How do you fix a stripped thread on engine block?

To fix a stripped thread on an engine block, you can use a helicoil insert, which involves drilling out the damaged thread to a larger size, tapping it for the helicoil, and then inserting the coil to restore the original thread size. Alternatively, for smaller repairs, you might use thread repair epoxy or a thread repair kit that includes inserts designed for high-stress applications. Ensure the area is clean and free of debris before starting the repair for the best results. Always consult your vehicle's service manual for specific recommendations.