The hole in the rod is the "spit hole" that lubes the cylinder wall every time it aligns with the drilled passageway in the crankshaft. Chevy insert bearing rods, either 235 or 261, simply do not have anti-rotation dowels. There are tabs at the parting line of the rod and cap, for both top and bottom bearing shells. A properly-reconditioned rod doesn't need a tab to prevent the bearing shell from rotating- - - -there's enough "crush" to keep the bearing from moving.
Jerry
