Oil Pressure Relief Seat

[Shawn T]

I'm replacing the stock bypass/relief pistons with the high pressure ones available from Pelican for type 4 engines.

Looking in the larger bore the seat looks a little rough. Has anyone used a 5/8" X 5/8" 4 flute finishing end mill by hand to clean up the seat? Dimensionionally it works. Probably need a 5/8" drill collar to control depth of cut?

Will the hp pistons, seat cleanup and Schradek 30mm pump be overkill on a mild 2 liter motor?

Thanks

Shawn T