Omc 3.0l 1991 prop nut size

[kinggeordie]

Hi, does anyone know the prop nut size for a omc cobra drive 3.0l 1991, looks about 5/8 at the taper. Is it unc or unf?

Cant seem to find one in the UK. Most places are unable to order one.

Thank you

 

[alldodge]

It should be 3/4-16 thread @Scott Danforth

 

[Scott Danforth]

i think they standardized on teh 3/4-16 of the Alpha.