The machining process gets going with the block being bored with a Kwik-Way FL boring bar. An interchangeable carbide bit does the cutting. Six passes and 45 minutes are needed to completely bore each cylinder. After the cutting is complete Pecos measures the bore size with a dial bore gauge to verify the press fit--the hole in the block is 2.5 thousandths smaller than the sleeve, the interference fit is what will hold the sleeve in the block. An incorrect size will cause water leakage issues.