Oil Pressure Relief Seat

[Shawn T]

You are correct that a 16 mm (0.6299") end mill would be ideal but my local supplier doesn't have any. They do have a variety of 5/8" (0.625) that are oversized by 0.002-0.004", therefore 0.627"-0.629". The piston measures 0.6245". What do you think?

This piston set is supposed to increase oil pressure by 25%.

Thanks

Shawn T