My Account
My Garage
Shopping Cart

Shopping Cart

0 items in your Cart
View Cart
Subtotal
Track
My Order
MY GARAGE Select Vehicle
MY GARAGE

JE Pistons 257668 Forged Piston Set Bore Alloy - 4.390 2618 8-Cylinder

Part of: JE Pistons Forged Piston Set Bore Alloy

Other options in this family: JE Pistons 338094 JE Pistons 291062 JE Pistons 279946 JE Pistons 314303 JE Pistons 357429

Manufacturer

Picture for manufacturer JE Pistons

Part Number

257668
11 reviews
Sale Price

$1,016.99

Estimated ship date Wednesday, November 11

Check out with

ApplePay
Authorize Seller Badge
No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

JE Pistons 257668 is a premium forged piston set engineered from 2618 aluminum alloy for high-performance racing applications. This 8-piston set features a 4.390-inch bore diameter, 1.350-inch compression distance, and 0.990-inch pin diameter, designed for maximum strength and reliability under extreme conditions.

Key Features:

  • Application-specific forgings deliver optimized, uniform crown thickness for consistent performance
  • Contact reduction groove minimizes frictional drag and improves efficiency
  • Accumulator groove increases top ring stability and sealing for better compression
  • CNC-machined side relief with lower support band provides additional skirt strength
  • Honed pin bores ensure precise fit and reduced wear
  • Double pressure-fed pin oilers provide superior lubrication
  • Wire locks included for secure pin retention
  • JE ProSeal piston rings included with complete matched set

Backed by over 60 years of racing piston innovation, JE Pistons are sold as precision-matched sets to ensure balanced performance across all cylinders. The 2618 aluminum alloy construction offers exceptional strength-to-weight ratio and resistance to detonation, making this piston set ideal for forced induction and high-RPM applications.

Products specifications

Block Height

10.3

Bore

4.386

CID

520

Comp Height

1.35

Comp Ratio @ 72cc

9.8:1

Dome Volume

-39

Gram Weight

NEW!

Rod

6.8

Stroke

4.3

Add-On

990-042-CS

Product Market

Domestic

Industry

Automotive

Cylinder Head

M-6049-SCJ

Make

Ford

Out of Stock Message

Call for Availability

Top Compression Ring Thickness

0.064

Ringset Included

No

Add-On

J100F8-4390-5

Bore Diameter

4.390

Piston Pin Wall Thickness

0.150

Oil Ring Thickness

0.218

Piston Pin Length

2.930

Piston Avg Wt

582

Piston Pin Outside Diameter

0.990

Add-On

990-2930-15-51S

Category Hierarchy

Pistons>Piston Kits

Forging Type

Round

Compression Height

1.350

Second Compression Ring Thickness

0.064

Piston Volume

-39

Engine

BIG BLOCK FORD

Piston Material

2618

Piston Head Type

Dish

Piston Pin Material

5115

Prop 65

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

Piston Quantity

8

Wonderful and fast

Nice place to shop

Relatively easy. We'll see how fast and simple shipping and delivery ends up being.

excellent service !

Cool..

Excellent

They have the best prices and fast shipping too.

Best price I could find! Great customer service kept me informed through the whole order process to insure acuracy since it was being sent directly from the manufacture. Recieved my order in good time, right parts and no damage. Overall very satisfied and will be doing business again in the future.

Very competitive low prices and great product selection. Will definitely look to this vendor when purchasing automotive parts in the future.

Great prices and FAST shipping!! Definitely will buy products here again!

Although there was a mix up with the shipping on my order customer service was helpful and expedited the solution and made it worth my trouble. I will be keeping Autoplicity in mind for any other parts I might need for my Jeep.

Share icon
Return Policy
Returns are easy at THMotorsports

Not happy with a purchase? No problem. We've made returning items as easy as possible. And most purchases can be returned for free for 30 days. Learn more about our Returns Policy