Manley Performance Platinum Series Piston Set

Chrysler 6.1L HEMI 90.9mm Bore +.020in Oversize Stroke 10.73:1 Compression Ratio

597680C-8

Overview:

The Manley Performance Platinum Series piston set is engineered specifically for Chrysler 6.1L HEMI engines requiring a 90.9mm bore with a +.020 inch oversize and a stock stroke configuration. Designed to deliver reliable, high-performance operation, these pistons are ideal for enthusiasts and professional engine builders seeking to enhance power and durability in their builds.

Built from premium 2618 alloy forgings, this piston set offers excellent strength and fatigue resistance, making it suitable for both street and performance applications. Whether you are upgrading your engine for spirited driving or preparing for more demanding conditions, these pistons provide the quality and precision needed to support increased horsepower and torque.

Key Features:

Manley’s Platinum Series pistons incorporate advanced materials and design features to ensure superior performance and longevity:

• Constructed from high-strength 2618 aluminum alloy forgings for enhanced durability under high stress.
• Proven cam and barrel skirt profiles reduce friction and wear, improving engine efficiency and longevity.
• Tool steel wrist pins provide superior strength and resistance to deformation.
• Moly skirt coatings on select part numbers reduce friction and improve piston-to-cylinder wall interaction.
• 10.73:1 compression ratio with a 5cc dome design optimizes combustion efficiency and power output.
• Precision machined for a +.020 inch oversize bore to ensure proper fitment and performance in rebuilt or bored engines.
• Compatible with stock stroke configurations, maintaining factory engine geometry for reliable operation.

Construction & Design

The pistons are meticulously crafted using 2618 alloy, known for its excellent strength-to-weight ratio and thermal stability, which is essential for high-performance and racing engines. The cam and barrel skirt profiles have been refined through extensive testing to minimize friction and wear, contributing to smoother engine operation and longer component life.

Each piston features a 5cc dome that achieves a 10.73:1 compression ratio, balancing power gains with engine reliability. The use of tool steel wrist pins ensures a robust connection between the piston and connecting rod, capable of withstanding high RPM and load conditions without failure.

Installation & Fitment

This piston set is designed as a direct replacement for Chrysler 6.1L HEMI engines with a 90.9mm bore and stock stroke. It is ideal for engine rebuilds or performance upgrades requiring a +.020 inch oversize bore. Proper machining and professional installation are recommended to ensure optimal fitment and performance.

• Fits Chrysler 6.1L HEMI engines with 90.9mm bore and stock stroke.
• Requires engine block boring to +.020 inch oversize.
• Compatible with factory components and standard assembly procedures.

What’s Included

• Complete set of forged 2618 alloy pistons with 5cc dome design.
• Tool steel wrist pins for each piston.
• Precision machined components ready for professional installation.

Ideal For:

• Performance enthusiasts upgrading Chrysler 6.1L HEMI engines.
• Professional engine builders seeking durable, high-quality pistons.
• Street and track applications requiring reliable power gains.
• Rebuilds involving +.020 inch oversize bore machining.

Manley Performance manufactures high-strength engine internals for serious builds—especially forged pistons, connecting rods, valves, and valvetrain components developed for racing and high-output street applications. If you’re building for boost, high compression, or sustained RPM, Manley is a common choice for parts engineered to take abuse and keep power reliable.