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Old 07-29-2018, 02:34 PM   #5
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Join Date: Sep 2015
Location: Sonoma County California
Posts: 83
Re: What's the correct Spark Plugs?

Originally Posted by Wrenchbender Ret View Post
The S type plugs (extended tip) came out in the 60,s & were an improvement over the regular plugs. Before long all the manufacturers switched to them. They actually run cooler then the old style plugs. The spark is closer in to the combustion chamber for faster combustion. It is best to use the S type like R43S or R44S. If an engine has the tapered seat use R44TS. The extended tip plugs cannot be used in flat head engines.
Wow, the "S" type plugs actually run cooler? That longer plug really helps run cooler so I wouldn't have to use a hotter plug?
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