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JE Pistons 105040 Forged Flat Top Piston Set 4.040 Bore 8-Pack

Manufacturer

Picture for manufacturer JE Pistons

Part Number

105040
8 reviews
Sale Price

$1,043.99

Estimated ship date Sunday, November 15

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Product Details

The JE Pistons 105040 is a premium forged racing piston set engineered for high-performance small block Chevy applications. Manufactured from lightweight 2618 aluminum alloy, these pistons feature a 23-degree flat top design optimized for engines with 3.480 or 3.500 inch stroke. With a 4.040 inch bore, 1.250 inch compression distance, and 0.927 inch pin diameter, this made-to-order set delivers the precise specifications demanded by serious engine builders.

Key Features:

  • Application-specific forgings ensure optimized, uniform crown thickness for maximum strength and heat resistance
  • 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 with double pressure-fed pin oilers and wire locks included
  • Ultra-lightweight construction reduces reciprocating mass

This complete set includes 8 matched pistons for consistent performance across all cylinders. JE Pistons recommends using ring set J10008-4040-5 for optimal results. Backed by over 60 years of racing piston expertise, JE Pistons continues to be the trusted choice for Chevy, Ford, Mopar, and Buick performance builds.

Products specifications

Block Height

9

Bore

4.035

Bore (in)

4.040 in.

Bore (mm)

102.616mm

CID

359

Comp Height

1.245

Comp Ratio @ 58CC

11.6:1

Comp Ratio @ 64cc

10.8:1

Comp Ratio @ 76CC

9.4:1

Compression Distance (in)

1.250 in.

Dome Volume

-2

Gram Weight

387

Oversize

0.035

Pin Diameter (in)

0.927 in.

Piston Head Volume (cc)

+2.00cc

Piston Material

Forged aluminum

Piston Ring Thickness

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

Piston Style

Flat top, with two valve reliefs

Quantity

Sold individually.

Rod

6

Stroke

3.5

Wrist Pin Style

Press-fit or floating

Piston Pin Wall Thickness

0.130

Oil Ring Thickness

0.188

Out of Stock Message

Call for Availability

Product Market

Domestic

Piston Pin Outside Diameter

0.927

Add-On

927-042-CS

Piston Pin Material

5115

Compression Height

1.250

Add-On

927-2500-13-51S

Cylinder Head

STD CHEVROLET 23 DEG

Top Compression Ring Thickness

0.064

Engine

SMALL BLOCK CHEVROLET

Bore Diameter

4.040

Category Hierarchy

Pistons>Piston Kits

Piston Avg Wt

387

Ringset Included

No

Piston Pin Length

2.500

Industry

Automotive

Piston Head Type

Flat

Make

Chevrolet

Add-On

J10008-4040-5

Piston Material

2618

Forging Type

Round

Second Compression Ring Thickness

0.064

Piston Volume

-1.9

Prop 65

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

Wrist Pin Outer Diameter

0.927

Piston Quantity

8

This place was great. Great service they really helped mr out and were fast and extremely helpful.

So far so good

Incredibly low prices and fast shipping. I bought shocks and struts for my truck and saved more than 35% over what my local parts store wanted!!! I made the mistake of not setting up my account before placing my order so I didn't get confirmation right away, but one quick phone call fixed that. Great customer service.

thank guys didn't expect the shipment that quit,but any way thak a lot or the next order

Lowest price I could find. Cheap shipping for the size. Pretty happy

Very fast shipping and price is rite

Autoplicity had the lowest price(s) I could find on the individual item(s), and, even after shipping was added, my order still cost less than it would have at other places with "free shipping." It's also nice that you can use something like Google Checkout instead of having to create an account at Autoplicity to checkout...one less account/password to worry about keeping track of. My order was packed well, arrived safe and sound, and arrived well within the expected time frame.<br><br>Great prices, proper packing, and good turnaround...what more can you ask for?

I am impressed with they mail order service. Recommended.

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