Manley Performance Subaru EJ257 99.75mm +0.25mm Bore Platinum Series Piston Set with Rings – High-Performance Forged Pistons

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.

• 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 EJ257 Platinum Series Piston Set offers professional-grade components designed for exceptional durability and performance in high-performance engines. Crafted from 2618 alloy forgings, these pistons provide superior strength and thermal stability, making them ideal for demanding tuning applications. The precision-designed cam and barrel (skirt) profiles optimize power output while minimizing wear on cylinder walls, ensuring longevity and efficiency.

Each piston features moly skirt coatings on select part numbers, reducing friction and enhancing durability under high-stress conditions. Chrome Moly wrist pins are standard, providing reliable connection between the piston and connecting rod. For increased durability, select SKUs offer upgraded wrist pins made from 9310 and Turbo Tuff/DLC alloys. Manley's unique fixturing process allows for simultaneous skirt turning and ring groove machining, ensuring precise ring land and groove dimensions for optimal sealing and power gains.

Designed with exacting standards, the pistons include carefully machined ring lands and grooves to promote better ring seal and combustion efficiency. This set is suitable for engines requiring a 99.75mm bore with a +0.25mm oversize, and is ideal for enthusiasts and professional tuners seeking reliable, high-performance pistons for forced induction or naturally aspirated builds. The set complies with Prop 65 regulations and is ready for installation in automotive applications, offering a robust solution for engine builders aiming for maximum performance and durability.

Features:

• 2618 alloy forged construction for superior strength and thermal stability

• Cam and barrel (skirt) profiles optimized for power and cylinder wall friendliness

• Moly skirt coatings on select part numbers to reduce friction and wear

• Chrome Moly wrist pins standard, with optional upgraded alloys for enhanced durability

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

• Precisely machined ring lands and grooves for improved ring seal and combustion efficiency

• Designed for 99.75mm bore with +0.25mm oversize, suitable for high-performance engines

• Meets Prop 65 standards for safety and compliance

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