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JE Pistons 257942 Forged Piston Set Bore Alloy Inverted Dome - 4.500 2618 8-Piece

Part of: JE Pistons Forged Piston Set Bore Alloy Inverted Dome

Other options in this family: JE Pistons 314438 JE Pistons 345814 JE Pistons 284780 JE Pistons 298728 JE Pistons 297051

Manufacturer

Picture for manufacturer JE Pistons

Part Number

257942
6 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 257942 forged piston set delivers race-proven performance for high-performance engine builds. Engineered from 2618 aluminum alloy for superior strength and heat resistance, this 8-piston set features an inverted dome/dish design with a 4.500-inch bore, 1.270-inch compression distance, and 0.990-inch pin diameter.

Key Features:

  • Application-specific forgings with optimized, uniform crown thickness for durability
  • Contact reduction groove minimizes frictional drag and improves efficiency
  • Accumulator groove increases top ring stability and sealing performance
  • CNC-machined side relief with lower support band for enhanced skirt strength
  • Honed pin bores with double pressure-fed pin oilers for superior lubrication
  • Oil rail support included for consistent ring tension
  • Wire locks included for secure pin retention

Sold as matched sets for balanced performance. JE Pistons has been the industry leader in forged racing pistons for over 60 years, trusted by professional engine builders worldwide. Recommended ring set: J100F8-4500-5 (sold separately).

Products specifications

Block Height

9.78

Bore (in)

4.500 in.

Bore (mm)

114.300mm

CID

540

Comp Height

1.27

Comp Ratio @ 110cc

8.8:1

Comp Ratio @ 118cc

8.4:1

Comp Ratio @ 124cc

8.1:1

Compression Distance (in)

1.270 in.

Dome Volume

-20

Gram Weight

569

Notes

Oil rail support included.

Pin Diameter (in)

0.990 in.

Piston Head Volume (cc)

+20.00cc

Piston Material

Forged aluminum

Piston Ring Thickness

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

Piston Style

Dish, with single valve relief

Quantity

Sold individually.

Rod

6.385

Stroke

4.25

Wrist Pin Style

Press-fit or floating

Add-On

J100F8-4500-5

Product Market

Domestic

Add-On

990-2930-18-51S

Compression Height

1.270

Add-On

990-042-CS

Piston Material

2618

Top Compression Ring Thickness

0.064

Forging Type

Round

Industry

Automotive

Piston Avg Wt

569

Piston Pin Length

2.930

Piston Volume

-20

Out of Stock Message

Call for Availability

Engine

BIG BLOCK CHEVY

Bore Diameter

4.500

Second Compression Ring Thickness

0.064

Piston Pin Material

5115

Piston Pin Wall Thickness

0.180

Piston Pin Outside Diameter

0.990

Oil Ring Thickness

0.218

Ringset Included

No

Cylinder Head

OPEN CHAMBER

Category Hierarchy

Pistons>Piston Kits

Piston Head Type

Dish

Make

Chevrolet

Piston Quantity

8

Prop 65

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

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