50
11.5:1
2.7
411
V
R
JG4904-3927 $157.11

314343 $916.37
100.0
0.50
79
131.6
29.5
50
8.5:1
-21.2
395
T
F
JG4904-3937 $157.11

314346 $916.37
100.0
0.50
79
131.6
29.5
50
11.5:1
2.5
415
V
R
JG4904-3937 $157.11

Foot Note:
F FSR (Forged Side Relief)
G Stock Block Must Be Re-Sleeved
L Limited Availability
M Made To Order
N Must sleeve block
R Full Round Skirt
T Accepts Turbo and Nitrous
U Not Designed for use with Turbo or Nitrous
V Accepts Nitrous

SUBARU 2004+ IMPREZA STI , 2005+ FORESTER XT, LEGACY GT, 2006+ WRX EJ257

Time Attack FSR Pistons now available!
2618 T6 high tensile forged aluminum
JE designs are specifically engineered for extreme applications up. to, and including, professional competition. In this environment, the higher compression ratios, highest boost or heavy nitrous usage necessitate the higher tensile strength 2618 aluminum alloy.
Dome and dishes feature smooth flowing radii for excellent flame travel.
1.2 x 1.2 x 2.5mm ring widths.
.905 x 2.250 straight wall carbon steel wrist pin provided.
Pin fitting and Tru Arc locks included
Rings Now Included

SUBARU EJ257 ULTRA SERIES ULTRA Series Includes: Grain Flow Optimized Forging Lateral Gas Ports
Ceramic Crown Coating Perfect Skirt Coating Accumulator Groove Double Pin Oiling Upgraded 9310 Pins and locks Carbon Steel Nitride Rings

Part #
Bore
Over
size
Stroke
(mm)
Rod
(mm)
C/D
(mm)
Head CC's
C/R
With
.040
Dome
CC's
Gram
Foot
note
Skirt
Included Ring Set#

361327 $1,132.12
99.50
STD
79
130.5
30.7
57
8.5:1
-16.5
425
ULTRA
F
JG4904-3917 $157.11

361330 $1,132.12
99.50
STD
79
130.5
30.7
57
9.5:1
-7.0
426
ULTRA
F
JG4904-3917 $157.11

361328 $1,132.12
99.75
0.25
79
130.5
30.7
57
8.5:1
-16.9
427
ULTRA
F
JG4904-3927 $157.11

361331 $1,132.12
99.75
0.25
79
130.5
30.7
57
9.5:1
-7.3
428
ULTRA
F
JG4904-3927 $157.11

361329 $1,132.12
100.00
0.50
79
130.5
30.7
57
8.5:1
-17.3
430
ULTRA
F
JG4904-3937 $157.11

361332 $1,132.12
100.00
0.50
79
130.5
30.7
57
9.5:1
-7.6
430
ULTRA
F
JG4904-3937 $157.11

Foot Note:
F FSR (Forged Side Relief)
G Stock Block Must Be Re-Sleeved
L Limited Availability
M Made To Order
N Must sleeve block
R Full Round Skirt
T Accepts Turbo and Nitrous
U Not Designed for use with Turbo or Nitrous
V Accepts Nitrous

SUBARU EJ257 TIME ATTACK "FSR" NOTE: Standard Stroke Series now compatible with either OEM or aftermarket rods!

Part #
Bore
Over
size
Stroke
(mm)
Rod
(mm)
C/D
(mm)
Head CC's
C/R
With
.040
Dome
CC's
Gram
Foot
note
Skirt
Included Ring Set#

