![How to determine proper spark plug heat range [Datsun 240Z L28 stroker] - YouTube](https://i.ytimg.com/vi/Ehtb5i8wxHQ/maxresdefault.jpg "How to determine proper spark plug heat range [Datsun 240Z L28 stroker] - YouTube")
How to determine proper spark plug heat range [Datsun 240Z L28 stroker] - YouTube
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