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JE Pistons 258239 Forged Dome Piston Set Bore - 4.530 8-Cylinder

Part of: JE Pistons Forged Dome Piston Set Bore

Other options in this family: JE Pistons 353906 JE Pistons 186235 JE Pistons 359152 JE Pistons 361278 JE Pistons 182027

Manufacturer

Picture for manufacturer JE Pistons

Part Number

258239
7 reviews
Sale Price

$1,076.99

3 left at this price

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Usually delivered within 2 days

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Product Details

JE Pistons 258239 is a premium forged piston set engineered from 2618 aluminum alloy for high-performance and racing applications. This 8-piston set features a dome top design optimized for open chamber cylinder heads, delivering increased compression for maximum power output.

Key Specifications:

  • Bore diameter: 4.530 inches
  • Compression distance: 1.270 inches
  • Wrist pin diameter: 0.990 inches
  • 2618 aluminum alloy construction for superior strength and heat resistance
  • Dome top configuration for increased compression ratio
  • Includes heavy-duty 0.180-inch wall pins and wire locks
  • Oil rail support included for enhanced ring stability
  • Nitrous Dome Series design for nitrous oxide applications

Advanced Performance Features:

  • Application-specific forgings ensure optimized, uniform crown thickness
  • Contact reduction groove minimizes frictional drag for improved efficiency
  • Accumulator groove increases top ring stability and sealing
  • CNC-machined side relief with lower support band for additional skirt strength
  • Honed pin bores and double pressure-fed pin oilers for superior lubrication

JE Pistons are sold as matched sets to ensure proper balance and performance. Recommended ring set: J10008-4530-5. Backed by over 60 years of racing piston manufacturing expertise, JE Pistons continues to set the standard for forged racing pistons in Chevy, Ford, Mopar, and Buick engine 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

15.9:1

Comp Ratio @ 118cc

14.5:1

Comp Ratio @ 124cc

13.6:1

Compression Distance (in)

1.270 in.

Dome Volume

45

Gram Weight

657

Oversize

0.055

Pin Diameter (in)

0.990 in.

Piston Head Volume (cc)

-45.00cc

Piston Material

Forged aluminum

Piston Ring Thickness

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

Piston Style

Dome, with two valve reliefs

Quantity

Sold individually.

Rod

6.385

Stroke

4.25

Wrist Pin Style

Press-fit or floating

Piston Avg Wt

652

Piston Material

2618

Add-On

990-042-CS

Add-On

990-2930-18-51S

Category Hierarchy

Pistons>Piston Kits

Bore Diameter

4.530

Product Market

Domestic

Piston Pin Material

5115

Make

Chevrolet

Second Compression Ring Thickness

0.064

Forging Type

Round

Piston Volume

45

Cylinder Head

OPEN CHAMBER

Piston Pin Outside Diameter

0.990

Piston Head Type

Dome

Piston Pin Length

2.930

Oil Ring Thickness

0.218

Piston Pin Wall Thickness

0.180

Compression Height

1.270

Ringset Included

No

Engine

BIG BLOCK CHEVY

Out of Stock Message

Call for Availability

Industry

Automotive

Add-On

J10008-4530-5

Top Compression Ring Thickness

0.064

Piston Quantity

8

Prop 65

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

Ordering is easy waiting on shipment to check accurate item??

They had what I needed, No hassle ordering. and it shipped fast.

Great prices. Fast Shipping. I would definitely do business again.

I ordered online with autoplicity via google checkout. It was easy and a real good price compared to other sites. The communication was great every step of the way. Order confirmation, order tracking number and shipping number. Super fast shipping for a heavy item (springs)and was in perfect condition. I Will shop with them again.

Hands down the best price on the Magnaflow catback I have seen by more than 20%. They were able to work out the ship-from-manufacturer tracking after a quick phone call. Will definately be recommending these guys to others.

Great prices on the products I want. Quick shipping.

awesome price and super fast shipping. I will use again. Thanks

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