Harmonic Balancer Installation - Tapping threads in the crank
Many of the early Chevy engines do not have a bolt or any threads in the center of the crankshaft. So I bought a kit from Jerry (Hot Rod Lincoln) and cut threads in the center of my 1963 230ci engine crankshaft. A special bolt then threads into the crank so you can press fit the HB onto the crankshaft. It worked great!