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Spark plugs

Ayuh,..... Depends,.....

With AC Delco, for the Chevy motors, the auto plug is R43T, a steel bodied plug,....

The Marine version is MR43T, an alloy bodied plug, much less prone to Rust,....
 
And less prone to meld with a cast aluminum head. However, it's still a good practice to pull the plugs and inspect every season. Then when you re-install put a light coat of high-temp grease on the threads.
 
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