Chevy Vega / Porsche 928
Seems an odd combination of cars huh.
The similarity is the casting technology used to make the engine block for each cars engine.
Yup, unlined Aluminum bores.
Porsche developed the casting technology for the 928 V8 engine. I don't recall the name of the technology presently.
The Porsche motors basically have glass like cylinder bores that do not wear, thanks to the Silicon in the casting technology.
GM licensed the casting technology from Porsche. GM took shortcuts and we got the Vega, likely the worst engine that Detroit ever produced.
The fatal flaw were the shortcuts GM took in production, mainly focused on time.
The technology was not flawed, the execution of it was.