In those days people probably didn't know better. I will give you that. The standards were appreciably lower as a result.
But to say that the quality only went down in the 70s is really a misnomer. The quality really never improved much after the 50s. When the war ended, cars were still mostly body on frame. I can excuse that for most of the 50s. But by the 60s the Germans had already started to use monocoques and go away from the frame and body design. The reason was simple; stiffer, better handling, better crash protection etc. Meanwhile here in the states the big 3 continued to do what they always did; reskin the car, maybe change the bumpers and send it out basically unchanged. Every year brought new changes, but nothing substantial. While the Germans and Japanese, whose industry was decimated by the war, made leaps and bounds.
Hang on, You're saying that the U.S. hadn't adopted unibodies by then? What a misnomer: by 1970, Chrysler had them across the lineup, and GM and Ford had them for everything except the full-size cars. GM Adopted unibody construction in the early '60s with the compact lineup...they also had rope-shaft driveshafts in Pontiacs and Buicks for a flat floor, and the Tempest had Independent rear suspension. They got rid of these, because people wouldn't buy them strictly because of this. They didn't care about a flat floor or IRS in those days.
And then there was the Corvair. Wasn't appreciably less safe than any other Six-Cylinder, Rear-Engined car. G.M. tried to innovate and got chopped down by an overzealous lawyer who still wants to be president.
Be that as it may, in the 50s most cars were a chassis with a body bolted on top. Quite a few American cars were still made this way in the 90s, and I cant think of a single European car that was.
Name three. Three '90s, body-on-frame passenger cars from American Manufacturers. No SUVs or Trucks.
In the 50s most cars were rear wheel drive. The big three were behind the ball again when there was a almost universal switch to FWD by the industry. Starting in the 70s with the gas crunch and the switch to smaller cars.
Overhead cam engines? More power per cubic inch meant smaller engines could drive bigger cars. Which meant better fuel economy.
And while we are talking about fuel economy, overdriven transmission ratios? Multiple gears to keep the engine in its power band. GM and Ford have only just started using a 6 speed transmission they co developed in pretty much all their cars. Sure the Vette had one, but how many vettes did they sell compared to the malibu?
RWD to FWD? The Europeans stayed with RWD longer than anyone else. Especially BMW. It's probably VW's Rabbit and Honda's CVCC cars that got the big three developing FWD platforms, but these showed up, with a vengance, in the late '70s and early '80s, starting with the Omni/Horizon...and then we got ahead, by introducing the K-car, a FWD MIDSIZE! Euro manufacturers didn't have these, other than VW/Audi. Ford Europe's next in this size class, in fact, was the RWD Sierra.
I'll admit, the reason OHC engines weren't developed in the U.S. was likely that U.S. auto racing regulations outlawed them, or didnt' provide space. Ford's 427 Cammer being the primary reason. Also had Pontiac's OHC6, which couldn't make the power of big V8s in Pontiac's lineup: which, by the way, were developed independently of other G.M. divisions
and overdrives? You say this as if the Europeans and Japanese had enough power to make use of them. Fact was, we had overdrive trannies in the '50s, and people stopped buying them because they didn't accelerate as quickly. then the gas crunch hit, the manufacturers had to put them in again, or use super-tall final drives. Furthermore, Six-speeds are a recent innovation...there weren't any road vehicles other than heavy trucks available with more than five until the '80s. Save for, perhaps, some obscure auto they made something like 1,000 of.
It boils down to being cheap, in order to make profits IMO. The tech and knowledge was always there. The desire was there, but never the execution.
And Toyota is right now finding out that that is not how to make your cars
Maybe. but you're still using the wrong argument if you're using the GTO.
Actually, I'm gonna make an assertion here. It's not Lazy engineering, it's
RUSHED engineering that caused the American manufacturers to lose their foothold.
I say this because of two small cars rushed to market: the Pinto and Vega. The Pinto had the advantage of using an engine developed with the European arm, and in fact the little Pinto engine eventually became the turbo monsters used in the Sierra Cosworth, the RS200, and the Escort Cosworth. But the chassis was the problem; specifically, a poorly thought-out filler neck that could easily break and cause a fire, causing another rout of consumer pundit bashing.
The VEGA was even WORSE. GM was so intent on getting this car to market that they were HORRIBLY built. the all new all-aluminum engine...including the cylinder sleeves...lasted about a year before it threw up all of it's oil. sometimes less. As well, the cars used poor-quality steel (here's probably a true example of being "cheap") and rusted almost as soon as it went off the lot. especially if it was winter.
You keep quoting BMW, but their prices then and now were so high, and their dealer network so thin, that it was irrelevant. You want the big killers? Honda, Toyota, Datsun, and VW. The latter of which was using a car developed originally in the '30s, until the very end of the '70s, when they introduced their Golf as the Rabbit to the U.S. The reason these are more representative than BMW? Simple. Price. You could get a Japanese car or Beetle very inexpensively. BMW, at the time, was a premium brand, like they are now. They catered to upper-middle-class "sports car enthusiasts."