Manley Performance Subaru WRX/STI EH257 99.5mm Bore Extreme Duty Piston Set - Standard Size 8.5:1 Compression

Our signature "Platinum Series" pistons feature 2618 alloy forgings, proven cam and barrel skirt profiles, tool steel wrist pins, and moly skirt coatings on select part numbers. Join the ranks of professional engine builders and tuners who rely on Manley pistons for superior performance and durability. Manley Piston Set, PIST-SUBARU 99.5mm/GRADE B T/T.

• Chrome Moly Wrist Pins: Premium Chrome Moly wrist pins come standard with our Standard Series Pistons. For select SKUs, we offer wrist pin upgrades to 9310 and Turbo Tuff/DLC alloys, providing additional durability.
• Unique Fixturing: Manley's unique fixturing allows for skirt turning and ring groove machining in a single operation, ensuring ultimate ring groove to skirt squareness.
• Exacting Ring Lands and Grooves: We adhere to strict standards for piston ring lands and grooves, resulting in enhanced ring seal and more power.
• Cam and Barrel Profiles: Our pistons boast cam and barrel (skirt) profiles that generate substantial power while being gentle on cylinder walls.
• 2618 Alloy Forgings: We use domestic 2618 alloy forgings, ensuring superior strength and performance.

The Manley Performance Subaru WRX/STI EH257 piston set is engineered for high-performance applications, featuring premium 2618 alloy forgings that deliver exceptional strength and durability. Designed to meet the demands of professional engine builders and tuners, these pistons incorporate proven cam and barrel skirt profiles that optimize power output while minimizing wear on cylinder walls. The inclusion of moly skirt coatings on select part numbers further enhances wear resistance, ensuring long-lasting performance under rigorous conditions. This piston set is ideal for those seeking reliable, high-quality components to support aggressive tuning and high horsepower builds.

Each piston is equipped with chrome moly wrist pins as standard, providing a robust connection between the piston and connecting rod. For enhanced durability, certain models offer upgraded wrist pins made from 9310 or Turbo Tuff/DLC alloys, catering to extreme performance needs. Manley's unique fixturing technique allows for precise skirt turning and ring groove machining in a single operation, ensuring the critical relationship between ring land and skirt is maintained for optimal sealing and power development. The pistons feature meticulously crafted ring lands and grooves that adhere to strict standards, promoting superior ring seal and increased compression.

The cam and barrel profiles are engineered to generate substantial power while being gentle on the cylinder walls, contributing to both performance and longevity. Constructed with domestic 2618 alloy forgings, these pistons provide superior strength, heat resistance, and reliability necessary for high-stress engine environments. Whether you’re building a race engine or upgrading your Subaru for spirited street driving, the Manley EH257 piston set offers a combination of advanced design and durable materials tailored for demanding applications.

Features:

• 2618 alloy forgings for superior strength and performance

• Proven cam and barrel skirt profiles optimized for power and durability

• Chrome moly wrist pins included as standard, with optional upgrades to 9310 and Turbo Tuff/DLC alloys

• Unique fixturing allows for precise skirt turning and ring groove machining in a single operation

• Exacting ring lands and grooves for enhanced ring seal and increased compression

Air Freight Prohibited: false
Not Carb Approved: true
Carb Acknowledgement Required: true
Ltl Freight Required: false
Prop 65: Y
Part Type: automotive
Epa: N/A
Regular Stock: t
Units Per Sku: 1