Quick question about atc70 spark plugs

[Cert88]

Do all 70's have the same size spark plug? Im asking this because my one 70 has a larger hole for the spark plug than the other engine, and I dont know what size to get for that one. Or was it drilled out at some point?

Thanks in advance!

[big specht]

It probley was striped out at one time and they just retapped it to the next size I have see this too