The Wiseco Professional Series forged racing pistons (MPN K398X1) are engineered for high-performance Chevy LS builds where durability is critical. Forged from high-strength 2618 aluminum in the USA, these pistons are designed to withstand the thermal and mechanical stresses of heavy to severe duty racing applications.

• Material: 2618 Forged Aluminum for superior tensile strength
• Bore Size: 4.010 inch
• Piston Volume: -3.2cc Flat Top (FT)
• ArmorGlide Skirt Coating: Reduces friction, minimizes wear, and provides quieter operation
• Precision ring grooves and anti-detonation groove for optimized ring seal
• Fully machined crown and forced pin oiling for improved reliability
• Includes premium piston rings for a complete installation

Fits select 2004-2020 Honda CRF450L/TRX450R, Infiniti G37, Kawasaki KFX450R, Nissan 370Z, and Yamaha YFZ450/R/X.

Wiseco 4-stroke piston ring sets are engineered to exact tolerances to ensure maximum compression, superior sealing, and consistent oil control. Designed specifically for use with Wiseco’s 4-stroke pistons, these rings undergo rigorous testing to meet the demands of high-performance racing and street applications. Choosing the correct ring set is critical to maintaining cylinder pressure and protecting your engine from blow-by and excessive oil consumption.

• Bore Size: 96.0mm
• Manufacturer Part Number: 9600XS
• Optimized for Wiseco Piston P/N: K643M96
• High-grade materials for improved heat dissipation and durability
• Precision-engineered for consistent ring tension and wall pressure

Vehicle Fitment:

Fits select 1948-2014 Acura, Chrysler, Dodge, Honda, Infiniti, Mitsubishi, Nissan, and Plymouth models.

This Wiseco 4-stroke piston ring set (MPN: 8900XX) is precision-engineered to provide a superior seal and maintain critical cylinder compression. Designed to meet the exact specifications of Wiseco's high-performance 4-stroke pistons, these rings offer optimized oil control and reduced friction for demanding racing and street applications. Developed and tested for race-ready performance, this set ensures the longevity and efficiency of your internal engine components.

• Bore Size: 89.00mm
• Type: 4-Stroke Piston Ring Set
• Designed for maximum sealing and oil control
• Compatible with Wiseco shelf-stock 4-stroke pistons
• Manufacturer Part Number: 8900XX

Fits 2004-2012 Subaru Impreza WRX STI, including Limited and Special Edition models (EJ257).

Engineered for high-output competition engines, the Wiseco Professional Series forged piston kit provides the durability required for serious EJ257 builds. These pistons are machined from 2618 aluminum alloy to provide superior tensile strength and resistance to detonation in high-boost applications. Each piston features Wiseco's proprietary ArmorGlide skirt coating to reduce friction, minimize noise, and prevent scuffing during extreme operating conditions.

• Bore Size: 99.75mm
• Volume: -19cc Dish (4v)
• Material: 2618 Forged Aluminum
• ArmorGlide Coating: Provides seizure resistance and quieter operation
• Forced Pin Oiling: Ensures consistent lubrication at the wrist pin for heavy-duty cycles
• Precision Features: Fully machined crowns and anti-detonation grooves for improved ring seal
• Manufacturer Part Number: K598M9975

This shelf-stock kit includes premium rings and is designed for builders who require high-performance tolerances and proven reliability in severe-duty racing environments.

This Wiseco 9310 series piston pin (S734) is engineered to withstand the extreme reciprocating forces inherent in high-performance engine builds. As the critical link between the connecting rod and the piston, the wrist pin must endure massive combustion loads while maintaining structural integrity. Wiseco utilizes 9310 steel alloy for this application, a material known for its exceptional core toughness and resistance to fatigue, making it a superior upgrade over standard 4130 alloy pins in high-horsepower or boosted environments.

• Manufacturer: Wiseco
• Part Number: S734
• Material: High-strength 9310 Steel
• Outside Diameter: 22mm
• Length: 50.8mm
• Wall Thickness: 10.57mm
• Precision ground for exact tolerances

This Wiseco SW 9310 series wrist pin is engineered to manage the extreme reciprocating forces within the engine bore, capable of handling high-load performance applications. Precision-manufactured from high-strength 9310 alloy steel, these pins provide the structural integrity and surface hardness required to prevent galling and deformation under stress.

