Designed for a 5.400-inch rod and standard to 0.060 over sizes, these pistons feature advanced structural internal design, hot spot attenuators at valve relief limits, 3-way pin oiling and temperature suppressing radius at the valve relief intersection. Forged with 2618 alloy and diamond machined, these pistons have modified anti-detonation grooves and an accumulator groove, that is a recognizable design element of all KB pistons. Call 1-800-648-7970 today for more information or check KB out on the web at http://www.kb-silvolite.com.