10. Cylinder Honing - Most machinist shops will bore the cylinders to within 0.004 or 0.005 of the final bore size to account for the material that honing will remove. “Ring and boring technology has improved a great deal in the past few years,” Chris Bennett of the School of Automotive Machinists told us. “Cylinder walls can be slicker, and modern 1mm rings can be used even in vintage engines.” The ring pack needs to be decided upon before the machine shop performs the honing so that the machine shop can tailor the grit of the stone to the proper bore surface finish. This is imperative if the rings are going to seat properly.