Bulletin No. 1.60-1 Group No. 1.60 December 10, 1998 Page 1 of 1

HONABLE / BORABLE CONNECTING ROD BUSHINGS

Connecting rod bushings will distort slightly when pressed into the small end bore of the connecting rod. Therefore, connecting rod bushings must be sized after being pressed into the rod by using one of two methods depending on the shop equipment available.

The difference between honable and borable connecting rod bushings is the size of the inside diameter. Borable bushings are approximately .020” smaller inside. This extra material allows the properly equipped machine shop to bore the bushings “on center”, thus restoring the connecting rod to it’s proper center to center length.

Honable bushings have a few thousandths of an inch of extra material on the I.D., and must be honed out after the bushing is pressed into the rod. These honable bushings are a great alternative for smaller machine shops and independent mechanics not equipped to bore the rods.