manley thread type

[Paul O' Norton]

Hi all not sure anyone can answer this, I have a Steve Manley stage2 modified head and the 3 3/8 stud hole have been modified to a corse thread pretty sure its a 16tpi but would it be unc or whitworth

 

[Holmeslice]

Hi all not sure anyone can answer this, I have a Steve Manley stage2 modified head and the 3 3/8 stud hole have been modified to a corse thread pretty sure its a 16tpi but would it be unc or whitworth

Maney used 3/8 x 16 UNC (coarse) in the head and cylinder threaded holes

 

[Paul O' Norton]

Thanks for comfirming