Keith Black Hypereutectic pistons are T-6 heat treated and offer reduced scuffing and improved durability over stock replacement pistons. They also allow you to run tighter clearances because of reduced thermal expansion, which means more race winning power.
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
For Ford 347 c.i. (4.00" bore x 3.40" stroke). Use piston ring Style C (1/16", 1/16", 3/16").
Ring Style Chart (GIF)
474-246 Instructions (PDF)
C/R 64cc: 10.0, C/R 69cc: 9.5
Bore and Stroke: 4.00" x 3.40"
Rod Length: 5.400" Ring Style: C