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The JE Pistons forged piston kit identified by manufacturer part number 138089 is designed to provide the piston geometry, material, and compression configuration for a specific performance-engine build. Final compatibility depends on the complete engine combination and measured dimensions, not the part title alone.
Key Features
- 4.030in Bore Diameter: Matches precision machined blocks for Chevy Small Block 350 to 383 cubic inch displacements.
- Forged 4032 Aluminum Construction: Delivers durability and resistance to high heat and stress in performance engines.
- 0.927in x 2.250in Wrist Pins: Full-floating chromoly design with 0.170in walls and spiro-locks for secure rod attachment.
- 1.425in Compression Height and -5.00cc Dish: Ensures correct deck clearance and compression ratio with 3.48in stroke and 5.7in rods.
- Designed for Chevrolet Small Block Gen I and II engines machined to 4.030in bore including 350 CID and 383 stroker with 1.425in compression height and 5.7in rods.
- Forged 4032 aluminum pistons with pre-installed 1/16in x 1/16in x 3/16in ring set and 0.927in chromoly wrist pins with spiro-locks.
Fitment
| Fitment Status | Engine and build verification required |
|---|---|
| Required Verification | Engine code, bore, stroke, rod length, pin size, cylinder head, compression target, and machine-shop measurements |
Specifications
| Brand | JE Pistons |
|---|---|
| Manufacturer Part Number | 138089 |
| Product Type | Forged Piston Kit |
| Fitment Type | Fitment Verification Required |
| Condition | New |
| GTIN | 00193564244451 |
| Piston Series | SRP |
| Cylinder Head | CHEVROLET 23 DEG 20/30 |
| Bore Diameter | 4.030 IN |
| Piston Head Type | Flat |
| Compression Height | 1.425 IN |
| Piston Volume | -5.00 CC |
| Piston Material | 4032 |
| Forging Type | FSR |
| Ring Set Included | No |
| Top Compression Ring Thickness | 1/16 IN |
| Second Compression Ring Thickness | 1/16 IN |
| Oil Ring Thickness | 3/16 IN |
| Wrist Pin Length | 2.750 IN |
| Wrist Pin Wall Thickness | 0.150 IN |
| Wrist Pin Material | 5115 Low Carbon Steel, Case Hardened |
What's Included
One new JE Pistons forged piston kit identified by manufacturer part number 138089 in the quantity and configuration stated by the official specifications. Rings, pins, locks, coatings, and installation components are included only when expressly listed for this exact part number.
About JE Pistons
JE Pistons engineers forged racing pistons, piston rings, wrist pins, locks, and related engine components for measured domestic, import, European, and professional motorsport builds.
Related JE Pistons Products
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Frequently Asked Questions
How do I verify the engine application for JE Pistons 138089?
Match the exact engine code and JE part number, then verify bore, stroke, rod length, pin size, cylinder head, compression target, and all machine-shop measurements.
Are piston rings included with this 4.030 IN JE piston kit?
The official JE specification lists Ring Set Included as No. Confirm pins, locks, quantity, and any upgraded pin option in the What's Included section before assembly.
What must the machine shop measure before final assembly?
Verify finished bore diameter, piston-to-wall clearance, ring end gaps, deck height, piston-to-valve clearance, pin fit, bearing clearances, and final compression ratio for the intended fuel, boost, and power level.
Installation Instructions
Use the current JE Pistons instructions for part number 138089 and the engine builder's measured assembly specifications. A qualified machine shop must verify bore finish, clearances, ring gaps, pin fit, lock installation, orientation, balance, deck height, valve clearance, compression ratio, lubrication, and break-in before operation.
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