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Re: Ford 4.9 (300) spark plug woes
Posted to Technical Discussion Forum on 11/17/2025 7 Replies

Glenn,

That isnt what he needs. The correct spark pug thread size is 18MM x 1.5 The tap that comes in the 18MM Timesert kit is a 20MM x 1.5 tap. I have one right in front of me. He wants to do away with the plug saver so he needs to go back to the original p... Login to read more.

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