I have a 1967 273 and 1968 318 that I just disassembled. They both appeared to be stock. I put the connecting rods on the scale to see if there were any difference. I found it interesting that the assembled weigh between the 273 and 318 were almost the same and the wrist pins were sized to make up the difference in the pistons.
273 connecting rod.....723g
318 connecting rod.....726g
273 piston connecting rod and wrist pin....1576g
318 piston connecting rod and wrist pin....1572g
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