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KB Performance Hypereutectic Piston Set

Item #: UEMKB162

Price: $484.99



Fits: Mopar Big Block B

Eng. Disp. In. 383

Eng. Disp Liters 6.3

Year Range 1931-1973

Bore (in) 4.25

Bore (mm) 108

Stroke (in) 3.38

Stroke (mm) 85.9

Oversized Yes

Ring Pack 5/64, 5/64, 3/16

Top Land .275

Pin Number 1.094x300K

Pin Type Press or Floating

Pin Diameter (in) 1.094

Pin Diameter (mm) 27.8

Lock PRF116-3

Compression Height IN 1.908

Compression Height MM 48.5

Crown (cc) +8cc

Alloy 390

Compression Ratio 72-9.8, 80-9.1, 84-8.8, 88-8.5

KB Performance hypereutectic pistons are made from 390 aluminum alloy and heat-treated to T6 standards, which makes them 30 percent stronger than ordinary untreated hypereutectics. Their 100 percent CNC-machined crowns, high upper compression-ring location, gas-accumulator groove, drilled oil returns, and spiral-lock retainer grooves make these pistons outstanding for performance applications. They have a lightweight, rigid-rib skirt design that stabilizes the piston in the bore. All of this adds up to pistons that fit tighter than forged types, provide improved oil control, reduce blow-by, increase ring life, eliminate cold start-up knocking, and won't cost you an arm and a leg! Thousands of models are available—find the set and options designed for your vehicle and engine application.