Does a 318 and a 340 have any common parts?

pagilman said
:read2:Here's a question for you guys? Is the forged cranK in the 273's the identical crank in the early 340's? Did all 273's have a forged crank?

No, because of the weight of the pistons/rods. They weigh more in a 340 than in a 273, so the crank counterweights are different