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Posted on Jan 02, 2017
SOURCE: 383 SMALL BLOCK CHEVY
383 is a modified engine...since it's not stock, you need to learn to "read" spark plugs. In reality the # used in any engine is a starting point for experimentation. Begin with factory plug, If too white or too black change heat range 'till you find a # that gives mostly white porcelan with light tan tinge. That will be a good plug to run.
Posted on Mar 25, 2009
The spark plug gap is usually on a sticker under the hood or in the owners manual. It is usually in the range of 0.045 to 0.060. Don't believe the guy at the parts store when he says the plugs are pre-gapped.
Posted on Sep 15, 2009
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