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What is the spark plug gap for a 383 Chevy motor using AC Delco R45S plugs?

Anonymous

∙ 17y ago

Updated: 12/10/2022

Usually about .035" for points-type distributors and .045" for HEI type. A bigger gap is better, but only if the ignition system can handle it.

Also, 45's are a little hot for most performance applications. Try 44's, then 43's, but keep an eye on them for fouling.

Wiki User

∙ 17y ago

What else can I help you with?

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