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Otto Throttle 
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Joined: October-02-2017 Location: Cleveland OH Status: Offline Points: 396 |
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 Topic: Spark Plug SelectionPosted: March-01-2025 at 10:41am |
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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
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TRBenj
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Joined: June-29-2005 Location: NWCT Status: Offline Points: 21197 |
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Posted: March-01-2025 at 3:23pm |
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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.
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Otto Throttle
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Joined: October-02-2017 Location: Cleveland OH Status: Offline Points: 396 |
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Posted: March-01-2025 at 5:54pm |
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Thank you!!!
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Otto
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Jonny Quest
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Joined: August-20-2013 Location: Utah--via Texas Status: Offline Points: 3006 |
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Posted: March-01-2025 at 6:57pm |
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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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KENO
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Joined: June-06-2004 Location: United States Status: Offline Points: 11181 |
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Posted: Yesterday at 5:53pm |
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One thing to keep in mind here is that
A copper plug typically has a nickel center electrode with a small diameter copper wire buried in the middle of the center electrode A platinum plug has that same small diameter copper wire buried in the middle of the platinum coated center electrode An iridium plug has that same small diameter copper wire buried in the middle of the iridium coated center electrode You can't visually look at any spark plug and see any copper. (unless you destroy the plug to get at look at it) And like mentioned earlier, the copper core standard plug will be just fine in your engine Otto And Otto..... you should probably change those plugs a little more often than every 27 years or so.
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