Speedmaster PCE305.1005.04 Flat Top Hyper Pistons 4.040" for SBC 383 6.0" Rod

Chevy SBC 383 ci 6.0" 4.040" 1.100" 0.927" Flat Top Hyper Pistons Coated Hypereutectic pistons with anti-friction skirt coating are manufactured from a aluminum alloy which contains 16 percent silicon for greater strength and wear resistance. By combining the hypereutectic alloy with the permanent mold process, the piston is strong, lightweight, and thermally-efficient. These pistons run tighter piston-to-wall clearances, improving ring seal and longevity. They are ideal for street, bracket racers and oval track. By combining the hypereutectic alloy with the permanent mold process, the piston is strong, lightweight, and thermally-efficient These pistons run tighter piston-to-wall clearances, improving ring seal and longevity