BBM FHR Forged Piston Set 4.350 Bore -5.6cc

The ICON PISTONS BBM FHR Forged Piston Set 4.350 Bore -5.6cc represents a premium engine component engineered for serious high-performance Mopar RB-Series builders. These forged pistons deliver the strength and precision required for forced-induction applications, street performance builds, and competition engines operating under sustained high-load conditions. The -5.6cc dish geometry is optimized for specific compression ratio targets within the RB displacement family, making this piston set a critical specification for custom engine builders who demand exact bore fit and proven reliability.

The 4.350-inch bore sizing is engineered to match oversized RB-Series blocks, accommodating stroker and big-bore configurations commonly used in heritage Mopar applications. Ring groove dimensions of 5/64 x 5/64 x 3/16 inches conform to standard RB-Series specifications, ensuring compatibility with OEM and performance ring sets designed for this engine platform. Forged construction provides superior strength compared to cast alternatives, critical for engines producing elevated boost pressure, nitrous oxide augmentation, or extended RPM operation. The -5.6cc depression allows engine builders to dial in precise compression ratios when paired with specific head flow characteristics and combustion chamber volumes.

This piston set is engineered for Mopar RB-Series enthusiasts building supercharged, turbocharged, or naturally aspirated performance engines. Engine builders restoring legendary muscle cars, constructing modern pro-street platforms, or competing in bracket racing rely on ICON pistons for consistent bore sizing and material reliability. Whether for a freshly bored block or a stroker assembly, the 4.350-inch forged piston set provides the precision tolerances and strength that separate professional builds from budget components.

ICON PISTONS maintains a strong reputation within the Chrysler performance community, with piston sets engineered to exacting tolerances for RB, big-block, and displacement-specific applications. The -5.6cc compression specification is a technical choice—not a universal fit—requiring engine builders to confirm compression ratio targets against their specific cylinder head, displacement, and intended power level before ordering.