What Spark plugs should i run in my 383???
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^^^^ what he said. Gap them to .050 Always check the gaps on all of them, regardless of what they say they come gapped with from the factory.
Those plugs and that gap are perfect for a bone stock engine, all the way up to a fully built 454ci with 650 RWHP.
You have to use different plugs and gaps when you start spraying nitrous or going turbo or super charger.
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