Sierra 18-5486-2 Electronic DistributorSierra replacement Electronic Distributor for Chevrolet L4, 153 & 181 CID engines. This distributor has been manufactured for improved performance and combustion efficiency. Additionally, this part is easy to install and is designed to require less maintenance than competitors.Features: For Chevrolet L4, 153 & 181 CID; Conventional rotation; Improved spark plug life; Accurate spark timing; Designed for 12 volt negative ground systems; Includes: (1) 18-5397 Distributor Cap; (1) 18-5488 Ignition Module; (1) 18-5404-1 Rotor; Interchangeable with: Mallory; 9-26308; YLM673AV;