Koyo Alloy High Performance Radiator - Swift Sport ZC11, ZC21, ZC31SKoyo Alloy High Performance Radiator Swift Sport ZC11, ZC21, ZC31S 36mm Core V SERIES 36mm Core Thickness Designed for applications where engine configuration size cause clearances issues for thicker core radiators. In this case, the 36mm V Core Series will suit your needs. Intended for both circuit and daily use. Unless noted otherwise, all Koyorad V Series All Aluminium Radiators are Nocolok brazed, designed as a factory fit, direct bolt in with no