Engine Cold Crack Repair, Drill size (inches): #30 and 51/64

G-Oversize HSS Tapered Tap. High-speed steel tap for installing “GO” series ductile iron plugs in GM/Detroit Diesel 71 & 92 engines and other casting repair applications.

GO-4 sized Iron Plug with Drilled hole.

Repair cracks in cast metal components with TPD Tapered Threadless Pins. Smaller (0.100” small end) than TBA or TPC pins, these are ideal for cold casting repair in tight spaces, providing a strong, durable, and stress-free solution without welding. Also used to prevent spun bearings in high-performance applications. 15/16” length.