PRODUCT DESCRIPTION
Fits: Mopar Hemi (early)
Eng. Disp. In. 426
Eng. Disp Liters 7.0
Year Range 1963-1974
Bore (in) 4.25
Bore (mm) 108
Stroke (in) 3.75
Stroke (mm) 95.3
Oversized Yes
Ring Pack 5/64, 5/64, 3/16
Top Land .437
Pin Number 1.031x300K
Pin Type Press or Floating
Pin Diameter (in) 1.03
Pin Diameter (mm) 26.2
Lock PRH113-3
Compression Height IN 1.949
Compression Height MM 49.5
Crown (cc) -80cc
Alloy 390
Compression Ratio 168-9.6, 174-9.2
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.
