Keith Black Hypereutectic pistons are favored for their improved power and reduced scuffing. The unique design & manufacturing processes combine to produce a rigid piston, which will rock less in the bore improving ring seal. These T-5 heat treated pistons also offer reduced thermal expansion, which allows you to run tighter clearances and allows the piston rings to seal better and minimize blow-by. For S/B Fits Chevy 383 c.i. (4.000" bore x 3.75" stroke).390 Hypereutectic alloy Fully machined crowns and valve reliefs Drilled oil drain backs Full floating wrist pins Triple wound spiral locks Reflective alloy allows 2% power increase Quench dome technology minimizes deterioration Zero deck quench designs Lightweight wrist pins Ring Style Chart (GIF)Item DetailsC/R 58cc=11.9, 64cc=10.9, 76cc=9.6Piston/Pin Weight: 650 gRod Length: 5.7", Ring Style: A
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