Timing chain drip leg?

Lots of engines get the chain oiled simply by the oil out of the front main bearing, wicking along the crank snout, up the crank sprocket, and onto the chain. The chain and sprockets that came out of our used 273 looked to be fine, and it had neither the drip tab or any hole in the bolt.

FWIW, the best designs I have seen are those that have oil pressure actuated tensioners; the tensioner piston will have a small hole to push oil through a matching hole through the tension block to oil the chain directly.