You have to keep in mind that that it isn't just the bumpers, its also the 2 shock absorbers that each weigh about 8lbs, all the extra mounting hardware, the brackets, the changes to the frame to fit all the parts, the bumper fillers and attaching hardware to make the car look somewhat better. Otherwise the cars would look like some of the AMC products of the era that have the bumpers just jutting out from the body. Just look at pictures of 74-76 AMC's to see what I mean. I can see an extra 200lbs for the 1973 model year, and 300lbs for the 74-77 model years. I don't know how much they had to strengthen the frame to meet the crash standards, of if they had to increase the gauge of metal.
Then you consider that most cars made in 1973 had A/C, power steering, power brakes and the increase in size of the cars themselves, I have no problem with the average 1973 car being 300-400 lbs heavier than the average 1972 car of the same model.
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Jeff R
60 Jaguar Mark 2, 3.8L Automatic
67 Sprint Firebird 230 OHC-6 4-Speed A/C
1971 Fiat 130 Coupe 3.2L SOHC V6, ZF 5-speed
78 Catlina Safari, Pontiac 400 powered
77 Astre Formula, 215 Buick V-8 T-5
73 Lemans Safari, 400 4bbl 4-speed
71 Catalina Enforcer, 455 4bbl
05 Dodge Magnum 3.5L SOHC V6
06 Mallet Solstice #024 LS2, Now with a Tremec 6060 6-speed!
2012 F-150 Echo Boost (My local Ford Dealer SUX!!!)
2020 Dodge Charger Scat pack (recovered)
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