A modern and efficient V8 of 4.1 liters, the HT4100 was the exciting way forward for Cadillac's propulsion needs in the early Eighties. The engine came hot on the tail of a very iffy cylinder deactivation experiment, V8-6-4. Unfortunately, just like the cylinder games before and the Northstar after, the HT was plagued with issues that took years to iron out. The HT in its name meant High Technology, but could've meant Halfway There. Let's travel back to the Seventies and talk cylinders.