LS FT Piston Set 3.800 Bore

The LS FT Piston Set 3.800 Bore by Diamond Racing Products delivers precision-engineered pistons built for high-performance LS engine builds where reliability and repeatability matter. This complete piston set is engineered for serious LS platform enthusiasts and shops tackling naturally aspirated or forced induction builds requiring tight tolerances and consistent ring seal. Whether you're rebuilding a street engine or preparing a race-ready power plant, Diamond Racing's reputation for manufacturing excellence makes this piston set a trusted choice for builders who demand race-quality components at production efficiency.

Diamond Racing pistons are forged from premium aluminum alloy and precision-manufactured to exacting specifications that ensure proper fitment in your 3.800-inch bore LS block. The FT (Flat Top) crown design minimizes chamber turbulence and maximizes combustion efficiency while providing straightforward installation geometry that simplifies ring selection and clearance planning. Each piston in this set undergoes rigorous quality control, delivering uniform weight distribution across all cylinders—critical for balancing crankshafts and reducing vibration in high-RPM applications. The 3.800 bore specification integrates seamlessly with standard LS stroker and overbore combinations, supporting both stock and custom rod-to-stroke ratios.

Professional engine builders, machine shops, and weekend warriors upgrading tired LS cores benefit most from this complete piston set, which eliminates the guesswork of sourcing individual components across multiple vendors. Installation requires precision boring and honing to your specified clearance; most builders plan 0.0045–0.0055 inch clearance depending on intended duty cycle and boost levels. The set's 18-pound total weight reflects the complete assembly ready for your build, and compatibility spans LS1, LS2, LS3, LS6, and LS9 blocks with proper deck height and rod length confirmation. Pair with corresponding ring sets, pins, and clips from Diamond Racing or your preferred OEM supplier for turnkey piston kit assembly.