The solid pilot design does not cut the minor-thread diameter.
This port is also called the O-Ring Boss or ORB, SAEJ1926-1, SAEJ514 or just SAE (dash number).
Product Information
AN818 Port Contour Tool
AND10050 Reamer Pilot Port Tool Carbide Tipped
AND10050-S Port Cutters Carbide Tipped
AS5202 - Port Cutter Tool - Reamer Pilot - also for MS33649
AS5202 - Port Cutter Tool - Solid Pilot - Carbide Tipped - also for MS33649