SB Chev Aluminium Timing Cover Unpolished MI14815SB Chev Aluminium Timing Cover UnpolishedSuit SB Crank With BB Snout & Seal MI14815 14815 Milodon aluminium timing covers feature either a highly polished face or a CNC machined face. Their rigidity offers a positive non flexing cam stop. Milodon aluminium timing covers are designed to fit over stock and double roller timing chains. Also fits under stock short water pump in most cases( some cases will require only minor water pump modification).