Connecting Rod Bearing Selection: Notes

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 is 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.

Big End Bore Size 

J35Z6 engine: 58.0 mm (2.283 in) 

J37A4 engine: 60.0 mm (2.362 in) 

Inspect the connecting rod for cracks and heat damage.