GM LS F/T Piston Set w/Rings 3.905 Bore

The BULLET PISTONS GM LS F/T Piston Set with Rings (3.905 Bore) is a forged piston kit engineered for GM LS-series engine builders and performance rebuilds. This complete piston and ring set delivers the precision and durability required for high-performance LS engine applications, whether you're assembling a street engine, weekend warrior, or competition-spec build.

The 3.905-inch bore specification fits standard LS-series engine blocks and pairs with ring groove dimensions of 1.5 x 1.5 x 3 mm. The minus 2.70 cc compression cavity allows builders to fine-tune compression ratio during assembly, a critical consideration for fuel compatibility and detonation management across different fuel grades and boost levels. Forged construction provides superior strength compared to cast alternatives, essential for handling peak cylinder pressures in boosted, nitrous, or high-RPM applications.

This piston set is ideal for LS engine rebuilds where OEM replacement or performance upgrades are required. The kit includes all pistons and rings needed for a complete cylinder set, simplifying sourcing and ensuring matched components throughout the engine. Builders working on fuel-injected LS engines in trucks, sports cars, and performance platforms rely on this type of quality forged piston kit to achieve reliable power and consistent durability.

BULLET PISTONS maintains tight tolerances on forged piston sets to ensure proper fitment and ring sealing. When sourcing an LS F/T piston set with rings in 3.905 bore, verify that your intended application matches the compression cavity and ring groove profile, as these determine final compression ratio and ring performance characteristics.