291061 $916.37
99.5
STD
79
130.5
30.7
57.0
8.5:1
-16.5
407
T
F
JG4904-3917 $157.11

310936 $916.37
99.5
STD
79
130.5
30.7
57.0
9.5:1
-7.0
423
T,M
F
JG4904-3917 $157.11

296348 $916.37
99.75
0.25
79
130.5
30.7
57.0
8.5:1
-17.0
405
T
F
JG4904-3927 $157.11

310937 $916.37
99.75
0.25
79
130.5
30.7
57.0
9.5:1
-7.3
425
T
F
JG4904-3927 $157.11

291062 $916.37
100
0.50
79
130.5
30.7
57.0
8.5:1
-17.3
413
T
F
JG4904-3937 $157.11

310938 $916.37
100
0.50
79
130.5
30.7
57.0
9.5:1
-7.6
427
T,M
F
JG4904-3937 $157.11

Foot Note:
F FSR (Forged Side Relief)
G Stock Block Must Be Re-Sleeved
L Limited Availability
M Made To Order
N Must sleeve block
R Full Round Skirt
T Accepts Turbo and Nitrous
U Not Designed for use with Turbo or Nitrous
V Accepts Nitrous

SUBARU EJ257 TIME ATTACK "FSR" STROKER SERIES

NOTE: Stroker Pistons not compatible with OEM Rods. OEM Rods must be milled above pin end to clearn undercrown of piston.
Some Blocks may require clearancing for stroker applications.

Part #
Bore
Over
size
Stroke
(mm)
Rod
(mm)
C/D
(mm)
Head CC's
C/R
With
.040
Dome
CC's
Gram
Foot
note
Skirt
Included Ring Set#

291063 $916.37
99.5
STD
83
130.5
28.7
57
8.5:1
-20.7
398
T
F
JG4904-3917 $157.11

296352 $916.37
99.75
0.25
83
130.5
28.7
57
8.5:1
-21.1
401
T,M
F
JG4904-3927 $157.11

291064 $916.37
100.0
0.50
83
130.5
28.7
57
8.5:1
-21.5
404
T
F
JG4904-3937 $157.11

Foot Note:
F FSR (Forged Side Relief)
G Stock Block Must Be Re-Sleeved
L Limited Availability
M Made To Order
N Must sleeve block
R Full Round Skirt
T Accepts Turbo and Nitrous
U Not Designed for use with Turbo or Nitrous
V Accepts Nitrous

SUBARU BRZ FA20/4U-GSE 2012+

2618 T6 high tensile forged aluminum
JE designs are specifically engineered for extreme applications up. to, and including, professional competition. In this environment, the higher compression ratios, highest boost or heavy nitrous usage necessitate the higher tensile strength 2618 aluminum alloy.
Dome and dishes feature smooth flowing radii for excellent flame travel.
1.0 x 1.2 x 2.8mm ring widths.
.866 x 2.250 straight wall carbon steel wrist pin provided.
Pin fitting and wire locks included
Rings Now Included

SUBARU BRZ FA20/4U-GSE 2012+ Std Bore: 86mm

Part #
Bore
Over
size
Stroke
(mm)
Rod
(mm)
C/D
(mm)
Head CC's
C/R
With
.040
Dome
CC's
Gram
Foot
note
Skirt
Included Ring Set#

