Wiseco 4102FSX Forged Flat-Top Piston 4.102" Bore Street/Strip

The Wiseco 4102FSX is a high-performance forged flat-top piston designed for serious street and strip automotive applications. Featuring a 4.102-inch bore diameter, this piston is part of Wiseco's renowned Sport Compact and performance automotive piston line, engineered for builders who demand maximum durability and consistent power output.

Wiseco forges their pistons from high-silicon, low-expansion aluminum alloy, delivering superior tensile strength, reduced reciprocating weight, improved heat transfer, and extended service life compared to cast alternatives. Each piston is finish-machined on CNC-controlled turning centers to ensure precise sizing and a consistent, repeatable fit.

Key Features:

• 4.102" bore diameter for precise fitment in compatible engine applications
• Flat-top crown design optimized for street and strip performance builds
• Forged from high-silicon, low-expansion aluminum alloy for superior strength-to-weight ratio
• CNC diamond-turned finish for consistent sizing and minimal variation
• Engineered and manufactured in the USA at Wiseco's Mentor, OH facility
• Built to tight tolerances for reliable, repeatable performance
• Compatible with Wiseco ring sets and wrist pin accessories

Whether you're building a high-output naturally aspirated engine or a boosted street/strip combination, the Wiseco 4102FSX delivers the reliability and precision that Wiseco has been known for over more than 80 years of performance piston manufacturing.