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KB Performance Hyper piston and ring kits are offered for a wide range of applications from street and towing to marine and race. The kits feature pistons cast from 390 hypereutectic alloy heat-treated to T-6 standards to make them stronger. The pistons also feature fully machined crowns and valve pockets. KB hypereutectic pistons come in several head designs, as well as standard and oversized bore sizes. All KB Hyper pistons are lightweight to improve throttle response and rpm changes, while still being strong enough to withstand high compression and high temperatures. KB Performance Hyper kits (KT) are completed with piston ring sets containing top rings of moly-coated cast iron (M) or ductile iron (D)

Piston Rings Included:  Yes
Bore (in.):  3.970 in.
Bore (mm):  100.838mm
Stroke:  3.310 in.
Rod Length:  6.123 in.
Piston Style:  Flat top, with two valve reliefs
Piston Material:  Hypereutectic aluminum
Compression Height (in.):  1.810 in.
Piston Head Volume (cc):  +5.00cc
Wrist Pin Style:  Press-fit or floating
Wrist Pin Retainers Included:  Yes
Wrist Pin Included:  Yes
Pin Diameter (in.):  0.984 in.
Piston Ring Thickness:  5/64 in. x 5/64 in. x 3/16 in.
File Fit:  No
Gapless:  No
Top Ring Thickness:  5/64 in.
Top Ring Material:  Iron
Top Ring Facing Material:  Moly
Second Ring Thickness:  5/64 in.
Second Ring Material:  Iron
Second Ring Facing Material:  Cast iron
Oil Ring Thickness:  3/16 in.
Oil Ring Material: Stainless steel
Oil Ring Tension:  Standard
Quantity:  Sold as a kit.