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JE Pistons 257966 Forged Flat Top Piston Set Bore - 4.530 8-Piece

Manufacturer

Picture for manufacturer JE Pistons

Part Number

257966
5 reviews
Sale Price

$1,076.99

Estimated ship date Saturday, November 21

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Product Details

The JE Pistons 257966 is a premium forged piston set featuring application-specific 2618 aluminum alloy construction designed for high-performance and racing engines. This 8-piston set features a flat top design with a 4.530-inch bore diameter, 1.270-inch compression distance, and 0.990-inch pin diameter, making it ideal for custom big-bore engine builds.

Key Features:

  • Application-specific forgings ensure optimized, uniform crown thickness for maximum strength and heat dissipation
  • Contact reduction groove minimizes frictional drag for improved performance
  • Accumulator groove increases top ring stability and sealing under extreme conditions
  • CNC-machined side relief with lower support band provides additional skirt strength and reduced weight
  • Honed pin bores for precise fitment and reduced friction
  • Double pressure-fed pin oilers ensure proper lubrication
  • Wire locks included for secure pin retention
  • Oil rail support included for enhanced ring stability

JE Pistons are precision-manufactured and sold as matched sets to ensure balanced performance. Recommended ring set: J100F8-4530-5. With over 60 years of racing piston innovation, JE Pistons remains the trusted choice for serious engine builders working with Chevy, Ford, Mopar, and Buick performance applications.

Products specifications

Block Height

9.78

Bore (in)

4.530 in.

Bore (mm)

115.062mm

CID

548

Comp Height

1.27

Comp Ratio @ 110cc

10.1:1

Comp Ratio @ 118cc

9.6:1

Comp Ratio @ 124cc

9.2:1

Compression Distance (in)

1.270 in.

Dome Volume

-3

Gram Weight

626

Notes

Oil rail support included.

Oversize

0.055

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

Compression Height

1.270

Make

Chevrolet

Piston Material

2618

Add-On

990-2930-18-51S

Add-On

J100F8-4530-5

Piston Volume

-3

Piston Pin Material

5115

Top Compression Ring Thickness

0.064

Ringset Included

No

Out of Stock Message

Call for Availability

Forging Type

Round

Category Hierarchy

Pistons>Piston Kits

Industry

Automotive

Piston Avg Wt

627

Product Market

Domestic

Piston Head Type

Flat

Cylinder Head

OPEN CHAMBER

Second Compression Ring Thickness

0.064

Oil Ring Thickness

0.218

Piston Pin Length

2.930

Add-On

990-042-CS

Engine

BIG BLOCK CHEVY

Piston Pin Outside Diameter

0.990

Piston Pin Wall Thickness

0.180

Bore Diameter

4.530

Prop 65

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

Piston Quantity

8

Great place to shop, low prices and ease of website to browse!

Great product at the lowest price on he web. Fast shipping as well. Will be doing business with again. - Adam

I would definetly order from Autoplicity again. Fast curtious service they had just what I wanted and the prices were the best I could find.

Lowest prices and fast shipping made this a great transaction.

PART CAME IN FAST!!! Can't wait to tear it open

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