The JUN Custom kit is composed of a long stroke crankshaft and JUN Super Forged aluminum pistons. The JUN Stroker kit provides more power and torque capabilities of your Stroker Assemblies - Includes JUN Full Crankshaft, JUN Super Pistons and JUN Super Connecting rods. The lightweight, high strength, and rate of balance of those parts are improving. The high response is offered. You can use broadly in various fields as circuit running, drag race etc.