8n spark plug hole

koenton · Nov 10, 2016

Can anyone tell me what size the spark plug threads are in 8n ford tractor head and where I might get a tap.
Thanks everyone

Del Huebner · Nov 10, 2016

Its 14mm.

Den N Ms · Nov 10, 2016

Koenton,It is 14 mm - 1.25 mm thread You can find a tap at your local NAPA.
Tap Thread Plug / Metric

Tim PloughNman Daley RIP · Nov 11, 2016

Yep, the size is 14mm x 1.25mm (pitch). Be sure you don't get a 1.5mm thread pitch or you will booger up the threads for good. You can buy a tap at any tooling supply house -MSC, Carr-Lane, McMasters, Graingers, et al. You may have to order one, but not that cheap.

Tim

8n spark plug hole

koenton

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Del Huebner

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Den N Ms

Well-known Member

Tim PloughNman Daley RIP

Well-known Member

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