Model A Head Stud Drill Out Kit
Used to drill out broken cylinder head bolts on engines using the cylinder head and special drill bushing as a drill guide. Directions: With the cylinder head on the engine and all other cylinder head bolts tightened, insert the special drill bushing and use the special size drill bit to drill out broken head bolt. After the head bolt has been drilled through, remove the cylinder head and clean the head bolt threads in the cylinder block with a standard 7/16-14 tap (not included). Use compressed air to blow out the tapped hole to remove any debris.