The Ford Barn

19Fordy · 06-19-2020, 09:26 AM

Google: Spark Plug Reach"Be sure to get a clear understanding of what each plug manufacturer means by the tern "spark plug reach". Definition seems to vary.
For instance, NGK GR4 2635 plug has a 3/4 in. reach. On this plug the 3/4 in. reach is measured from the surface of the body of the plug where the gasket sits to the bottom of the metal housing encapsulating the ceramic tip.

https://www.jegs.com/i/NGK-Spark-Plugs/739/GR4/10002/-1

It's shown on the NGK Long Reach Plug in this link.

http://www.ngk-sparkplugs.jp/english...q13/index.html

06-19-2020, 09:26 AM	#5
19Fordy Senior Member Join Date: May 2010 Location: Coral Springs FL Posts: 11,604	Re: spark plug reach Google: Spark Plug Reach"Be sure to get a clear understanding of what each plug manufacturer means by the tern "spark plug reach". Definition seems to vary. For instance, NGK GR4 2635 plug has a 3/4 in. reach. On this plug the 3/4 in. reach is measured from the surface of the body of the plug where the gasket sits to the bottom of the metal housing encapsulating the ceramic tip. https://www.jegs.com/i/NGK-Spark-Plugs/739/GR4/10002/-1 It's shown on the NGK Long Reach Plug in this link. http://www.ngk-sparkplugs.jp/english...q13/index.html Last edited by 19Fordy; 06-19-2020 at 09:43 AM.