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Spark Plug Selection

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=51877
Printed Date: March-02-2025 at 3:45pm


Topic: Spark Plug Selection
Posted By: Otto Throttle
Subject: Spark Plug Selection
Date Posted: March-01-2025 at 10:41am
Ok I don't mean to "Spark" any controversy but here goes....

Spark Plugs...Mine HO, 285 HP,  Carbureted (GT40 Heads)  calls for the WL764s.  I have seed both the standard, copper, and platinum electrode versions....I am still running the factory original plugs, but I want a spare set...just in case.  What brand and electrode are you running out there!


Thanks in advance!

Otto


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Otto


Replies:
Posted By: TRBenj
Date Posted: March-01-2025 at 3:23pm
Standard is copper and the best conductor- should offer the best performance and lowest price. The advantage of the platinum and iridium tips are longevity, you’re usually best served running the copper and replacing them more often.

Posted By: Otto Throttle
Date Posted: March-01-2025 at 5:54pm
Thank you!!!

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Otto

Posted By: Jonny Quest
Date Posted: March-01-2025 at 6:57pm
Some have indicated that the Autolite 764 is discontinued.  They can still be found, especially on the internet.

The Autolite 104 is the replacement plug for the 764 and is basically the same plug -- 104 has full threads on the body and the 764 is threaded halfway.  Either will work.  (GT-40 or GT-40P heads)

JQ


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