All components for Scat's Rotating Assemblies, are designed for the ultimate in performance. It takes the ''guess work'' out of engine assemblies. The choice of components are selected to ensure we meet the needs of you, our customer. Whether it is street, strip or circle track, Scat will design the ultimate rotating assembly and make sure it is precision balanced.Kits include 4340 forged crankshaft, 4340 forged H beam connecting rods, JE or SRP pistons, ring set(Plasma ductile iron top, reverse twist 2nd ring and standard tension oil ring) & Clevite 77 bearings.