315114 $916.37
86.0
STD
86
129.3
32.75
39
9.5:1
-16.4
325
T
FSR
JG1004-3386 $146.84

315117 $916.37
86.0
STD
86
129.3
32.75
39
10.5:1
-10.2
312
T
FSR
JG1004-3386 $146.84

359152 $916.37
86.0
STD
86
129.3
32.75
39
12.5:1
-1.0
317
T
FSR
JG1004-3386 $146.84

315120 $916.37
86.0
STD
86
129.3
32.75
39
13.5:1
2.5
315
V
FSR
JG1004-3386 $146.84

359150 $916.37
86.25
0.25
86
129.3
32.75
39
9.5:1
-16.7
319
T
FSR
JG1004-3396 $146.84

359151 $916.37
86.25
0.25
86
129.3
32.75
39
10.5:1
-10.5
318
T
FSR
JG1004-3396 $146.84

359153 $916.37
86.25
0.25
86
129.3
32.75
39
12.5:1
-1.3
321
T
FSR
JG1004-3396 $146.84

359156 $916.37
86.25
0.25
86
129.3
32.75
39
13.5:1
2.2
317
V
FSR
JG1004-3396 $146.84

315115 $916.37
86.5
0.50
86
129.3
32.75
39
9.5:1
-17
321
T
FSR
JG1004-3405 $146.84

315118 $916.37
86.5
0.50
86
129.3
32.75
39
10.5:1
-10.7
318
T
FSR
JG1004-3405 $146.84

359154 $916.37
86.5
0.50
86
129.3
32.75
39
12.5:1
-1.5
322
T
FSR
JG1004-3405 $146.84

315121 $916.37
86.5
0.50
86
129.3
32.75
39
13.5:1
2.0
317
V
FSR
JG1004-3405 $146.84

315116 $916.37
87.0
1.00
86
129.3
32.75
39
9.5:1
-17.7
322
T,M
FSR
JG1004-3425 $146.84

315119 $916.37
87.0
1.00
86
129.3
32.75
39
10.5:1
-11.3
321
T,M
FSR
JG1004-3425 $146.84

359155 $916.37
87.0
1.00
86
129.3
32.75
39
12.5:1
-2.0
330
T
FSR
JG1004-3425 $146.84

315122 $916.37
87.0
1.00
86
129.3
32.75
39
13.5:1
1.6
322
V,M
FSR
JG1004-3425 $146.84

Foot Note:
F FSR (Forged Side Relief)
G Stock Block Must Be Re-Sleeved
L Limited Availability
M Made To Order
N Must sleeve block
R Full Round Skirt
T Accepts Turbo and Nitrous
U Not Designed for use with Turbo or Nitrous
V Accepts Nitrous

SUBARU EJ257 BLOCK WITH EJ20 HEAD "FSR"

New high strength FSR forging design! JE Pistons new FSR forgings are both strong and lightweight! The new FSR design has undergone extensive on-track testing to ensure flawless performance under the most demanding conditions.
2618 T6 high tensile forged aluminum
Specifically engineered for high horsepower Subaru engines.
Dome and dishes feature smooth flowing radii for excellent flame travel.
1.2 x 1.2 x 2.5mm ring widths.
.905 x 2.250 straight wall carbon steel wrist pin provided.
Pin fitting and Tru Arc locks included
JE Pro Seal Rings Included
Piston Profile Matches EJ20 Chamber Profile

SUBARU EJ257 BLOCK WITH EJ20 HEAD NOTE: NOW COMPATIBLE WITH EITHER
OEM OR AFTERMARKET RODS! **** Piston Profile Matches EJ20 Combustion Chamber. No Cylinder Head Mofications Necessary.

Part #
Bore
Over
size
Stroke
(mm)
Rod
(mm)
C/D
(mm)
Head CC's
C/R
With
.040
Dome
CC's
Gram
Foot
note
Skirt
Included Ring Set#

291059 $916.37
99.5
STD
79
130.5
30.7
48.0
8.5:1
-25.5
411
T
F
JG4904-3917 $157.11

325249 $916.37
99.5
STD
79
130.5
30.7
48.0
9.5:1
-16.4
411
T
F
JG4904-3917 $157.11

296349 $916.37
99.75
0.25
79
130.5
30.7
48.0
8.5:1
-26.0
413
T,M
F
JG4904-3927 $157.11

325250 $916.37
99.75
0.25
79
130.5
30.7
48.0
9.5:1
-16.7
414
T
F
JG4904-3927 $157.11

291060 $916.37
100.0
0.50
79
130.5
30.7
48.0
8.5:1
-26.4
416
T
F
JG4904-3937 $157.11

325251 $916.37
100.0
0.50
79
130.5
30.7
48.0
9.5:1
-17.0
416
T
F
JG4904-3937 $157.11

Foot Note:
F FSR (Forged Side Relief)
G Stock Block Must Be Re-Sleeved
L Limited Availability
M Made To Order
N Must sleeve block
R Full Round Skirt
T Accepts Turbo and Nitrous
U Not Designed for use with Turbo or Nitrous
V Accepts Nitrous

