Tall LS Valve Covers Polished Tall LS Valve Covers W/ Coil Mounting Posts, Cast Aluminum Polished Finish HolleyHolley's tall Ls valve covers are the latest addition to our extensive line of Ls engine components that will add a custom touch to your engine bay and help you to stand out from the crowd. These valve covers were designed to add an additional 0. 54 inch of internal clearance over factory height valve covers. These valve covers retain Holley's signature integrated angled coil mounts, and the hi tech look and performance of coil on cover applications.