SBC FHR F/T Piston Set 4.155 Bore -3.7cc

The ICON PISTONS SBC FHR F/T Piston Set 4.155 Bore -3.7cc is a forged piston assembly engineered for small block Chevy engines requiring tight bore tolerances and precise compression control. This complete eight-piston set delivers the forged strength and dimensional accuracy that high-performance and street engine builders demand when balancing power output with fuel economy and engine longevity.

Each piston in this set features forged construction for superior impact resistance and heat cycling durability compared to cast alternatives. The 4.155-inch bore specification matches modern small block Chevy platforms requiring tight tolerances, while the -3.7 cubic centimeter compression cavity reduces combustion chamber volume to raise the engine's static compression ratio—a critical tuning parameter for carbureted engines and naturally aspirated builds targeting improved throttle response and peak horsepower. Ring groove dimensions of 5/64 x 5/64 x 3/16 inches ensure proper ring sealing and blow-by control across a wide RPM range. The complete set of eight eliminates guesswork about piston matching and simplifies the rebuild process.

This piston set suits engine builders restoring original small block Chevy platforms or upgrading existing cores with modern forged internals. Compression ratio optimization is essential for carburetor tuning and for engines running premium fuel without detonation risk. The SBC FHR F/T configuration is widely recognized in the racing and restoration communities for delivering consistent bore fit and reliable compression stability through thousands of heat cycles.

Small block Chevy engines remain one of the most versatile platforms in automotive performance, and piston selection directly impacts efficiency and durability. Forged pistons from established manufacturers like ICON reduce the risk of catastrophic failure under sustained high-load conditions. This set provides the precision bore fit and verified compression control that serious builders and shop technicians expect when specifying internals for any engine application demanding reliability and measurable performance gains.