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The JE Pistons forged piston set for Chevrolet small-block V8 engines with 23-degree cylinder heads gives your performance engine build a durable foundation for demanding use. The Tour Series combines forged 2618 aluminum construction with lateral gas ports, an accumulator groove, and double pin oilers. Its design brings JE's racing experience to a small-block rotating assembly, with crown geometry and ring grooves developed for the intended cylinder head and ring package. The round forging and application-specific machining provide a purposeful piston for a performance short block. This 4.040 in bore kit uses a 1.000 in compression height and is supplied as a matched set of eight pistons for your next V8 build.
| Specification | Details |
|---|---|
| Brand | JE Pistons |
| Piston Series | JE Pistons |
| Product Line | Tour Series Gas Ported |
| Manufacturer Part Number | 170696 |
| SKU | JEP170696 |
| UPC | 193564034625 |
| Application | Chevrolet small-block V8 engines with 23-degree cylinder heads |
| Piston Quantity | 8 |
| Package | Set of 8 pistons |
| Bore Diameter | 4.040 in |
| Bore Oversize | 0.040 in |
| Compression Height | 1.000 in |
| Crown Design | Flat Top |
| Crown Volume | -4.10 cc |
| Piston Alloy | 2618 forged aluminum |
| Forging Type | Round |
| Average Piston Weight | 374 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 | 358 cu in |
| Connecting Rod Length | 6.250 in |
| Engine Stroke | 3.500 in |
| Compatible Stroke Options | 3.480 in / 3.500 in |
| Block Height — Reference Build | 9.000 in |
| Ring Set Included | No |
| Recommended Ring Set | J70008-4040-5 |
| Add-On Part Number | 927-2500-15-51S |
| Top Compression Ring Thickness | 0.0436 in |
| Second Compression Ring Thickness | 0.0440 in |
| Oil Ring Thickness | 0.1490 in |
| Top Ring Groove Width | 0.04360 in |
| Second Ring Groove Width | 0.04400 in |
| Oil Ring Groove Width | 0.15000 in |
| Wrist Pin Material | 5115 Low Carbon Steel, Case Hardened |
| Wrist Pin Outer Diameter | 0.927 in |
| Wrist Pin Length | 2.500 in |
| Wrist Pin Wall Thickness | 0.150 in |
| Oil Rail Support Included | Yes |
| Intake Angle | 22.5° |
| Intake Diameter | 2.250 in |
| Intake Depth | 0.290 in |
| Exhaust Angle | 22.5° |
| Exhaust Diameter | 1.870 in |
| Compression Ratio — 64cc Head | 10.3:1 |
| Compression Ratio — 58cc Head | 11.2:1 |
| Compression Ratio — 76cc Head | 9.1:1 |
| Product Type | Engine Piston Kit |
| Engine Type | Internal combustion |
| 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 | Yes |
| Mill Undercrown | No |
| Pin Fit | Yes |
| 3D Undercrown Milling | No |
| Accumulator Groove | Yes |
| Anodized Top Ring Groove | No |
| 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 |
