Bad GM designs and ideas
FYI, I spun your post off.
These should not necessarily be things that ended up being bad in the long run (i.e. stuff that couldn't hold up past stock) but rather things that sucked from day one.
I'd say the Vega's aluminum block was a rough one. And the '67 f-body rear setup for the big block cars.
I'd say no to the T-5 just because it was OK in a stock 3rd gen app.
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