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JE Pistons FSR Tour Series GP Pistons
Piston, Forged, Flat Top, 2-Valve Reliefs, 4.030 in. Bore, 3.480 in. Stroke, 5.700 in. Rod, 1.550 in. Compression, Chevy, Left, Each
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Estimated Ship Date: Oct 27, 2026 Would you rather pick it up?
Overview
Brand:
Manufacturer's Part Number:
257797L
Part Type:
Product Line:
Summit Racing Part Number:
JEP-257797L
UPC:
193564211781
Piston Rings Included:
No
Bore (in.):
4.030 in.
Bore (mm):
102.362mm
Stroke:
3.500 in.
Engine Stroke Type:
Stock
Actual Engine Displacement:
5.9L/357
Rod Length:
5.700 in.
Piston Style:
Flat top, with two valve reliefs
Piston Material:
Forged aluminum
Compression Height (in.):
1.550 in.
Piston Head Volume (cc):
+4.10cc
Wrist Pin Style:
Press-fit or floating
Wrist Pin Retainers Included:
Yes
Wrist Pin Included:
Yes
Pin Diameter (in.):
0.927 in.
Piston Ring Thickness:
0.043 in. x 0.043 in. x 3.00mm
File Fit:
No
Gapless:
No
Top Ring Thickness:
0.043 in.
Second Ring Thickness:
0.043 in.
Oil Ring Thickness:
3.0mm
Remanufactured:
No
Quantity:
Sold individually.
Notes:
Designed to fit left exhaust valve orientation with 20/30 valve spacing. Also works with 3.480 in. stroke engines.
JE Pistons FSR Tour Series GP Pistons
JE Pistons FSR tour series GP pistons are a lightweight design specifically made for naturally aspirated Circle Track or drag race applications up to 650 hp. Their ring package has been raised for maximum efficiency. These pistons are an aggressive, competition-only design, not intended for street or nitrous use. Their ring grooves are precision-machined for .043, .043, 3.0mm rings and their valve reliefs will accommodate angle-milled aftermarket cylinder heads.
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