I have 3 connecting rod I obtained in a box of parts. All 3 have the # 473188 GM. one has a 70 (after the GM), one has 29 and one has 73. Can anyone tell me what engine they're for? They don't show in any of my books. Any help is appreciated.

They are for the 33-34 chev standard.
George

Thanks for the help George Are they worth trying to sell? I have a 32.

Very little call for chev standard. I consider anything old is worth trying to sell or give free versus throwing in the scrap pile.