KB PERFORMANCE Piston Kit - Evolution KB305.020

KB Performance pistons are engineered for racers and serious builders who demand precision and durability under extreme conditions. The tight tolerances and superior heat treatment of these 390 hypereutectic aluminum pistons minimize rock and maximize ring seal, translating directly to better combustion efficiency and longer engine life. Whether you're rebuilding a street engine or preparing for competition, this kit delivers the consistency and performance that separates quality builds from the rest.

• Material: T-5 heat-treated, 390 hypereutectic aluminum
• Weight tolerance: ±1 gram
• Dimensional tolerance: ±0.0005 inches
• Diamond-machined for precision
• Tighter fit than standard pistons
• Reduced piston rock
• Superior ring seal performance
• Includes: 2 pistons, pins, spiral-lock clips
• Hastings moly rings included
• Available separately: Replacement rings, pin clips
• Installation: Professional setup recommended
• Requires precise ring gap clearance
• Requires precise top ring gap
• MPN: KB305.020