Every Wiseco wrist pin is ground to exacting tolerances to ensure a proper fit between the piston and the connecting rod small end, maintaining oil film consistency and reducing friction. This specific pin is designed for builders requiring a 21mm diameter pin with a heavy-wall cross-section for maximum rigidity.

• Series: SW 9310
• Material: 9310 Alloy Steel
• Outside Diameter: 21mm
• Length: 50.8mm
• Wall Thickness: 9.57mm
• Manufacturer Part Number: S733

The Wiseco S718 SW Series Piston Pin is engineered to handle the extreme reciprocating loads found in high-performance internal combustion engines. As the critical connection point between the piston and the connecting rod, this wrist pin is designed to maintain dimensional stability and structural integrity under high-RPM and high-cylinder-pressure conditions.

This straight-wall (SW) design ensures consistent strength across the length of the pin, providing a reliable foundation for your rotating assembly. Precision-machined for exact fitment, it reduces friction and wear within the piston boss and rod bushing. For professional engine builders and enthusiasts alike, selecting the correct pin dimensions and wall thickness is vital for engine longevity.

• Manufacturer Part Number: S718
• Outside Diameter: .927 inch
• Length: 2.250 inch
• Wall Thickness: .527 inch
• Design: Straight Wall (SW)

Wiseco SW Turbo Series wrist pins are engineered to handle the extreme cylinder pressures common in forced induction and high-output racing engines. As the critical link between the piston and connecting rod, these pins are designed to reliably transfer over 11,000 pounds of force. This precision-ground S710 pin ensures a perfect fit and consistent oil film retention under heavy thermal and mechanical loads.

• Manufacturer Part Number: S710
• Series: SW Turbo
• Outside Diameter: 22mm
• Length: 2.500"
• Precision-ground for exacting tolerances and reduced friction
• Engineered for high-boost turbo and nitrous applications

Engineered for high-performance Chevrolet LT1 engines, these Wiseco RED (Race Engineered Design) Series forged pistons provide the strength and precision required for competitive drag racing and circle track applications. Each piston is forged and machined in the USA from 2618 aluminum alloy to handle the increased tensile stress of performance builds and power adders.

• Precision Engineered: Features a -.4cc DI dome design and 1.3260" compression height for optimized combustion and cylinder pressure management.
• Enhanced Lubrication: Horizontal slot oiling in the pin bores ensures consistent wrist pin and small-end lubrication for extended service life.
• Reduced Friction: Proprietary ArmorGlide skirt coating minimizes operating friction and noise while protecting against cylinder wall wear.
• Ring Seal Integrity: Includes an integrated accumulator groove to help maintain ring seal under high-load conditions.
• Complete Kit: Sold as a set of 8 and includes premium piston rings for a simplified installation process.
• MPN: RED0073X65

The Wiseco 99.75mm Piston Ring Compressor Sleeve is a precision engine building tool designed to facilitate the seamless installation of pistons into the engine block. Engineered with a smooth internal radius that tapers down to the specific 99.75mm bore size, this sleeve compresses piston rings evenly and gradually, significantly reducing the risk of ring breakage or damage during assembly—a critical factor when handling delicate high-performance oil ring sets.

Constructed for longevity in professional shop environments, the sleeve is hard-anodized and features a specialized Teflon coating. This combination provides a low-friction surface that allows the piston to slide into the cylinder with minimal resistance while ensuring the tool remains wear-resistant over hundreds of rebuilds.

• Bore Size: 99.75mm
• Material: Hard-anodized aluminum for superior durability
• Finish: Teflon-coated for low friction and smooth piston movement
• Design: Smooth internal radius taper ensures even ring compression
• Identification: Permanent laser-marked sizing for quick identification
• Manufacturer Part Number: RCST09975

The Wiseco RCS39040 Tapered Ring Compressor Sleeve provides a precision solution for installing pistons without damaging high-performance ring sets. Forged in-house in the USA, these sleeves feature a smooth internal radius that tapers down to the specific bore size, ensuring rings are compressed evenly and safely as they enter the cylinder block.

This sleeve is engineered for long-term durability in professional engine building environments. The hard-anodized finish is paired with a Teflon coating to minimize friction, preventing ring hang-ups and protecting delicate face coatings on oil rings and compression rings alike.