SUBARU 2002-2005 IMPREZA WRX EJ205

Dome/Dish requires no deburring or preparation
2618 T6 high tensile forged aluminum
JE designs are specifically engineered for extreme applications up. to, and including, professional competition. In this environment, the higher compression ratios, highest boost or heavy nitrous usage necessitate the higher tensile strength 2618 aluminum alloy.
Dome and dishes feature smooth flowing radii for excellent flame travel.
1.2 x 1.5 x 3.0mm & 1.0 x 1.2 x 2.8mm ring widths.
.905 x 2.250 straight wall carbon steel wrist pin provided.
Pin fitting and Tru Arc locks included
Rings Now Included

SUBARU EJ20 ULTRA SERIES ULTRA Series Includes: Grain Flow Optimized Forging Lateral Gas Ports Ceramic Crown Coating
Perfect Skirt Coating Accumulator Groove Double Pin Oiling Upgraded 9310 Pins and locks Carbon Steel Nitride Rings

Part #
Bore
Over
size
Stroke
(mm)
Rod
(mm)
C/D
(mm)
Head CC's
C/R
With
.040
Dome
CC's
Gram
Foot
note
Skirt
Included Ring Set#

361324 $1,132.12
92.0
STD
79
130.5
30.7
48
8.5:1
-14.6
361
ULTRA
F
JG1004-3622 $146.84

361325 $1,132.12
92.5
0.50
79
130.5
30.7
48
8.5:1
-15.3
363
ULTRA
F
JG1004-3642 $146.84

361326 $1,132.12
93.0
1.00
79
130.5
30.7
48
8.5:1
-16.0
365
ULTRA
F
JG1004-3661 $146.84

361318 $1,132.12
92.0
STD
75
130.5
32.7
48
8.5:1
-11.0
365
ULTRA
F
JG1004-3622 $146.84

361321 $1,132.12
92.0
STD
75
130.5
32.7
48
9.5:1
-3.2
388
ULTRA
F
JG1004-3622 $146.84

361319 $1,132.12
92.5
0.50
75
130.5
32.7
48
8.5:1
-11.7
367
ULTRA
F
JG1004-3642 $146.84

361322 $1,132.12
92.5
0.50
75
130.5
32.7
48
9.5:1
-3.8
390
ULTRA
F
JG1004-3642 $146.84

361320 $1,132.12
93.0
1.00
75
130.5
32.7
48
8.5:1
-12.4
369
ULTRA
F
JG1004-3661 $146.84

361323 $1,132.12
93.0
1.00
75
130.5
32.7
48
9.5:1
-4.4
392
ULTRA
F
JG1004-3661 $146.84

Foot Note:
F FSR (Forged Side Relief)
G Stock Block Must Be Re-Sleeved
L Limited Availability
M Made To Order
N Must sleeve block
R Full Round Skirt
T Accepts Turbo and Nitrous
U Not Designed for use with Turbo or Nitrous
V Accepts Nitrous

SUBARU 2002-2005 IMPREZA WRX EJ205 - ASYMMETRICAL Asymmetrical FSR Style Piston
Uses a 2.250" Long Pin Designed for 1.0 x 1.2 x 2.8mm Rings

Part #
Bore
Over
size
Stroke
(mm)
Rod
(mm)
C/D
(mm)
Head CC's
C/R
With
.040
Dome
CC's
Gram
Foot
note
Skirt
Included Ring Set#

314437 $916.37
92.0
STD
75
130.5
32.7
48.0
8.5:1
-11.0
Call
T
F
JG1004-3622 $146.84

314440 $916.37
92.0
STD
75
130.5
32.7
48.0
9.5:1
-3.2
Call
T
F
JG1004-3622 $146.84

