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  • Subaru JE Pistons EJ257 BLOCK WITH EJ20 HEAD "FSR" - Piston Kit
subaru-je-pistons-ej257-block-with-ej20-head-fsr-piston-kit
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Subaru JE Pistons EJ257 BLOCK WITH EJ20 HEAD "FSR" - Piston Kit

Price: $724.30

Select Size:

  • Bore
  • Engine Compression Ratio (CR)
  • Volume Dome CC
  • 99.50mm = 3.917in 8.5:1 -25.5
  • 99.50mm = 3.917in 9.5:1 -16.4
  • 99.75mm = 3.927in 8.5:1 -26
  • 99.75mm = 3.927in 9.5:1 -16.7
  • 100.0mm = 3.937in 8.5:1 -26.4
  • 100.0mm = 3.937in 9.5:1 -17

Weight: 0.01 lb

Sku: 291059

Weight:

SKU:



$724.30

  • 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

 

 

Part # Bore Oversize Stroke
(mm)		 Rod
(mm)		 C/D
(mm)		 Head CCs C/R With .040 Dome CCs Gram Footnote Skirt Included
Ring Set#
291059 99.5 STD 79 130.5 30.7 48 8.5:1 -25.5 411 T F JG4904-3917
325249 99.5 STD 79 130.5 30.7 48 9.5:1 -16.4 411 T F JG4904-3917
296349 99.75 0.25 79 130.5 30.7 48 8.5:1 -26 413 T,M F JG4904-3927
325250 99.75 0.25 79 130.5 30.7 48 9.5:1 -16.7 414 T F JG4904-3927
291060 100 0.5 79 130.5 30.7 48 8.5:1 -26.4 416 T F JG4904-3937
325251 100 0.5 79 130.5 30.7 48 9.5:1 -17 416 T F JG4904-3937

 

 

 

Top Compression Ring Thickness 0.0480
Second Compression Ring Thickness 0.0480
Oil Ring Thickness 0.100
Forging Type FSR
Series JE Pistons
Piston Head Type Inv Dome/Dish
Pin Diameter (IN) 0.905
Make SUBARU
Wrist Pin Style - floating or press fit Floating
Wall Type STRAIGHT
Wall Thickness (IN) 0.180
Ringset Part Number JG4901-3917
Ring Brand ProSeal
Ringset Included Yes
Retainer Thickness 0.042
Retainer Lock Style Tru Arc Lock
Retainer Lock Part Number 905-042-CT
Retainer Diameter (IN) 0.905
Piston Pin Inside Diameter 0.545
Piston Material 2618
Piston Pin Length (IN) 2.250
Piston Avg Wt 405
Pin Offset Yes
Pin Brand JE Pistons
Pin Part Number 905-2250-18-51S
Pin Included Yes
Pin Diameter (mm) 23.00
Oil Rail Support Included No
Deck Clearance -0.012
Brand JE Pistons