• Manufacturer Part Number: RCS39040
• Target Bore Size: 3.903in - 3.905in
• Construction: Forged aluminum, hard-anodized and Teflon coated
• Low-Friction Design: Smooth radius taper for even ring compression
• Identification: Laser-marked with size for quick bench recognition

Streamline your engine assembly and protect your piston rings with the Wiseco 3.800in Bore Ring Compressor Sleeve (RCS38000). Forged in-house in the USA, this precision-machined tool provides a superior alternative to generic adjustable band compressors, ensuring even compression across the entire ring circumference.

Each sleeve features a smooth internal radius that tapers down to the exact 3.800-inch bore size, allowing the piston and ring pack to slide into the cylinder without catching or snagging. This is particularly critical for the delicate, high-performance oil rings found in modern racing applications. The sleeve is hard-anodized and Teflon-coated to minimize friction and prevent surface wear over years of shop use.

• Bore Size: 3.800 inch
• Material: Forged aluminum construction
• Finish: Hard-anodized and Teflon-coated for low-friction operation
• Tapered design ensures smooth ring compression and installation
• Permanent laser-marked sizing for quick identification
• Manufacturer Part Number: RCS38000

Ensure a precise, damage-free engine assembly with the Wiseco RCS10000 piston ring compressor sleeve. Designed for professional engine builders, this tool simplifies the installation of high-performance oil rings and compression rings by providing a smooth, even transition into the cylinder bore.

Each sleeve is machined with a specific radius that tapers down to the exact 100.0mm bore size, preventing ring hang-ups or breakage during the piston installation process. The hard-anodized aluminum construction is finished with a Teflon coating to minimize friction and provide long-term wear resistance in a shop environment.

• Bore Size: 100.0mm
• Material: Hard-Anodized Aluminum
• Coating: Teflon-coated for low friction and smooth compression
• Design: Tapered bore with a smooth radius for easy ring entry
• Identification: Laser-marked with bore size for quick selection
• Manufacturer Part Number: RCS10000

The Wiseco RCS09950 Piston Ring Compressor Sleeve is a precision engine-building tool designed to ensure the safe and efficient installation of 99.5mm pistons. Unlike generic adjustable compressors, this fixed-diameter sleeve features a smooth internal radius that tapers down to the exact bore size, compressing rings evenly and preventing the breakage often associated with high-tension performance ring sets.

Constructed for professional use, the sleeve is hard-anodized and Teflon-coated to minimize friction and provide exceptional wear resistance. This combination allows the piston and ring assembly to slide into the cylinder block with minimal resistance, protecting both the ring landings and the cylinder walls from damage during assembly.

• Bore Size: 99.5mm
• Material: Hard-anodized aluminum for long-term durability
• Finish: Low-friction Teflon coating for smooth piston entry
• Design: Precisely tapered internal bore for even ring compression
• Identification: Laser-marked with size for quick tool identification
• Manufacturer Part Number: RCS09950

The Wiseco RCS09900 is a professional-grade 99mm piston ring compressor sleeve engineered to ensure precise, damage-free piston installation. Designed for high-performance engine assembly, this tool features a smooth internal radius that tapers down to the specific 99mm bore size, compressing rings evenly and smoothly as the piston passes through the sleeve into the cylinder block.

To handle the demands of frequent engine builds, Wiseco constructs these sleeves with a black hard-anodized finish and a Teflon coating. This combination significantly reduces friction and provides excellent wear resistance, preventing the scuffing of piston skirts or delicate ring faces. This dedicated sleeve is especially effective for installing high-tension oil rings which can be difficult to seat with universal tools.

• Specific Fitment: 99mm bore size
• Construction: Hard-anodized aluminum for durability
• Coating: Teflon-coated for low friction and smooth ring compression
• Design: Tapered bore with a smooth entry radius
• Identification: Laser-marked with size for quick verification
• Manufacturer Part Number: RCS09900

The Wiseco RCS09800 is a precision-engineered 98.0mm piston ring compressor sleeve designed to streamline engine assembly and protect critical components. This professional-grade tool features a smooth internal radius that tapers down to the exact bore size, ensuring piston rings are compressed evenly and smoothly as the piston is seated into the cylinder block.

