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Old 08-04-2014, 09:50 AM
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Doc, it depends on plug and head design. There are "one piece" plugs that you can buy for these engines that will not be prone to breaking like the "two piece" factory plugs.

Here are "two piece" factory plugs with the sleeve that seizes to the head, you can see how it breaks off:


Here's a "one piece" that does not have the sleeve:
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