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Normally when spark plug threads are damaged, you can not just clean the thread and start again. The tap is a std size, available from any good automotive supplier. The chances are though you will need to use an over size tap, and locktite in a helicoil to the right size. These helicoil kits are available from good auto suppliers, normally in a range of over sizes. you must get all the swaging out of the motor before starting it. magnet if steel, modified vacuum cleaner. not a quick or easy job when the motor is together.

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14y ago
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Q: What size tap is needed for 1992 ford f150 spark plug hole?
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