• Specific Fitment: 98.0mm bore size
• Construction: Hard-anodized aluminum for maximum wear resistance
• Low-Friction Coating: Teflon-coated interior ensures smooth piston travel and prevents ring snagging
• Precision Taper: Smooth radial design eases the installation of high-performance oil rings
• Identification: Laser-marked with size indication for quick tool selection
• Manufacturer Part Number: RCS09800

By providing a consistent, 360-degree compression, this sleeve significantly reduces the risk of breaking rings or damaging the piston during high-performance engine rebuilds. It is an essential tool for technicians requiring repeatable accuracy and protection for delicate ring sets.

The Wiseco 97mm Bore Ring Compressor Sleeve (RCS09700) is a precision-engineered tool designed to streamline engine assembly and protect your high-performance piston rings during installation. This fixed-bore sleeve utilizes a smooth internal radius that tapers down to a precise 97mm diameter, ensuring rings are compressed evenly and safely to prevent damage or snagging on the cylinder deck.

• Low Friction Finish: Hard-anodized and Teflon-coated for superior wear resistance and a low-friction surface that prevents ring binding.
• Precision Taper: Smooth internal radius allows for effortless piston installation, particularly for fragile high-performance oil rings.
• Professional Grade: Durable construction designed for repeated use in high-performance engine rebuilds.
• Easy Identification: Laser-marked with the 97mm size for quick reference in the shop.
• Manufacturer Part Number: RCS09700

The Wiseco RCS09550 Tapered Piston Ring Compressor Sleeve is a precision tool engineered for engine builders who require a reliable, damage-free method for installing high-performance pistons into 95.50mm bores. Unlike generic band-style compressors, this fixed-diameter sleeve features a smooth internal radius that gradually and evenly compresses rings as the piston is pushed through, significantly reducing the risk of breaking or distorting thin oil rings.

• Precision Fit: Specifically machined for 95.50mm bore sizes to ensure perfect ring alignment.
• Low Friction Finish: Hard-anodized and Teflon-coated construction provides superior wear resistance and allows pistons to slide through with minimal resistance.
• Tapered Design: The smooth internal taper compresses rings smoothly without snagging or catching.
• Clear Identification: Laser-marked with the exact bore size for fast identification in professional shop environments.
• Manufacturer Part Number: RCS09550

The Wiseco RCS09500 is a precision-engineered 95.00mm tapered piston ring compressor sleeve designed for professional engine assembly. Unlike adjustable pliers-style tools, this sleeve features a fixed, machined taper with a smooth lead-in radius that compresses rings evenly and gradually as the piston moves through the bore. This design significantly reduces the risk of breaking or snagging high-performance oil rings during installation.

Built for durability and ease of use, each sleeve is manufactured from high-grade material with a hard-anodized finish and a Teflon coating. This combination ensures low-friction operation and superior wear resistance for repeated use. The sleeve is permanently laser-marked with the size for quick identification in the shop.

• Manufacturer Part Number: RCS09500
• Bore Diameter: 95.00mm
• Material: Hard-anodized aluminum
• Coating: Teflon-coated for low friction and surface protection
• Features: Smooth entry radius and tapered bore for precise ring compression
• Identification: Laser-marked size indication

Ensure a precise and damage-free engine assembly with the Wiseco 94.0mm Piston Ring Compressor Sleeve (MPN: RCS09400). Engineered for professional engine builders and performance enthusiasts, this sleeve features a precision-machined internal radius that tapers down to the exact 94.0mm bore size, allowing the piston and ring assembly to glide into the cylinder without snagging.

Built to withstand the rigors of frequent use, the sleeve is hard-anodized and Teflon-coated. This combination provides a low-friction surface that prevents ring damage and offers superior wear resistance over time. It is especially effective at safely compressing thin, high-performance oil rings that are easily damaged by traditional universal-style pliers or band compressors.

• Bore Size: 94.0mm
• Material: Hard-anodized aluminum with Teflon coating for low friction
• Tapered Design: Smooth internal radius for even ring compression
• Identification: Laser-marked with size for quick tool selection
• Compatibility: Engineered for specific 94.0mm bore applications
• Manufacturer Part Number: RCS09400

The Wiseco RCS09300 Piston Ring Compressor Sleeve is a professional-grade assembly tool designed to streamline your engine rebuild. Engineered with a smooth internal radius that tapers down to the precise 93.0mm bore size, this sleeve allows for the seamless installation of high-performance pistons and delicate oil rings without the risk of snagging or damage.

