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The JE Pistons forged piston set for Chevrolet small-block V8 engines with 23-degree heads brings durable 2618 aluminum construction to a demanding performance engine build. Each piston combines JE's application-specific crown design with carefully machined ring grooves and wrist-pin bores, giving engine builders a purposeful component for the rotating assembly. The round forging supports a design developed around the intended cylinder head and engine combination. JE's experience in performance piston engineering carries through the finished set, with dimensions that let the engine builder plan the short block around its rod, stroke, and crown configuration. This 4.155 in bore version uses a 1.125 in compression height for its specified engine combination.
| Specification | Details |
|---|---|
| Brand | JE Pistons |
| Piston Series | JE Pistons |
| Duty Class | Extreme Duty |
| Manufacturer Part Number | 170818 |
| SKU | JEP170818 |
| UPC | 193564003409 |
| Application | Chevrolet small-block V8 engines with 23-degree heads |
| Piston Quantity | 8 |
| Package | Set of 8 pistons |
| Bore Diameter | 4.155 in |
| Bore Oversize | 0.030 in |
| Compression Height | 1.125 in |
| Crown Design | Inverted Dome / Dish |
| Crown Volume | -26.80 cc |
| Piston Alloy | 2618 forged aluminum |
| Forging Type | Round |
| Average Piston Weight | 480 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 | 407 cu in |
| Connecting Rod Length | 6.000 in |
| Engine Stroke | 3.750 in |
| Block Height — Reference Build | 9.000 in |
| Ring Set Included | No |
| Recommended Ring Set | J10008-4155-5 |
| Add-On Part Number | J100F8-4155-5 |
| Top Compression Ring Thickness | 0.0640 in |
| Second Compression Ring Thickness | 0.0640 in |
| Oil Ring Thickness | 0.2180 in |
| Top Ring Groove Width | 0.06400 in |
| Second Ring Groove Width | 0.06400 in |
| Oil Ring Groove Width | 0.21800 in |
| Wrist Pin Outer Diameter | 0.927 in |
| Wrist Pin Length | 2.950 in |
| Wrist Pin Material | 5115 Low Carbon Steel, Case Hardened |
| Wrist Pin Wall Thickness | 0.150 in |
| Oil Rail Support Required | Yes |
| Oil Rail Support Included | Yes |
| Oil Rail Support Part Number | 4155-183 |
| Intake Angle | 20° |
| Intake Diameter | 2.250 in |
| Intake Depth | 0.260 in |
| Exhaust Angle | 20° |
| Exhaust Diameter | 2.250 in |
| Compression Ratio — 58cc Head, Reference Build | 9.7:1 |
| Compression Ratio — 64cc Head, Reference Build | 9.2:1 |
| Compression Ratio — 76cc Head, Reference Build | 8.6:1 |
| Product Type | Engine Piston Kit |
| Engine Type | Internal combustion |
| 3D Undercrown Milling | No |
| Accumulator Groove | Yes |
| Anodized Top Ring Groove | No |
| Combo 2 | Yes |
| Contact Reduction | Yes |
| Double Pin Oilers | Yes |
| DVGP | No |
| Econo Undercrown Milling | No |
| EN Plating | No |
| Gas Distribution | No |
| Lateral Gas Ports | No |
| Mill Undercrown | No |
| Pin Fit | Yes |
| Skirt Coating | No |
| Smooth Crown Finish | Yes |
| Thermal Crown | No |
| Tuff Skirt | No |
| Ultra Dome | No |
| Ultra Groove | No |
| Ultra Groove Plus Gas Port | No |
| Vertical Gas Ports | No |
