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JE Pistons 257965 Forged Flat Top Piston Set Bore - 4.500 8-Pack

Manufacturer

Picture for manufacturer JE Pistons

Part Number

257965
10 reviews
Sale Price

$1,076.99

2 left at this price

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Usually delivered within 2 days

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Product Details

The JE Pistons 257965 forged piston set delivers professional-grade performance for high-performance engine builds. Precision-machined from 2618 aluminum alloy, this 8-piston set features a flat top design with a 4.500-inch bore, 1.270-inch compression distance, and 0.990-inch pin diameter for precise fitment and durability.

Key Features:

  • Application-specific forgings with optimized, uniform crown thickness for strength and heat management
  • Contact reduction groove minimizes frictional drag for improved efficiency
  • Accumulator groove increases top ring stability and sealing performance
  • CNC-machined side relief with lower support band provides additional skirt strength
  • Honed pin bores ensure precise pin fit and reduced wear
  • Double pressure-fed pin oilers deliver superior lubrication
  • Wire locks included for secure pin retention
  • Oil rail support included for enhanced ring support

Manufactured from 2618 forged aluminum alloy for exceptional strength and thermal stability under extreme conditions. Each set is precision-matched to ensure consistent compression and balance across all cylinders. Recommended ring set: J100F8-4500-5. Backed by JE Pistons' 60+ years of racing piston expertise.

Products specifications

Block Height

9.78

Bore

4.498

Bore (in)

4.500 in.

Bore (mm)

114.300mm

CID

540

Comp Height

1.27

Comp Ratio @ 110cc

10:1

Comp Ratio @ 118cc

9.4:1

Comp Ratio @ 124cc

9.1:1

Compression Distance (in)

1.270 in.

Dome Volume

-3

Gram Weight

617

Notes

Oil rail support included.

Pin Diameter (in)

0.990 in.

Piston Head Volume (cc)

+3.00cc

Piston Material

Forged aluminum

Piston Ring Thickness

1/16 in. x 1/16 in. x 3/16 in.

Piston Style

Flat top, with single valve relief

Quantity

Sold individually.

Rod

6.385

Stroke

4.25

Wrist Pin Style

Press-fit or floating

Forging Type

Round

Ringset Included

No

Oil Ring Thickness

0.218

Category Hierarchy

Pistons>Piston Kits

Piston Volume

-3

Piston Pin Wall Thickness

0.180

Compression Height

1.270

Piston Pin Outside Diameter

0.990

Add-On

990-042-CS

Make

Chevrolet

Second Compression Ring Thickness

0.064

Piston Pin Length

2.930

Piston Material

2618

Add-On

990-2930-18-51S

Piston Avg Wt

623

Industry

Automotive

Cylinder Head

OPEN CHAMBER

Product Market

Domestic

Piston Head Type

Flat

Bore Diameter

4.500

Add-On

J100F8-4500-5

Engine

BIG BLOCK CHEVY

Piston Pin Material

5115

Out of Stock Message

Call for Availability

Top Compression Ring Thickness

0.064

Prop 65

WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

Piston Quantity

8

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Excellent service and the cheapest price that I could find anywhere. Ordered on a Sunday and delivered in record time three days later...basic overground shipping. I will deffinately order from here again!

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Price was the lowest for the product that I wanted. That's including shipping price, which was still cheaper. Will definitely look into other products from them.

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