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The Manley Performance forged piston kit identified by manufacturer part number 612202C-4 is engineered for a measured performance-engine assembly. Final compatibility depends on the exact engine, mating components, and verified dimensions, not a similar product title alone.
Key Features
- Tool Steel Wrist Pins: Heavy-duty 21mm x 63mm pins with wire locks deliver secure rod connection and long-term durability.
- 2618 T6 Alloy Forgings: High-temperature aluminum alloy provides strength to withstand extreme boost pressures and RPMs in turbocharged EJ257 engines.
- Optimized Skirt Profiles: Proven cam and barrel skirt designs minimize friction, reduce wear, and ensure quiet operation under load.
- Compatible with stock EJ257 connecting rods (130mm length) and 79mm stroke crankshaft.
- Precision machining includes 30mm compression height for exact deck clearance.
- Moly Skirt Coating: Applied to select surfaces to prevent scuffing, galling, and cylinder wall damage during break-in and operation.
Fitment
| Fitment Status | Engine and build verification required |
|---|---|
| Required Verification | Exact engine code, dimensions, mating components, material, intended power level, and current Manley application listing |
Specifications
| Brand | Manley Performance |
|---|---|
| Manufacturer Part Number | 612202C-4 |
| Product Type | Forged Piston Kit |
| Fitment Type | Fitment Verification Required |
| Condition | New |
| Bore Diameter | 25 mm |
| Compression Ratio | 8.5:1 |
What's Included
One new Manley Performance forged piston kit in the exact quantity and configuration stated in the specifications. Bearings, rings, pins, locks, fasteners, and installation hardware are included only when expressly listed for this part number.
About Manley Performance
Manley Performance engineers connecting rods, pistons, crankshafts, valves, valvetrain components, and related hardware for professional street, racing, and forced-induction engine builds.
Related Manley Performance Products
- Shop all Manley Performance products
- Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.75mm +.25mm Bore 8.5:1 Dish Piston Set with Rings
- Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.75mm +.25mm Bore 9.8:1 Dish Piston Set with Rings
- Manley Subaru EJ257 100.25mm Bore +.75mm Over Size Bore 8.5:1 CR Dish Piston Set with Rings
Frequently Asked Questions
How do I verify the application for Manley 612202C-4?
Match the exact Manley part number and engine code, then confirm every listed dimension, material, mating component, clearance, and intended power level before ordering.
Are rings, pins, and locks included with this piston product?
Included hardware varies by exact part number. Confirm ring, wrist-pin, lock, coating, quantity, and upgraded-pin details in the current Manley package listing before machining.
What must the machine shop measure before assembly?
Verify finished bore, piston-to-wall clearance, ring end gaps, deck height, piston-to-valve clearance, wrist-pin fit, bearing clearances, and final compression ratio.
Installation Instructions
Use the current Manley instructions for part number 612202C-4 and the engine builder's measured assembly specifications. Verify material, orientation, machining, clearances, fastener procedure, lubrication, balance, torque or stretch values, and break-in before operation.
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