Completed connecting rods after machining have no sharp inside corners anywhere. The wrist pin hole has one oil slot & the crank pin hole has two oil slots. All oil slots are .032 wide. The two slots in the bottom are staggered to each side of the visible undercut. The inside corners of the undercut have a radius also. This undercut lightens the bottom end & forces oil into the connecting rod as it rotates in a groove machined into the crankcase. All connecting rods are guided in the upper end, between the piston bosses (.005 in clearance), where the rotational speed of the wrist pin is low. Connecting rods should NEVER be guided in the bottom end where the rotational speeds of the crankshaft are high.