314438 $916.37
92.5
0.50
75
130.5
32.7
48.0
8.5:1
-11.7
Call
T
F
JG1004-3642 $146.84

314441 $916.37
92.5
0.50
75
130.5
32.7
48.0
9.5:1
-3.8
Call
T
F
JG1004-3642 $146.84

314439 $916.37
93.0
1.00
75
130.5
32.7
48.0
8.5:1
-12.4
Call
T, M
F
JG1004-3661 $146.84

314442 $916.37
93.0
1.00
75
130.5
32.7
48.0
9.5:1
-4.4
Call
T,M
F
JG1004-3661 $146.84

Foot Note:
F FSR (Forged Side Relief)
G Stock Block Must Be Re-Sleeved
L Limited Availability
M Made To Order
N Must sleeve block
R Full Round Skirt
T Accepts Turbo and Nitrous
U Not Designed for use with Turbo or Nitrous
V Accepts Nitrous

SUBARU 2002-2005 IMPREZA WRX EJ205 - ASYMMETRICAL - STROKER SERIES
Asymmetrical FSR Style Piston Uses a 2.250" Long Pin Designed for 1.0 x 1.2 x 2.8mm Rings

Part #
Bore
Over
size
Stroke
(mm)
Rod
(mm)
C/D
(mm)
Head CC's
C/R
With
.040
Dome
CC's
Gram
Foot
note
Skirt
Included Ring Set#

314446 $916.37
92.0
STD
79
130.5
30.7
48
8.5:1
-14.6
Call
T,M
F
JG1004-3622 $146.84

314449 $916.37
92.0
STD
79
130.5
30.7
48
9.5:1
-6.4
Call
T,M
F
JG1004-3622 $146.84

314447 $916.37
92.5
0.50
79
130.5
30.7
48
8.5:1
-15.3
Call
T,M
F
JG1004-3642 $146.84

314450 $916.37
92.5
0.50
79
130.5
30.7
48
9.5:1
-7.0
Call
T,M
F
JG1004-3642 $146.84

314448 $916.37
93.0
1.00
79
130.5
30.7
48
8.5:1
-16.0
Call
T,M
F
JG1004-3661 $146.84

314451 $916.37
93.0
1.00
79
130.5
30.7
48
9.5:1
-7.5
Call
T,M
F
JG1004-3661 $146.84

Foot Note:
F FSR (Forged Side Relief)
G Stock Block Must Be Re-Sleeved
L Limited Availability
M Made To Order
N Must sleeve block
R Full Round Skirt
T Accepts Turbo and Nitrous
U Not Designed for use with Turbo or Nitrous
V Accepts Nitrous

SUBARU 2012+ DIRECT INJECTION TURBO FA20DIT / FA20E / FA20F

2618 T6 high tensile forged aluminum
JE designs are specifically engineered for extreme applications up. to, and including, professional competition. In this environment, the higher compression ratios, highest boost or heavy nitrous usage necessitate the higher tensile strength 2618 aluminum alloy.

Dome and dishes feature smooth flowing radii for excellent flame travel.
1.0 x 1.2 x 2.8mm ring widths.
.866 x 2.250 straight wall carbon steel wrist pin provided.
Pin fitting and wire locks included
Rings Now Included

SUBARU 2012+ DIRECT INJECTION TURBO FA20DIT ULTRA SERIES ULTRA Series Includes:
Grain Flow Optimized Forging Lateral Gas Ports Ceramic Crown Coating Perfect Skirt Coating Accumulator Groove Double Pin Oiling
Upgraded 9310 Pins and locks Carbon Steel Nitride Rings

Part #
Bore
Over
size
Stroke
(mm)
Rod
(mm)
C/D
(mm)
Head CC's
C/R
With
.040
Dome
CC's
Gram
Foot
note
Skirt
Included Ring Set#

