All Day Dan

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I need a 5/8 inch spark plug with a washer mount. All the ones I have found so are for a tapered seat. The depth of penetration from the washer to the end of the electrode is 1/2 inch. And yes, a resistive element is also required. Is there such a spark plug? Dan.

Tired Old Man

My Feedback: (1)

This might help

All Day Dan

My Feedback: (5)

Thank you. The chart is a good place to start. Dan.

Tired Old Man

My Feedback: (1)

Google a couple of spark plug manufacturers to obtain some of their plug charts. Champion and NGK are the first places I'd look, with NGK being the better plug. Bosch would be another source.

All Day Dan

My Feedback: (5)

OK. I'll give it a try. Dan.