BBC FHR Dome Piston Set 4.125 Bore +17cc

The BBC FHR Dome Piston Set 4.125 Bore +17cc from ICON PISTONS is a premium forged piston package engineered for Big Block Chevy engines demanding elevated compression and enhanced combustion efficiency. This eight-piece set is designed for serious engine builders and performance enthusiasts who require pistons that combine durability with precision-engineered geometry. The dome design increases combustion chamber volume and compression ratio, making these pistons ideal for high-performance street and racing applications where superior strength and reliability are non-negotiable.

Forged construction ensures these pistons withstand extreme cylinder pressures and thermal stress that cast alternatives cannot match. The 4.125-inch bore diameter fits a wide range of BBC applications, while the precisely machined ring grooves—5/64 inch × 5/64 inch × 3/16 inch—accommodate standard ring packages for optimal sealing and blowby control. The +17cc dome adds 17 cubic centimeters of volume per piston, effectively raising compression ratio and promoting faster, more complete fuel combustion. This geometry is critical for tuned engines where every fraction of a point in compression ratio impacts horsepower and torque output. The forged steel construction resists detonation and offers superior heat dissipation compared to hypereutectic or cast alternatives.

This piston set is best suited for builders assembling modified BBC engines for drag racing, street performance, or marine applications where maximum efficiency and reliability matter. Installation requires proper honing to specification and careful ring gap measurement to prevent binding. The set contains eight pistons—one for each cylinder in a standard Big Block Chevy configuration—ensuring uniform performance across all cylinders. Compatibility extends to most BBC platforms from 1965 onward, provided block bore has been properly sized to 4.125 inches. Professional installation by an experienced engine builder is recommended to achieve optimal results and longevity.