361314 $1,132.12
86.00
STD
86
129.3
32.7
38.6
10.0:1
-13.2
328
ULTRA
F
JG1004-3386 $146.84

361315 $1,132.12
86.25
0.25
86
129.3
32.7
38.6
10.0:1
-13.5
328
ULTRA
F
JG1004-3396 $146.84

361316 $1,132.12
86.50
0.50
86
129.3
32.7
38.6
10.0:1
-13.8
330
ULTRA
F
JG1004-3405 $146.84

361317 $1,132.12
87.00
1.00
86
129.3
32.7
38.6
10.0:1
-14.4
334
ULTRA
F
JG1004-3425 $146.84

Foot Note:
F FSR (Forged Side Relief)
G Stock Block Must Be Re-Sleeved
L Limited Availability
M Made To Order
N Must sleeve block
R Full Round Skirt
T Accepts Turbo and Nitrous
U Not Designed for use with Turbo or Nitrous
V Accepts Nitrous

SUBARU 2012+ DIRECT INJECTION TURBO FA20DIT / FA20E / FA20F Std Bore: 86mm

Part #
Bore
Over
size
Stroke
(mm)
Rod
(mm)
C/D
(mm)
Head CC's
C/R
With
.040
Dome
CC's
Gram
Foot
note
Skirt
Included Ring Set#

359157 $916.37
86.0
STD
86
129.3
32.7
38.6
10.0:1
-13.2
323
T
FSR
JG1004-3386 $146.84

359188 $916.37
86.0
STD
86
129.3
32.7
38.6
10.6:1
-9.7
331
T
FSR
JG1004-3386 $146.84

359158 $916.37
86.25
0.25
86
129.3
32.7
38.6
10.0:1
-13.5
323
T
FSR
JG1004-3396 $146.84

359189 $916.37
86.25
0.25
86
129.3
32.7
38.6
10.6:1
-10.0
332
T
FSR
JG1004-3396 $146.84

359159 $916.37
86.5
0.50
86
129.3
32.7
38.6
10.0:1
-13.8
325
T, M
FSR
JG1004-3405 $146.84

359190 $916.37
86.5
0.50
86
129.3
32.7
38.6
10.6:1
-10.3
334
T, M
FSR
JG1004-3405 $146.84

359160 $916.37
87.0
1.00
86
129.3
32.7
38.6
10.0:1
-14.4
327
T, M
FSR
JG1004-3425 $146.84

359191 $916.37
87.0
1.00
86
129.3
32.7
38.6
10.6:1
-10.8
337
T, M
FSR
JG1004-3425 $146.84

Foot Note:
F FSR (Forged Side Relief)
G Stock Block Must Be Re-Sleeved
L Limited Availability
M Made To Order
N Must sleeve block
R Full Round Skirt
T Accepts Turbo and Nitrous
U Not Designed for use with Turbo or Nitrous
V Accepts Nitrous

SUBARU EJ257 BILLET FSR

JE Pistons is proud to release the first billet racing pistons for Subaru EJ257 engines! Originally created for the Crawford Performance Unlimited AWD Time Attack Subaru and Ken Block's Gymkhana racecar, these pistons are now available to the public. The new pistons are 100% CNC machined from high quality 2618-T6 wrought aluminum bar stock and are specifically designed for high horsepower road and drag race engines. The pistons feature internal and external bracing for improved durability and strength. A unique "donut dish" crown and application-specific under crown profile properly redistributes heat and reduces stress concentrations experienced in high horsepower Subaru engines. Unlike forged pistons, the billet pistons are machined on every surface allowing for all unnecessary weight to be removed during manufacturing. The result of this new process is a weight reduction of up. to 32 grams compared to other piston designs! High quality 9310 steel wrist pins and JE Pro Seal Rings are included. For severe racing applications, upgraded Diamond Like Carbon (DLC) coated wrist pins are available.

