Hei Developed In 70
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The High Energy Ignition (HEI) system was developed by Delco Remy in the early '70s and was designed to improve spark intensity and maintain emissions. Pontiac first used HEI on specific applications in 1974, and then on all of its V-8 engines from 1975 forward. Vintage Delco literature states that its large 135mm-diameter cap was required to prevent cross-arcing from the increased spark intensity. View Related Article
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