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18mm Spark Plug Recommendation Printed From: CorrectCraftFan.com Category: Repairs and Maintenance Forum Name: Engine Repair Forum Discription: Engine problems and solutions URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=33810 Printed Date: October-03-2024 at 10:19pm Topic: 18mm Spark Plug Recommendation Posted By: delovett Subject: 18mm Spark Plug Recommendation Date Posted: June-09-2014 at 11:01am Looking to replace my plugs on the '73 351. Had planned on going with the autolite 24s, but my heads take an 18mm. Boat currently sports some NGK WR5s. Any suggestions for an 18mm plug that I should use? Derek ------------- 1973 Nautique 351 Replies: Posted By: phatsat67 Date Posted: June-09-2014 at 11:18am Autolite 124s are the equivalent of the 24 in a 18MM thread size. ------------- Posted By: TRBenj Date Posted: June-09-2014 at 12:19pm Like zach said, 124's work well. So do the 45's. Posted By: delovett Date Posted: June-09-2014 at 12:37pm That was fast! Thanks everyone! ------------- 1973 Nautique 351

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