100% CNC machined billet piston
Specifically designed for high horsepower Subaru racing engines up. to 1200hp
Only 392 grams! up. to 32 grams lighter than other aftermarket pistons
Manufactured from high quality, certified 2618-T6 aluminum alloy
Internal and external strut braces
Premium 9310 steel wrist pins included (.905 x 2.250"), DLC upgrade available
JE Pro Seal Piston Rings Included (1.2, 1.2, 2.5mm)
Tru Arc locks for easy installation

SUBARU EJ257 BILLET FSR STD Bore: 99.5mm

Part #
Bore
Over
size
Stroke
(mm)
Rod
(mm)
C/D
(mm)
Head CC's
C/R
With
.040
Dome
CC's
Gram
Foot
note
Skirt
Included Ring Set#

310927 $1,878.33
99.5
STD
79
130.5
30.7
57
8.8:1
-14.1
NEW
T,M
FSR
JG4904-3917 $157.11

286463 $1,878.33
100.0
0.5
79
130.5
30.7
57
8.8:1
-15.1
392
T,M
FSR
JG4904-3937 $157.11

Foot Note:
F FSR (Forged Side Relief)
G Stock Block Must Be Re-Sleeved
L Limited Availability
M Made To Order
N Must sleeve block
R Full Round Skirt
T Accepts Turbo and Nitrous
U Not Designed for use with Turbo or Nitrous
V Accepts Nitrous

SUBARU LEGACY EJ22 TURBO 1991-1994

Dome/Dish requires no deburring or preparation
2618 T6 high tensile forged aluminum
JE designs are specifically engineered for extreme applications up. to, and including, professional competition. In this environment, the higher compression ratios, highest boost or heavy nitrous usage necessitate the higher tensile strength 2618 aluminum alloy.
Dome and dishes feature smooth flowing radii for excellent flame travel.
1.2 x 1.5 x 4.0mm ring widths.
.905 x 2.250 straight wall carbon steel wrist pin provided.
Pin fitting and Tru-Arc locks included
Rings Now Included

SUBARU LEGACY EJ22 TURBO 1991-1994 STD Bore: 97mm

Part #
Bore
Over
size
Stroke
(mm)
Rod
(mm)
C/D
(mm)
Head CC's
C/R
With
.040
Dome
CC's
Gram
Foot
note
Skirt
Included Ring Set#

314350 $916.37
97.00
STD
75
130.5
32.7
46.6
8.5
-14.7
Call
T, M
R
XH9700 $29.76

314351 $916.37
97.50
0.50
75
130.5
32.7
46.6
8.5
-15.4
421
T, M
R
XH9750 $29.76

314352 $916.37
98.00
1.00
75
130.5
32.7
46.6
8.5
-16
Call
T, M
R
XH9800 $29.76

Foot Note:
F FSR (Forged Side Relief)
G Stock Block Must Be Re-Sleeved
L Limited Availability
M Made To Order
N Must sleeve block
R Full Round Skirt
T Accepts Turbo and Nitrous
U Not Designed for use with Turbo or Nitrous
V Accepts Nitrous

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Part #	Bore	Over size	Stroke (mm)	Rod (mm)	C/D (mm)	Head CC's	C/R With .040	Dome CC's	Gram	Foot note	Skirt	Included Ring Set#
314335 $916.37	99.5	STD	79	131.3	30.3	46	8.5	-24.4	Call	T, M	F	JG4904-3917 $157.11
314338 $916.37	99.5	STD	79	131.3	30.3	46	11.5	-1.0	Call	V, M	R	JG4904-3917 $157.11
314336 $916.37	99.75	0.25	79	131.3	30.3	46	8.5	-24.8	Call	T, M	F	JG4904-3927 $157.11
314339 $916.37	99.75	0.25	79	131.3	30.3	46	11.5	-1.3	Call	V, M	R	JG4904-3927 $157.11
314337 $916.37	100.0	0.50	79	131.3	30.3	46	8.5	-25.1	Call	T, M	F	JG4904-3937 $157.11
314340 $916.37	100.0	0.50	79	131.3	30.3	46	11.5	-1.5	Call	V, M	R	JG4904-3937 $157.11