• Hard-anodized and Teflon-coated construction provides low friction and superior wear resistance for repeated shop use.
• Tapered design compresses rings smoothly and evenly into the cylinder bore.
• Greatly reduces the difficulty of seating high-tension high-performance ring sets.
• Laser-marked with the 93.0mm size indication for fast identification on the workbench.
• Manufacturer Part Number: RCS09300.

The Wiseco RCS09200 Piston Ring Compressor Sleeve is a professional-grade tool designed for engine builders who demand precision and reliability during the assembly process. Specifically engineered for a 92.0mm bore, this sleeve utilizes a smooth internal radius that tapers down to the exact bore size, ensuring piston rings are compressed evenly and safely into the cylinder block.

• Hard-anodized and Teflon coated for low friction, providing superior wear resistance and a smooth glide.
• Precision taper design eliminates the difficulty of installing high-performance oil rings.
• Ensures even ring compression to prevent damage to the ring lands or the rings themselves.
• Laser-marked with size identification for easy organization and quick identification in the shop.

Specifications:

• Bore Size: 92.0mm
• Material: Aluminum
• Finish: Black Hard-Anodized with Teflon Coating
• Manufacturer Part Number: RCS09200

Ensure a precise and damage-free piston installation with the Wiseco RCS09100 Tapered Ring Compressor Sleeve. Engineered for a 91.0mm bore, this specialty tool features a smooth internal radius that tapers down to the exact bore size, allowing for even compression of the piston rings as the assembly slides into the cylinder. This design significantly reduces the risk of breaking or snagging high-performance oil rings during a rebuild.

• Precision-machined with a 91.0mm bore diameter
• Hard-anodized and Teflon-coated for low friction and prolonged wear resistance
• Sleeves feature a smooth radius that tapers down to the specific bore size
• Greatly reduces difficulty of installing high-performance oil rings
• Compresses the piston rings smoothly and evenly to prevent ring breakage
• Laser-marked with size indication for easy identification in your toolbox
• Manufacturer Part Number: RCS09100

The Wiseco 90.5mm Bore Ring Compressor Sleeve (RCS09050) is a precision-engineered tool designed to streamline the engine assembly process. Unlike adjustable band-style compressors, this fixed-diameter sleeve ensures perfectly even compression of the piston rings for a seamless transition into the cylinder block, protecting both the rings and the piston skirts from damage.

Each sleeve is hard-anodized and Teflon-coated to provide a low-friction surface and exceptional wear resistance. The interior features a smooth radius that tapers down to the specific 90.5mm bore size, which is critical when installing thin, high-performance oil ring sets that are prone to catching on standard tools. For ease of use in a busy shop environment, the sleeve is laser-marked with the bore size for instant identification.

• Bore Size: 90.5mm
• Finish: Hard-anodized and Teflon-coated for low friction
• Design: Smooth radius taper for even ring compression
• Identification: Laser-marked size indication
• Manufacturer Part Number: RCS09050

The Wiseco RCS09000 is a precision-engineered engine assembly tool designed to ensure safe and efficient piston installation. This 90.0mm compressor sleeve features a smooth internal radius that tapers down to the exact bore size, compressing the rings evenly as the piston slides into the cylinder. This design significantly reduces the risk of breaking or distorting high-performance rings, particularly delicate multi-piece oil rings.

Engineered for professional shop use and performance engine builders, the sleeve is hard-anodized and Teflon-coated to provide a low-friction surface and excellent wear resistance. The laser-marked size indication ensures quick identification in a busy workspace, making it a reliable addition to any engine building toolkit.

• Specific Bore Size: 90.0mm
• Material: Hard-anodized aluminum for prolonged durability
• Finish: Teflon-coated for low friction and smooth ring compression
• Profile: Smooth radius taper for uniform ring seating
• Identification: Laser-etched size marking for easy shop visibility
• Manufacturer Part Number: RCS09000

Streamline your engine assembly and protect your investment with the Wiseco RCS08950 Piston Ring Compressor Sleeve. This precision-engineered tool is designed to compress piston rings smoothly and evenly, eliminating the risk of damage or breakage during installation. It features a smooth internal radius that tapers specifically to an 89.5mm bore, allowing the piston and ring assembly to slide into the cylinder with minimal resistance.

