What makes the 74 Roadrunner longer than the 73?

[Trench]

I was just looking at the specs and I see that the 73 RR has a length of 210.8" and the 74 has a length of 212.4", a difference of 1.6". Anyone know what made the 74 longer?

 

[burntorng70]

If I had to guess, and I do, I would attribute the growth to the collapsing bumpers that were added to meet new regulations.

 

[WileE]

Just look at the cars, see if you notice the difference. In 1973, the bumper regs mandated 5mph front & 2mph rear. In 1974, the rear increased to the same 5mph.

 

[toolmanmike]

Yes a extra inch of rubber on the bumper guards. If you look close you can tell the difference between the 73 and 74. Same with Challengers and Cudas.

 

[Trench]

Thanks guys, that makes sense. I figured it would be something like that.