How Do You Bore An Engine Block?
To bore an engine block, automotive machine shops use special equipment to smooth out the surface of scratched, scored or excessively worn engine cylinders. They actually remove a thin layer of metal to within thousandths of an inch of the piston size that will be used to rebuild the block, says James Duffy in “Modern Automotive Technology.” However, you can proceed with the next step of the process–engine honing–to reach the cylinder’s final size and finish. Mount your clean engine block on a stand or set it securely on a hard top workbench. Turn the engine block upside down and install the main bearing caps, tightening them to the torque specified by your vehicle manufacturer using a torque wrench. This information can be found in the vehicle service manual for your particular model. Attach a flex hone with 133-grit stone to an electric drill. Put on your goggles. Mix equal parts of 20 weight oil and kerosene in a suitable, clean container. Rotate the engine so that you are facing
