273 & 318 Connecting rod weights

MObarracuda said

They happen to be the same casting number 2706782...not the best pictures. Would you say it's mutually exclusive when they stopped using the lighter connecting rods and when the compression ratio was lowered from 9.2 (per alpar) to 8.6 in the early 70's?

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Ok, my old eyes thought one was different. I am not certain there was a set in stone date for going to the bigger rids.

Sorta like everybody says the 340 for 1972 had a cast crank, when clearly there were both steel and cast. I think they used parts up as needed.

I do have two nice sets of the smaller lighter rods. Mopar Performance offered them for a time in match weighted sets with good rod bolts. They are still fairly sought after in some racing circles requiring stock rods, as they are much lighter than the later 340-360 style rod.

They were proven to be just as strong, too. Although that argument will rage on forever just like everything else.