AcDelco GM Distributor Cap (D329A) And Rotor (D465) Kit Vortec-8 Manufactured to GM OE specification for fit, form, and function, offering the quality, reliability, and durability of GM OE GM-recommended replacement part for your GM vehicle's original factory component Undergo stringent testing, often under extreme or unusual conditions, to deliver the quality parts you expect from ACDelco Equipped with a full anti-arc barrier to reduce the possibility of secondary voltage arcs that can cause an engine to misfire Have metal inserts designed to provide the best possible fit to ensure maximum conductivity between the distributor towers and spark plug wire