Built for the rigors of the machine shop and the home garage alike, the sleeve is hard-anodized and Teflon-coated. This combination significantly reduces friction and provides superior wear resistance for a long service life. The exterior is laser-marked with the bore size for quick identification in your toolbox.

• Bore Size: 89.5mm
• Material: Hard-anodized aluminum with Teflon coating
• Smooth radius taper for seamless ring compression
• Reduces difficulty when installing high-performance oil rings
• Manufacturer Part Number: RCS08950

Precision-engineered for professional engine assembly, the Wiseco RCS08850 Piston Ring Compressor Sleeve provides a smooth, reliable way to install pistons into an 88.5mm bore. Unlike adjustable pliers-style compressors, this fixed-diameter sleeve features a precise internal taper that ensures rings are compressed evenly and stay seated as the piston enters the cylinder, significantly reducing the risk of broken or misaligned rings.

Constructed from high-grade materials, the sleeve is hard-anodized and Teflon-coated to minimize friction and provide superior wear resistance. This low-friction surface is essential for protecting delicate high-performance oil rings during installation. The interior features a smooth radius that tapers exactly to the 88.5mm bore size for repeatable, damage-free results every time.

• Exact Fit: Designed specifically for 88.5mm bore sizes.
• Friction Reduction: Hard-anodized and Teflon-coated finish for smooth piston movement.
• Tapered Design: Smooth internal radius compresses rings evenly and prevents snagging.
• Clear Identification: Laser-marked with size indication for quick tool selection.
• MPN: RCS08850

Ensure a precise and damage-free engine assembly with the Wiseco RCS08800 Piston Ring Compressor Sleeve. This 88.0mm precision tool is engineered to simplify the installation of high-performance pistons and rings by providing a smooth, even compression that prevents ring breakage or cylinder wall scoring.

The sleeve features a precision-machined internal radius that tapers down to the exact 88.0mm bore size. This design allows the piston assembly to slide into the cylinder block with minimal resistance. To further enhance performance and durability, the sleeve is hard-anodized and Teflon coated, providing a low-friction surface and excellent wear resistance for repeated use in professional engine building environments.

• Bore Size: 88.0mm
• Finish: Hard-anodized black and Teflon coated for low friction
• Design: Tapered internal radius for smooth ring compression
• Construction: Heavy-duty material with laser-marked sizing for easy identification
• MPN: RCS08800

Ensure a precise and damage-free engine assembly with the Wiseco RCS08750 87.5mm Piston Ring Compressor Sleeve. Engineered for professional engine builders, this fixed-bore sleeve features a smooth internal radius that tapers down to the exact 87.5mm bore size. This design eliminates the struggle of installing high-performance oil rings and allows for smooth, even compression as the piston is seated into the cylinder block.

• Bore Size: 87.5mm
• Material: Hard-anodized aluminum with a Teflon coating for low friction and superior wear resistance
• Design: Smooth radius taper facilitates seamless ring entry without catching
• Identification: Laser-marked with size for quick identification in the shop
• Manufacturer Part Number: RCS08750

By using a dedicated sleeve rather than a generic adjustable pliers-style compressor, you maintain consistent pressure around the entire circumference of the ring pack, significantly reducing the risk of ring breakage or bore scuffing during the short-block assembly process.

The Wiseco RCS08650 Piston Ring Compressor Sleeve is a precision-engineered tool designed to facilitate the seamless installation of pistons and rings into an 86.5mm bore. Unlike universal pliers-style compressors, this dedicated sleeve features a smooth internal radius that tapers down to the exact bore size, ensuring rings are compressed evenly and securely without snagging.

• Precision Engineering: Specifically sized for 86.5mm bores to prevent ring damage during assembly.
• Low-Friction Finish: Hard-anodized aluminum construction with a Teflon coating for superior wear resistance and reduced friction.
• High-Performance Compatibility: Specialized taper design simplifies the installation of high-tension high-performance oil rings.
• Clear Identification: Each sleeve is laser-marked with the bore size for quick selection in professional shop environments.
• Part Number: RCS08650