1973 360

junkyardhero said

do you have a source on this?

the reason i'm asking is that it's common knowledge that the later cars were heavier than the earlier stuff. so i'm kinda wondering how say a 74 dart sport with a 360 would be faster than 72 340 dart when it weighs 5~700lb more.

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They didn't weigh as much as a new Challenger. The '74 with a shock mount bumper was certainly heavier than a '72, but not by that much. The only other thing I can think of that added weight were door bars. Maybe 100#, at most? And the later '74 Duster 360's didn't even have the shock mount bumpers.