Speak with an Expert
Speak with an Expert
Free* Shipping on Orders Over $159
Easy 30 Days- No Hassle Returns
37,000+ 5 Star Reviews
MFG Fitment Guarantee
Couldn't load pickup availability
The JE Pistons forged piston set for Chevrolet small-block V8 engines with 23° cylinder heads brings durable 2618 aluminum construction to your performance build. The flat-top crown combines application-specific geometry with a round forging, carefully machined ring grooves, and precision wrist-pin bores. JE's performance piston engineering carries through the finished component, giving engine builders a purposeful option for the rotating assembly. With crown and pin dimensions developed around the intended engine combination, this set provides a durable foundation for a short block planned around its cylinder head, connecting rod, and stroke package. This 4.040 in bore version uses a 1.250 in compression height for its specified engine combination.
| Specification | Details |
|---|---|
| Brand | JE Pistons |
| Piston Series | JE Pistons |
| Manufacturer Part Number | 181918 |
| SKU | JEP181918 |
| UPC | 193564040237 |
| Application | Chevrolet small-block V8 engines with 23° cylinder heads |
| Piston Quantity | 8 |
| Package | Set of 8 pistons |
| Bore Diameter | 4.040 in |
| Bore Oversize | 0.040 in |
| Compression Height | 1.250 in |
| Crown Design | Flat Top |
| Crown Volume | -4.30 cc |
| Piston Alloy | 2618 forged aluminum |
| Forging Type | Round |
| Average Piston Weight | 406 g |
| Cylinder Head | Chevrolet 23° 20/30 |
| Engine Make | Chevrolet |
| Engine Architecture | Small Block |
| Engine Family | Small Block |
| Engine Detail | 23 Degree |
| Engine Displacement — Reference Build | 359 cu in |
| Connecting Rod Length | 6.000 in |
| Engine Stroke | 3.500 in |
| Compatible Stroke Options | 3.480 in / 3.500 in |
| Block Height — Reference Build | 9.000 in |
| Compression Reference Crown Volume | -5 cc |
| Ring Set Included | No |
| Recommended Ring Set | J10008-4040-5 |
| Add-On Part Number | J10008-4040-5 |
| Top Compression Ring Thickness | 0.0640 in |
| Second Compression Ring Thickness | 0.0640 in |
| Oil Ring Thickness | 0.1880 in |
| Top Ring Groove Width | 0.06400 in |
| Second Ring Groove Width | 0.06400 in |
| Oil Ring Groove Width | 0.18800 in |
| Wrist Pin Outer Diameter | 0.927 in |
| Wrist Pin Length | 2.500 in |
| Wrist Pin Material | 5115 Low Carbon Steel, Case Hardened |
| Wrist Pin Wall Thickness | 0.150 in |
| Intake Angle | 22.5° |
| Intake Diameter | 2.250 in |
| Intake Depth | 0.295 in |
| Exhaust Angle | 22.5° |
| Exhaust Diameter | 1.870 in |
| Compression Ratio — 58cc Head, Reference Build | 11.2:1 |
| Compression Ratio — 64cc Head, Reference Build | 10.3:1 |
| Compression Ratio — 76cc Head, Reference Build | 9.1:1 |
| 3D Undercrown Milling | No |
| Accumulator Groove | Yes |
| Anodized Top Ring Groove | No |
| Combo 2 | Yes |
| Contact Reduction | Yes |
| DVGP | No |
| Double Pin Oilers | Yes |
| EN Plating | No |
| Econo Undercrown Milling | No |
| Engine Type | Internal combustion |
| Gas Distribution | No |
| Lateral Gas Ports | No |
| Mill Undercrown | No |
| Pin Fit | Yes |
| Product Type | Engine Piston Kit |
| Skirt Coating | No |
| Smooth Crown Finish | No |
| Thermal Crown | No |
| Tuff Skirt | No |
| Ultra Dome | No |
| Ultra Groove | No |
| Ultra Groove Plus Gas Port | No |
| Vertical Gas Ports | No |
