When Cadillac’s terrible 4-6-8 engine was replaced by a worse HT4100 V8

When a company tells you that its latest development is ‘high-tech’, it means it uses the latest technology. Especially in the late 1970s, when Cadillac told you, it was, especially in those days of loyal brand loyalty. After the hot mess that was the 4-6-8 V8, and the Oldsmobile diesel disaster, GM needed a home run with its latest powerplant, the “HT4100” V8. But doomed by GM hubris and repeating some of the same mistakes that happened with the 4-6-8, the HT4100 helped nail Cadillac’s coffin for decades.

When did the Cadillac HT4100 debut?

1982 Cadillac Brougham | GM

To refresh, Cadillac debuted its new 4-6-8 V8 with the first computer-controlled cylinder shutdown in 1981. While it was a brilliant idea, computer technology couldn’t keep up with the demands of the engine. It was so bad that the automaker dropped it at the end of the year.

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