Description
Manley developed this Platinum Series piston configuration for Subaru EJ257 99.5 Bore 8.5:1; use the listed bore and compression details to match the piston to the finished cylinder and intended rotating assembly. The parent listing is distinguished by 8.5:1, which should be cross-checked against the rest of the engine combination.
Because this is a Subaru EJ257 99.5 Bore 8.5:1 piston family, final fitment depends on the machine shop’s finished cylinder measurement and the intended rod/stroke combination—not simply on nominal engine displacement.
Key Product Details
- Application: Subaru EJ257 99.5 Bore 8.5:1
- Manley Series: Platinum Series
- Title Specification: 8.5:1
- Product Family Detail: 2618-alloy forged piston construction
- Product Family Detail: tool-steel wrist-pin hardware on applicable part numbers
- Product Family Detail: moly skirt coating on applicable part numbers
- Manufacturer Part Numbers: Vary by selected configuration (2 SKUs in this parent family)
Available Configurations
This parent listing contains multiple selectable Manley SKUs. Choose the configuration that matches the measured engine or cylinder-head specification.
- Piston Grade: B, A
Package Quantity
Sold individually. This listing supplies one piston per selected SKU; order the quantity required for your engine and verify that all pistons match the machine shop’s bore/grade plan. This quantity applies to the selected Manley SKU family shown on this product page.
Selection & Fitment Notes
Verify bore finish, piston grade, pin size, rod compatibility, compression target, deck clearance, valve clearance, and ring requirements before final assembly.
Professional engine assembly and measurement are recommended. Product specifications should be confirmed against the selected Manley part number and the requirements of the exact engine build.