Connecting Rod Bearing Selection: Notes
WARNING: This page is about a different car, the 2008 Acura TL and 2007 Acura TL. However, it is still accessible from the selected car via links, so may be relevant.
Each connecting rod falls into one of four tolerance ranges from 0 to 0.024 mm (0.0009 in.), in 0.006 mm (0.0002 in.) increments, depending on the size of its big end bore.
It's then stamped with a number or bar (1, 2, 3, or 4/ I, II, III, or IIII) indicating the range. You may find any combination of 1, 2, 3, or 4/ I, II, III, or IIII in any engine.