There are several ways to repair stripped crankshaft harmonic balancer bolt-hole threads on a small-block Chevy.

What happens when a broken bolt or screw extraction turns into threads damaged beyond repair? Damaged threads can sometimes be chased and cleaned up with a thread chaser or tap.

When you are performing thread repair or replacement you have to pay close attention to detail. Make sure you're using the correct-sized drill bit for the stripped out hole.

Thread a needle with strong nylon thread or fishing line. Carefully stitch back and forth across the hole, creating small loops that secure the torn edges together.